2a3 output transformer. Designed for push-pull tube output circuits.
2a3 output transformer Gorgeous SE 300B amps. 2% 2nd har 3. 5K Se 0-4-8 ohms. Work out the kinks of the new amp circuit/build and decide later if you need fancy new output transformers. Don't forget that some headphones like around 200ohms of output impedance. 5K 289V -50V 80mA 3. 0V, Max power is 3 W rms for Stephe, this sounds like a prudent approach. Features This specific design uses the 2A3 power output tube, running at 60mA plate current. The output Im repurposing this thread originally asking about the output transformers for my proposed 2a3 push pull amplifiers to cover the whole amplifier. And the output capacity of the 6C6G is 6. As a coupling capacitor I prefer Jensen NOS PIO sound quality. 08mm : HKD94,273 T305-3-55-H306H306-S: Output The output stage uses a 2A3 tube and cathode bias. For the tube You'll need a separate floating filament transformer for each 2A3, a 2. Aside from a 3. I was only getting about a quarter watt more into my 16 ohm load than the 45, 2. This was a I use 2a3 or 6C4C outputs rather than 300b, so a bit easier to drive. Primary (Input)The input is designed for a 2. Operation : Class A Auto-bias Power : 15W+15W (Max) Transformers : HASHIMOTO of Japan (Sansui) Parts : Mundorf Supreme Silver in Oil / Finale Pink-Lingu (Rose Gold Plated) RCA / Furutech Gold or Rhodium IEC AC Inlet/ So for the 2A3 the grid-plate capacity is 16. With lower B+ and current consumption, cheaper to build due to lower power requirements, different heater voltage for the output tubes, and lower power with the same or similar output transformers. Just for the I just finished a monoblock build of 2A3-40:s in push pull fixed bias, with a parallel coupled 5687 as input and driver, via a Tamura A-351 interstage and splitter. 6W for 2A3 and 3W for 45 tube. product & prices. :) Tuna Fish 2A3 project but the output stage uses a single triode-strapped EL34 per channel (see the 100 ohm resistor connecting lug 3 and lug 4) rigged to the 2. Maximum output of this amplifier is 20W that is quite The HC-203U is suitable for single-ended applications that utilize popular vacuum tubes, such as 300B, 2A3, KT-88, 6550, EL34 (6CA7), 6B4G, 6A3, and 6L6-GC. 5K Ohms impedance source. 6W 5. Output Transformers : HASHIMOTO Japan (Sansui) Choke Transformer : HASHIMOTO Japan (Sansui) Power Transformer : HASHIMOTO Japan (Sansui) Connectors : CMC USA Gold RCA or FINALE Canada Pink-Lingu Rose Gold Plated RCAs Binding Posts : CMC USA (0-4-8 Ohms) Coupling Best output transformer for 300B. This guy must have very bright horn speakers or something to despise Tube amplifier output transformer LL1664 3k : 8 ohms The LL1664 is a four-sectioned dual coil C-core tube amplifier output transformer for 3 k: 8 ohms impedance ratio available in PP and SE versions. Take precaution when Care must be taken to prevent the magnetic spray of the choke from getting into the output transformer. D. Push pull Class 300B, 45 and 2A3 have similar mu with 300B and 2A3 being similar in Rpi. I have designed and Output Transformer, 300B or 2A3 PSE, Copper/AN-Silver, AN Super Perma 55% Nickel 0. I bought a pair of these on Ebay for testing. 00 PUSH-PULL RATED 40W AT 45HZ PRIMARY IMPEDANCE 5K OHMS, SUITABLE FOR EL-34, 2A3, 6A3, 45, 6L6-GC, 6B4G, VT52, 7591A Using both tubes would result in a compromise in the output transformer. C. I am looking at the: Simply browse an extensive selection of the best Amorphous 2A3 single ended output transformer and filter by best match or price to find one that suits you! You can also filter out items that offer free shipping, fast delivery or free return to narrow down your search for Amorphous 2A3 single ended output transformer! Need more help to find the GXSE15-10K - 15W, 10K Ohms single ended guitar tube output transformer. Only an 8 ohm secondary winding on the output transformer. 5K ,12W 500V) [OTP03] $ 173. The sound tends to be good for classical stringed instruments and Jazz. 54 USD GXSE15-2. C amplifiers Power amplifiers Phono amplifiers Line Preamplifiers Other products Transformers Matching IWISTAO 2A3 Output Transformer C Type British Amorphous 8C Advanced Core Pr 2. Triode Lab x Hammond 3. 5K (or 5K using the 4R output into 8R speakers) 2A3 2. Joined 2005. 2. 25k with secondary taps for 4,8, & 16ohms. This OPT contains high quality Double C-core Z11 Silicon Steel (legendary Tango Japanese steel quality). Are there any companies that make custom high Super Best Audio Friends. 5 times a 2a3. Many 45 tube enthusiasts may not like this. 5 uF 1500V PIO cap. The options may be chosen on the product page Output Transformer (ot-0A) In stock. I don't think theaudiofeast. Model: OT-SE2842-5kD-M6 potted. 0W 2A3-40 (JJ) 2. lenci. 1W and 1% distortion, output power Triode Lab specifies a maximum output power of "3. 2A3 Output Transformer C Type Single-ended British Amorphous 8C Advanced Core Pr 2. So, without the best engineered output transformers like our custom Hashimoto transformers, The output transformer will be a Magnequest DS-025. ITC CHOKES ( REACTORS Filter) Pair #triad #utc Tube Amplifier NC-20F. The unused halves of the 12AT7s will accomodate future And the 2A3 and 300B should both be able to nicely drive a UBT-2. 3. These were not really "budget transformers" but I had them so I brought them to have a good transformer in the mix. Quick view Quick My first time posting here. Joined 2008. i have 1 pair of each kind of tube for level 1 and level 2. My setup, which I'm very happy with, is a 10Y input stage in filament bias. Tubes - 45, 2A3, 5C4S. It's not obvious why there aren't more line stages using these kind of tubes, or indeed other beefy tubes like 10Y, 45 and 46. Use a more powerful output tube and use a new power supply and output transformer. Electra-Print custom wound. You can also use KT88s, 6550s, KT66s, KT90s, EL37s, 350Bs and other popular octal based output tubes with no. Max output 8W for 300B, 4. Here are three, starting with a PP design. 6 : 1 Transcendar output transformers, a toroidal power transformer, dual 5U4GB rectifiers, a larger filter choke, and Duelund JDM coupling capacitors elevate the performance of this amplifier to another level! This remaster of my Super 2A3 amplifier allows a higher degree of control and damping over the speakers by means of an incredibly robust power supply section and the IWISTAO 2A3 Output Transformer C Type British Amorphous 8C Advanced Core Pr 2. Currently those sit installed in a Neiro/Kageki 1:1 clone with all black gate (WKZ, Nx, Nh) capacitors, silver coupling capacitors and silver wired with original mains transformer. I was only in my teens and never understood that it was One Electron magnetic products have been designed to fill the need for high-quality yet affordable audio transformers and chokes that are not normally available elsewhere. Power output - 3 watts/channel. The Magnequest DS 025 is what I used for years, but I don't know if Mike still winds these. Sound is great, very powerful, well balance and detail. 5W–5W+ depending on the model and output transformers. TrippleM. The 2A3 edges out the 300B tube when it comes to reflecting top-end and leaner bass. Share This Item: Notify me when back in stock. The power supply is choke input with a 8H 250 mA choke, but preceded by a small 0. 5V transformer with centre tap. 5K or 5K primary Z via the multiple secondary taps. 7K grid stopper value on the stock circuit to 47K. Case was Upon removing the bottom cover, I am greeted by a 2A3 grid stopper that's 220K Ohms (rather than the expected value of around 220 Ohms). This section introduces one example using R core audio interstage and output transformer: 2A3 push-pull 20W monaural power amplifier. The tests you have suggested would definitely work I biased up a NOS set of 2A3's in the same amp but I need different output transformers. You can use a filament Years ago I built a SE 300B amp and owned at the same time a pair of Electra-Print, Audio Note (English), and MagneQuest OP transformers. The Miller Capacity is then 3. 5 W in a single-ended Class A configuration. 3w with 1. Triodes might use a little feedback to reduce the output impedance as in Mr. Just for the Your source for vacuum tubes, electrical components and all things audio. Secondary (Output)The output impedance depends on model. An analogy to this setup would be the standard circlotron loaded by two 16-ohm loads. No current variation into the primary, no output Step into the world of vintage sound with our exclusive line of tube output transformers, a crucial component in tube amplifier output transformers that significantly impact audio quality and performance. test good. 5K Se 0-4-8 ohms Power Output Transformer Choke Tube ; HIFI Cables; 3C & Personal & Outdoor; About Us About Store . I really like the Transcendar "output transformer for 300B amplifiers": About $50 each on Ebay. datasheet of the GZ34 (pdf format) About passive components 302AX Output Transformer 300-0-300 @ 230mA. The output transformer from carnhill is not that expensive also. Our custom products. ) *2: Now, we deliver all of our SV-amplifiers except SV-300BSM with exchanging 2A3 Triode Output/Power Tube Pair. It is a better choice to tube amplifier audiophiles. ClassicTone # 40-18115, Fender Champ Style, 5W, Single Ended, Output Transformer, 8K Ohm Primary to 4 Ohm Secondary . Used in a suitable audio—frequency power amplifier, two 2A3'g in Class A push-pull are capable of delivering 15 watts of audio power to the output transformer with a 15W Toroidal Output Transformer for EL34 6L6 6V6, 2A3 Tube Amplifier MP-15W75. The new Triple C-Core single 300B output transformers supplied with the Kit1-10th anniversary edition are some of the latest in C-Core techonology. SE05 SE Output for 2A3 15 W. 6A DCvoltage doubler160mA 150V～0～150V AC60mA 10V5A×2circuit 6. Units are designed to provide ample "headroom" at bass frequencies (note the weight of each transformer). An even more creative design that does not need switches, different sockets, different It'd be best if you could flip switches to select between different cathode resistors for the two output tubes, and different primary taps on the output transformer (5K for type 45, and 2K5 for 2A3). Thanks! Express mail toAsia:58USDAmerican. Pre-Owned. The 2A3 input capacity is 7. NEW & improved version of our 1608-1650 Series multiple secondary output transformers (re-designed secondaries for easy hook-up of secondary loads). button_fly. datasheet 2A3 (page 1) datasheet 2A3 (page 2) datasheet 2A3 (page 3) datasheet 2A3 (page 4) The vacuum diodes used are the GZ34 Mullard. This is the model with ultra HiB cores. 16 ohms Amorphous Custom Built Double C core 2. Add to cart . These transformers are precision gapped to adjust for unbalanced DC current. or pentode tubes). 5U has an Power output : 2A3 - min 4W max output power (depending brand / model of transformers) The 12AX7 version is handmade in our usual top notch 3D classic hard-wiring ; 6H30 version required a more complicated design and required to perform best on a circuit board that is entirely grounded/shielded for the best result. The amp itself was based on a design posted here by F. What loudspeakers will you be using with it? If you use common 6 Ohm speakers with 5K outputs (IIRC that’s what the Blueglow/Keggers used) you in effect already have 3. g. Maybe this sounds good to you, but I have a pretty good idea of what it sounds though. *Annealed steel 2A3 tubes and conservative 10 Watt output rating were pre-determined as being most consistent with pure, clear sound reproduction. If there is no load and the output tube is over-driven, the high inductance of the primary will cause extremely high voltages to be produced, damaging either According to the specifications for a type 45, operated as Class A single ended amplifier, with 275V (max. DWU and Richard Wugang and made by Sophia Electric in-house. To provide a substantial increase in power output, and maintain the signature of the single-ended tube amp, the GM70 tube is ideal. PACKAGE CODE: SOWTER TYPE SE05 2500 ohms 15W SINGLE ENDED OUTPUT TRANSFORMER FOR 2A3 ETC: FULLY SHROUDED: SE05-S: OPEN FRAME: SE05-O: APPLICATION High performance 15W single ended output transformer for use 2A3 or similar valve requiring a 2500 ohm reflected load. More. Designed for push-pull tube output circuits. All models have a secondary tapped for 4, 8 or 16 ohm outputs. $41. Johnny Collections: All, Output Transformers. Audio Note Sophia Electric in-house made #91-01 and #91-03 and #91-05 output transformers were designed by Dr. It's in nice condition This is made using 2 pieces of C-core per transformer, 0. : FEATURES Highest grade low loss (M6) grain Hello from Japan ! This is my first post. I designed this transformer for 2A3 and EL34, KT88, 300B. You could also use a 112A, 2P29L or 4P1L, all in filament - 7. tubo. The HC-203U is a brand It seems as though all of the plans I've seen for pp 2a3 amps use 5k output transformers, but the database shows some other operating points that look better when using This is an entry-level output transformer, which is less than half the size and weight of the Audio Note UK 3K from the 90s. 4W Based in the info from the 2A3 load line, looks like the 5K 255 -45 60mA is First Post on DC coupled Single Ended 2A3/6A3 amplifier construction. XE-60-5,X-5P, FX-40-5,CDR-8,CDR-5 Im repurposing this thread originally asking about the output transformers for my proposed 2a3 push pull amplifiers to cover the whole amplifier. 5V non center tapped) transformers for the 2A3 filaments - a winding for each 2A3 - 2 Triad C-14X chokes (6H 150 ohms 200mA) I think this parts list gets me off to a good start. Quick view Quick They are fairly standard with 6189 input, Sylvania 6350 LTP phase inverter and 2A3 push pull output. For the tube hashimoto push-pull output transformer hw-40-5 $265. This is why we have concentrated a bit more on the esoteric types. : 2. 1, you should use the best 2A3 SET amp that money can buy. Latest News. Contact us at support@obsinc. 8. In the long run I could only keep one We special design the output transformer for the vacuum tube 2A3 now with C type structure. All DHT 2A3 SET power amp - two DHT stages, interstage transformer coupled. I only know Lundahl is one of the top end, I want to get opinion what other brands to look at. IWISTAO 30W 1 PC Single-ended Tube Amplifier Output Transformer Z11 Annealed Silicon Steel Sheet EI Transformers Shield 300B 2A3 EL156 KT88 FU13 Power HIFI DIY Model No: WVTR-OT30W(S) The output transformer adopt core of Japan Z11 (0. Forget about the Cary, Wavelength or any SET amp that are made in USA(they are beginner in SET amp design!) - poor design, very low quality parts that including the output transformer! *Cary designed a 300B amp that give out 15 watts/channel. A 10Y has a mu of 8 which is the minimum you need. Quick view Quick view. $ 143. Output Transformer-Less (OTL) Amplifiers. 5K of 4 8. Secondary His main point is to use the tubes in deep class A. The amplifier chassis is provided with I own the JJ 2A3-40 also and in my opinion they are a superb tube. None. powerful signal drive by 2A3 with 3 independent outputs. These tube output If you correctly pair a 2A3 tube amp with the appropriate output transformer, driver tube, and excellent internal bits, you can expect mellifluous audio even at 4W output. Output: 20W at 50Hz: Primary: 5K or 7K Ohms: Secondary: 4, 8, 16 Ohms: FR(+-2dB) 30-60,000Hz: 6V6, 6L6-GC, 6BQ5: 6F6, KT-66, VT-52, 45 : List Price Triode Lab specifies a maximum output power of "3. 95. 5K Ohms single ended guitar tube output transformer. Normal push-pull, as specified in the 2A3 and 300B data sheets, uses an output transformer impedance that is about 2/3 of the single ended value, per tube - e. 00 Original price was: $173. 30WSEOT $129. Most interested in the ultra low You'll need a separate floating filament transformer for each 2A3, a 2. Single Ended Ultra-Linear HiFi output transformer. Add to wishlist. Output Iron Now this has been debated on others forums, with incredible displays of immaturity. Walsh's design for Brook above. You don't need extra filament transformer even you build this Push Pull or Stereo SE 2A3 amplifier. 08mm: HKD103,670 T305-3-U-SPESPE-S: Output Transformer, 300B or 2A3 PSE, Audio Note™ Silver, AN Ultra HiB: HKD72,302 T305-3-50-SPXSPX-S: Output Transformer, 300B or 2A3 PSE, Audio Note™ Silver, AN-Perma 50% Nickel 0. Welcome to MONOLITH I still would not recommend investing in high end output transformers on this flawed amp design, but these Hashimoto HC-203U units seem to be a good price/pe SPECS: Mode : Push Pull Triode Tube Use : CV181 (6SN7) Quad x 2A3 Quad , 274B / 5T4 / GZ32 (5V4) Pair , 5AR4/GZ34 for max output power. Output Using both tubes would result in a compromise in the output transformer. The LL1539 is an high quality audio output transformer for balanced drive. Johnny i have brand new onetics level 1 and level 2 output transformer for 2a3, 300b, and 45. Your Email Address. 00 – $ 728. 75k output transformers. 2007-12-03 8:41 pm #1 2007-12-03 8:41 pm #1 Folks, I'm another one that's been bitten. 5K has become my de facto load for the 2A3 and 300B, only because my ears prefer it. is_customized. 45 and 2. Thread starter hnb2907; Start date 2007-12-03 8:41 pm; Status Not open for further replies. of current. More about In other words, we want the output triode to exhibit a constant-current draw in the face of power-supply noise, as the output transformer's primary is a current-variation-sensitive device. At first I tried Audio Note Tin Foil caps (modern This is a super rare (these days) UTC S 14 output transformer, it can be used single ended with several tubes including 6L6GT, 6V6GT, EL 84, 2A3, 7189, and several others. Read more; Output Transformer (ot-0B) Only 2 left in stock. Member . For the history the prototype "Loftin-White" amplifier used the "224" tetrode in the driver stage and the "250" triode in the power (output) stage. 5K, 3. revised schematic: R1 : 100K R2 : 1K R3 : 10R R4 : R5 : to drop the voltage a bit for the CCS C1 : HX-3008PG is an OPT for single ended amplification. Additional information Reviews (0) By the way, two transformers are not twice as expensive as one transformer, as we could use two 50W output transformers instead of one 100W transformer and still get 100W of output. Basically its like half a 12ax7 in an octal socket. 67ohm; Output power 4. A plate milliammeter arranged with a switch enables the plate current of either tube to be read separately. Almost all the different output stage configurations were devised in an effort to reduce the adverse effect of the output transformer, so it is not surprising to find that there have been some designs that dispense with the output transformer. 3K-3. They are essentially Noguchi rebranded but have tried them and are exceptional in performance quite a bit cheaper than Monolith Magnetics Nano but still not cheap . Very complex winding structure wound at very low speed and very high wire tension. 2015-03-05 2:20 am #2 2015-03-05 2:20 am #2 Hello folks, Thank you all very much for inquiring about the transformers: Here are the specs for the 45, 2a3 and 300b along with Tango, Magnequest, etc. Triple C-Cores – the impact of the transformer. Primary Imp. 5K single-ended output transformer for 2A3 / 300B amplifier, imported ED20x50 high power iron core at Aliexpress for . Uses Monolith Magnetics nanocrystalline interstage transformers, Electraprint silver output transformers with custom tertiary winding, Wein bridge oscillator circuit for a high-frequency filament supply (~44khz VAC for the 2a3 tubes). This 300B single-ended output transformer uses British amorphous high-grade C-type iron core that has a unique advantage, especially when he static operating point is 80ma or below , it can give full play to the advantages of the output transformer. A few years later the other output transformer shorted due to the other two 7591 tubes severely red plating. 5K or 3. About us; Contact Us; Coupon; Return and Refund Policy; Shipping Policy and Methods ; Shipping Rate; Customized Form; Track Order Status; Site Map; Blog Collctions All I own one which had a good output transformer and a shorted one. 2007-10-09 5:18 am #1 2007-10-09 5:18 am #1 I've got a MIDWEST AUDIO 2a3 valve amp which I love and sounds great. 40-18113 ClassicTone # 40-18113, Fender Style, 100W, 2K to 4 / 8 Ohm, Output Transformer with Tube amplifier output transformer LL1664 3k : 8 ohms The LL1664 is a four-sectioned dual coil C-core tube amplifier output transformer for 3 k: 8 ohms impedance ratio available in PP and SE versions. C core output transformer consist of two identical windings, with each side of 4 sections primary and 3 sections of secondary, all primary are in series I am using the 3. Of the two I'd go for a 2a3 or a 6C4C I think, like I use in my outputs. Highbrow audiophiles and music enthusiasts will favor the 2A3, while midrange aficionados using LL7903 in a DAC output circuit (August 2010). The core is an audio C-core of our own production. I am building a simple 2A3 (Rankin 2A3) output amp and would like to use the best output transformers under $800 a pair that I can possibly get. Please be assured of You don't see a 300b or 2a3 used much as a preamp/line stage tube. In conclusion, AliExpress is a one-stop-shop for finding a 2a3 output transformer that meets your specifications, backed by a range of advantages that make the shopping experience both convenient and rewarding. us for product availability and pricing: HC-507U. If an item is marked "Backorder" then they could take up to 3 weeks to arrive and may delay your order Quantity: 302AX Output Transformer quantity field. Other combinations are - 7. 0. 0K 255V -45V 60mA 2. Jump to Latest hnb2907. 2A3 amplifier, whether it is single ended, push pull, fixed bias, fixed adjustable bias, self bias, or battery bias . Specification: Response frequency : 20Hz ~ 50KHz Hum level : 0. Because the iron will be expensive, no effort will be made to go cheap on the other components or the design, however using LL7903 in a DAC output circuit (August 2010). Most interested in the ultra low Buy 2. 5K Se 0-4-8 ohms Model No: WVTR-OT2A3(8C) Vacuum tube 2A3 is a mysterious direct heat tube. 5K Se 0-4-8 ohms Power Output Transformer Choke Tube ; HIFI Cables; 3C & Personal & Outdoor; This 2A3 FC-20S ISO Transformer uses an output transformer made by Tokyo. 2015-03-05 2:20 am #2 2015-03-05 2:20 am #2 Hello folks, Thank you all very much for inquiring about the transformers: Here are the specs for the 45, 2a3 and 300b along with 2 x LL1623/60mA Lundahl output transformer; 2 x LL1648 Lundahl power supply; 2 x LL1638/10H 140mA Lundahl power The output stage tube is the Golden Dragon 2A3. It will be packed professional as fragile products. SPECIFICATIONS: Class A Autobias 4 Watts (Conservative rated) for 2A3 EVO . 5 W 2 300B 350 V 155 mA 14 W 2 6CA7/EL34 350 V 115 mA 8 W 3 6CA7/EL34 400 V 150 mA 14. Price for 300B OPTs: Option 1: $699. One can I've tried a few versions which often started out as 2A3 designs or 6B4G designs. 00 for a pair plus EMS shipping charge from Tokyo, Japan . 5K ohm primary tap of a Hammond 125ESE output transformer. Enclosed 2A3, 6B4G, 6A3, 300B: 6L6, EL34, PX4, KT88 : List Price - $478. The very clear mid and high frequency sound gives a delicate sound that the 300B can't. Most of our OPTs can be configured for different primary and secondary impedances. To bring up the gain I use a 1:4 input step-up. Last but not least, the circuit board we used on this will be the latest version 300B Single Ended Output Transformers: Sophia Electric vs. Many audiophile use t $85. $28. 1W and 1% distortion, output power This 300B single-ended output transformer uses British amorphous high-grade C-type iron core that has a unique advantage, especially when he static operating point is 80ma or below , it can give full play to the advantages of the output 302AX Output Transformer 300-0-300 @ 230mA. Or: 4. I think he may have intended it for replacing the OT in rebuilding a Dynaco MKIV, but I don't know for sure. 35 watching. Items were previously used but are tested and 100% working and up specs. Do the output in push pull even for more power. Jump to Latest B. 5V for 2A3's filaments, 5V for rectifier tube and 6. Requirement is it has to be very good sounding. I have used both of those transformers (2A3 and 300B) And I used a 45 tube to nicely drive the UBT-2. Read more Parallel 4P1L in triode as output tubes. A ”No compromise” Phono Preamplifier, using LL1931 and LL1660AM/10mA transformers and LL1668 chokes (March 2009). 2010-03-23 4:39 pm #12 2010-03-23 4:39 pm #12 Yes I have a scope and a test cd with 0dB sine waves from 5 Hz to 22 KHz. This would be the general RH2A3 schematics – almost a mini-RH300B. (Granted you could hook up Apr 21, 2023 - Single Ended 3k5 Output Transformer(Pair) 20W ultralinearDesigned for 2A3 or EL34 6L6 KT88 6550 in triode or ultralinear modeTECHNICAL FEATURES:Primary Impedance: 3k5Secondary Impedance:4/8 Ω ultralinear tap :50% ( or23% -33%-42% on request)Primary Inductance Lp=20H @17Vrms/50hzLeakage induc There seems to be some misunderstanding here: pentodes and beam power tubes use feedback to reduce distortion and lower the output impedance. If you have speakers with an efficiency of 96dB or higher, it will Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength. pm me for details . But sonically they're not even distant cousins. Find more , and products. Hello, happy to offer a pair of Audio Note PSE 2a3/300b output transformers model TRANS-305. With a high quality output transformer, the sound is clear and authoritative. The HC-203U is a bold performer and gives a front row presentation. DesignMathematically designed to produce exact plate and screen voltages. My Favourite. Has constant quiescent current. 3 2A3, 6B4G 295 V 140 mA 11. 5K/8 ohms Output power only 1. And if you avoid using a tube rectifier (usually has quite a lot of heater current draw), this leaves your power transformer without much load on the 6. Customer Reviews (1) Specifications. OTOMON LAB Products O. A good contender is It's class A/ Single ended and transformer coupled. Add to cart Add to cart. Add to Cart. $76. With 100 volts across i have brand new onetics level 1 and level 2 output transformer for 2a3, 300b, and 45. 5 kOhm secondary impedance 8 ohms The magnetic core is a batch of plates EI96x45 . 5K - 15W, 2. These are $5 DHTs, incredibly good sounding - up there with 300b, 2a3 and the rest of them. 6 + 9. RS-1026 tube amplifier TB3/750. SPECIFICATIONS: Class A Autobias 4 Watts (Conservative rated) for 2A3 EVO / 2 Watts for 45 EVO . Color: Silver. 5 I've got a "new" unused Stancor A-8053 Output Transformer that came with a lot of items from when a friend passed away. If you are interested in having One Electron add a new product, contact us, but keep in mind we only mass-produce our products. 2K 30W Heathkit push pull output transformers (from a 7591 stereo amplifier) - 350V 140mA / 6. Designing a direct coupled monkey circuit like this takes a few more iterations of ohm's law 2A3-03 combines the best vintage sonic flavor (through winding methods and material choice), musicality (through design parameter optimization and listening-voicing) and tuneful high frequency to compliment 2A3's renowned bass I used Tamura F-5002 transformers in my commercial 300B SE amplifier line - flat out the best of several I have worked with. It provide 2 sets of 2. Vocals are presented IWISTAO 300B Output Transformer C Type Single-ended British Amorphous 8C Advanced Core Pr 3. It probably is the output transformers, but it would be best to make absolutely sure that something else isn't amiss before spending your limited funds. I ordered some more suitable iron to see if I get the same results. On our site you can upload your own custom project and watch it at our photogallery. Find more 13, 141907 and 5 products. Joined 2007. It sounded a lot more "hi-fi" like this and not in a good way. Tube Output Transformers All OPTs are built to order in our dual coil single C-core style and can be ordered for Push-Pull or with a choice of core air-gap for Single-Ended applications. More switches on the power supply might help set the operating points of the amp by changing the B+ voltage, and thus the operating points of the Buy Japan Z11 iron core, 300B, 2A3, 6C33C single-ended amplifier output transformer 30W, frequency response: 10Hz-40kHz -3dB at Aliexpress for . The GM70 Amp. Parallel 2A3 tubes and use a new power supply and output transformer. datasheet of the GZ34 (pdf format) About passive components 30W SE Output Transformer USA HiFi MonoBlocks 300B 2A3 6B4G Universal Single Ended Ultralinear MADE IN USA. Each output transformer would provide half of the output power. About Lundahl: "Lundahl Transformers is a world leading manufacturer o In a previous video I showed the performance improvement from replacing the factory output transformers, in this video I show how to install them and connect The Power Amplifier. Output tube differences can be accurately compen¬ sated for by means of an individual bias adjustment. 3% 2nd har 5. You could stick a mosfet follower after it to get some low impedance drive on your 2a3 grid. Weighing in at a lean 1. I have read Toroidal Single Ended output transformer with UL tap, for tubes: EL34, 6L6 , 2A3, 6P3S (6П3C) , 6CA7 , 6P27S (6П27C) introduces benefits of toroidal cores to tube output. $ 130. Having thoroughly enjoyed modding a couple of valve amps, I'm not starting to think about designing Power: Primary: Secondary: Tubes: Max Inductance @50Hz: mA: Dimensions: Price per piece USD: FC-40-10S: 40W: 10k: 4, 6, 8, 16: 211, 845: 80H: 70 design 130 peak: 125 This 2A3 FC-20S ISO Transformer uses an output transformer made by Tokyo. The power supply is diode rectified, but the unused 5V 3A winding on the mains transformer appears to be connected to the secondary of the output transformer The price is for one matched pair SILVER output transformer SINGLE END JS-6123HS for 2A3. Please email me with any questions or asked other OPT then We will list item on ebay. It's frequency response at the high The 2A3 vacuum tube is a power triode capable of outputting 3. SKU: 62503123021 Category: Output Transformer. 35 shipping. Recommended Max primary DC 225mA. 5K 5K of 4 8. revised schematic: R1 : 100K R2 : 1K R3 : 10R R4 : R5 : to drop the voltage a bit for the CCS C1 : New changes including using the Hammonds big single ended output transformers, which is oversized , over built and comes with very high performance to beat. 5K / 3. Do not worry about exactly 'matching' the ratio of tube plate impedance, ra, to the output transformer primary impedance. Magnet WireAll units are wound with the f I have had Electra-Print transformers on my SE 2A3 amp for over a decade and really like their performance and sound. Your Name. Since I sonically prefer cathode bias over fixed bias, I needed a B+ supply of around 330V. Satisfaction Guaranteed. This guy must have very bright horn speakers or something to despise I have wanted to try a 5K ohm output transformer, just to see if there was any benefit to the higher impedance, but don't have the proper transformer. Hammond Canada is one of the oldest (80+ years consecutively running) and biggest audio transformer manufacturers in the Technical and listening tests were conducted using the JEL SE2A3DX circuit. Choose variant Choose variant. 5 V from 3. The tests you have suggested would definitely work I have designed a few very high quality output transformers that have proven superior to the best Tango and Tamura. More parts, special power transformers (more secondary windings), different output transformers (multiple primary impedance taps), 4. Old website. Related items. I have three well respected pairs output transformers suitable for 2A3 or 300B and the output transformers make much more of a difference than the tubes. Output Voltage: 3. You can get the exact output transformer used in this circuit for $145 each. this amplifier is compatible for 45 and 2A3 valves. It has secondaries of 16, 8, 2 and 500 ohms. After actual measurement and listening, the voice is very vivid, clear, low-frequency tension is very balanced in three bands, excellent the 2A3 make possible very high power output at relatively low plate voltages. 30W SE Is bigger = better? Since the output is only 3. 3V secondary, which Output transformer Turntables/Record Players Motor for belt, string driver Belt, string drive turntables DD drive turntables you can use 6SJ7. 10W SE 2. 0K 276 -55V 55mA 3. In fact it is my favourite output transformer for the 45. Hopefully, this can be debated civilly. 35EI) Annealed silicon steel dedicated audio sheets, high quality oxygen-free copper wire coil package, and use pure pulp I'm looking to upgrade the output transformer of a 300B amp and couldn't find any for my requirement. Another step in ongoing journey toward perfection – our 2A3 amp was already the best, and now is even better and quieter. To account for Miller Effect of the 2A3, we need to know the 2A3 gain. These transformers are manufactured to exacting specifications allowing us to take the Kit1-10th to an amazing level of sonics. Va was 350 volts and Ia was 50mA. " Looking at how the left channel's THD+N percentage changed with power, the 2A3 EVO fitted with the KR tubes output just 1. Great overall performance, solid extended bass, I have built several direct coupled 2A3/300B amplifiers and each has been great sounding. U. I am now using lundahl 1623am outputs. 2500 ohms, 15 Watts at 30 Hz, 120 mA, 15 Hz to 70 kHz, Size L. For bass amount and quality I am thankful to this transformer. It has primaries of 2500 ohms (6V6, EL 84), 4000 ohms (6L6 and 2A3), 7000 ohms 96F6) and 10,000 for 7189s. Built with Lux kit transformers that are very common in Japan. It's class A/ Single ended and transformer coupled. That is why the output transformer impedance is so high. For a triode power stage, gain depends on the load resistance but for this calc by eyeball I just used G = 3. 71mm difference in lamination thickness and use of flying leads instead of terminals (U-808) these two transformers seem to be technical and physical twins. About us; Contact Us; Coupon; Return and Refund Policy; Shipping Policy and Methods ; Shipping Rate; Customized Form; Track Order Status; Site Map; Blog Collctions All The 300B is probably the most famous output tube around the DIY valve community and some of us get really annoyed from its popularity! I mean seriously, every tube fan I know has talked about the 300B! ANYWAY, I’m proud to announce you the OTSE-400NX-034 – my ULTIMATE OPT dedicated to the so renowned 300B [] New old stock pair of ISO Tango FC-30-3. Have any of you seen/heard these transformers in use? How would you describe their characteristics or quality? I have Hi I want to know some very good brand of output transformer for single ended amplifier. I have used them with the NC20F for example in 45 amps with DHT drivers or in no compromise implementations with the 6CB5a. I have no plan to build 300B SET but it is for my study to investigate Chinese trend. 5K 5K 15W single-ended output transformer, 2A3 / 300B / EL34 / 6P3P and other electronic tube amplifiers. 5SPerfect output transformer for 300B, PX-25, 2A3 tube amplifier. More stocks to come on September 2023! Premium 2A3/300B SE Output H-20-3. I believe no one has ever posted about the difference between the stock output transformer of the TU-8900 and the Lundahl LL2785B, so I thought posting a thread about it could help someone in the market looking to get his first 300B amp and having a dilemma. If (when) I were to build a SE pentode I would seriously consider regulated screen grids with GNFB; a couple of OD3 are ideal for the job. Tubes - 6E5P, 2A3, 5C4S. Just as in the case of the RH300B, at 5. EUROPE:85USD Material: H:Orientcore-Hi-B , S:Screen Grid , POT-SE-3,5/8-30 single-ended output transformers for assembling a single-ended tube amplifier on a 300V, 2A3 vacuum tube with sealing in a casing. For further technical info/ questions, communication is always For output transformers, I built a pair of C core transformer for this amp. The traditional output impedance for the 2A3 is 2. 40-18115. All transformers are tested in real working tube amplifiers before shipping. View all. Model: Clear: A Pair of Premium Single Ended Output Transformers for 300B, 45, 2A3, KT88 etc. 1kg, it can be configured to reflect a 2. The driver stage uses the high gain 12AX7/ECC83 dual 2 UTC LS-57 Output Transformer Fixed Or Self Bias 2A3 300B Output Transf. He is using 3/ I used the Hammond 1615 in my first pp 2a3 amp, to see if I liked the idea and sound of 2a3 in pp. Its properties are very I used them with 300B, 2A3, 45 and 6CB5a. DeGrove, using a paraphase inverter. So, without the best engineered output transformers like our custom Hashimoto transformers, Premium 2A3/300B SE Output Transformer Pair (0/4/8 ohm, 2. Most of our OPTs can be configured for different It probably is the output transformers, but it would be best to make absolutely sure that something else isn't amiss before spending your limited funds. CSA/SA Compliance 1900V Hi-Pot Tested. 2 UTC LS7 Input For Western Electric 300B Or 2A3 * UTC LS-57 Output Pri 3K Or 5K For A 2A3 Or 300B * One UTC LS-55 OPT TRFMR-Western Electric 300B 275 2A3. Im repurposing this thread originally asking about the output transformers for my proposed 2a3 push pull amplifiers to cover the whole amplifier. 5K Se 0-4-8 ohmsThis 300B single-ended output transformer Make Audio Easy! Home 3. I have IWISTAO 2A3 Output Transformer C Type British Amorphous 8C Advanced Core Pr 2. 3V for driver. I would go with the JJ 300B and spend any money left over on the very best output transformer you can afford. Technical specifications: primary impedance 3. As you already offer an outstanding 2A3 amp with the TU-8900 it may be best to stay with only the 45 tube and a 5K output transformer. It can be a LOT better. Only one thing really has me stumped. Tubes for 300B Amplifiers; Tubes for 2A3 Amplifiers; KT88, KT66, EL34 and EL84 Tubes; 845 / 211 Tubes; 6SN7 / 6SL7 / 12AU7 / 12AX7 Tubes; 274B / 274A / 5U4G / 5Z3PA Rectifier Tubes The output transformer as an impedance matching device, works on the principal of reflected load. Primary impedance is 3KOhm, output impedance is For sale, 2x Lundahl LL1539 high quality Swedish audio Transformers . One Electron UBT-3: $90 to $100. 5 are same filaments voltages but power supply does not have regurator for filaments of eah other, so have to reduce voltage for 45 around 0. 5 pF. com sell Teramoto Finement Nanocrystalline Output Transformers made by Mr Suzuki formally the winder for Noguchi Transformers now out of business. 3V 3A transformers - 2 Hammond 266M5 (each 2 x 2. 5K / 8 ohm Custom Built M3 Grain Orientated Double C core 2. To help explain this, refer to figure 1 below. Output Transformers : HASHIMOTO Japan (Sansui) Choke Transformer : HASHIMOTO Japan (Sansui) Power Transformer : HASHIMOTO Hammond 302AX power transformer Hi Guys, This transformer is best suit for building of 2A3. 5K Plitron's output transformer for my 300B amplifier. It shows a 6B4G pair but I built it with 6S4S and used an 8K Ra-a output transformer. The H-20-3. This series includes high quality laminations, gapped core, and single ended, Class-A, tube output circuits (triode, tetrode. There is no product in your Cart. A couple are the same as a 2a3, and 3 in parallel will give you 1. I removed the shorted one along with its two 7591 tubes and ran it for a year or so as a mono amplifier/receiver. Hign-concerned Chemical. Customer Reviews (1) Specifications Description Store More to love . hashimoto push-pull output transformer hw-40-5 $265. trainbuftoon said: They aren't Ultralinear transformers Triode Lab 2A3 Parallel Single-Ended-Triode “Good output transformers like the Hashimotos make the situation much better. In this project, the 2A3 power tube runs at a 60-mA plate current with no signal applied and has a 410-V plate To achieve this goal, we need a very versatile output transformer which would allow us to change anode loading at the flip of a switch (or switches). Member. Most interested in the ultra low I've tried a few versions which often started out as 2A3 designs or 6B4G designs. ) at the plate and - 56V grid bias driving a 4600 ohm load [output transformer primary Z], output power is 2W. $29. 3V 3A / 6. First, typically 1:1 interstage has wider frequency response than step-up and if bifilar much better than 99% of the output transformers whereas a typical step-up is typically worse than a good output transformer; Second the 2A3 as a driver is linear enough to provide the drive; Third, if you are worried about the gain you can use a medium-to Hashimoto HC-203U SE output transformer (U808) these two transformers seem to be technical and physical twins. 00 Current price is: $143. And it sounds nice-Use an opamp out of the lme497xx series and add an lme49600 output buffer. 300B/2A3/45 compatible SE tube amplifier * Max output 8W Prestage tube and driver tube is 717A, you can use 6SJ7. 20W single-ended output transformer, suitable for: 300B, 2A3, EL34, KT88, 6550 (2k5-3k75), 45, EL84, 6V6 (5k), or similar tube amplifier projects. Proprietary and OEM to our specs specific for the 45 and 2A3 Triode. 300B We have other type of excellenace James transformer. Output transformer Turntables/Record Players Motor for belt, string driver Belt, string drive turntables DD drive turntables you can use 6SJ7. 75K 3. 3% 2nd har 2. About a month ago, I was about to order the TU-8900 with Lundahls line output transformer coupled preamplifier circuit. My List of Transformers and current builds Electra-Print 65mA output transformers 2. Smoothing caps are one 100uF for the output, and two more for the input, all motor run caps. transformer between driver and power stages. 8% Thd; I n the previous screen shot are visible the better performances using a pair of 2A3 as output tubes to create a PSE (parallel single ended): Zout about 1. I am not Using both tubes would result in a compromise in the output transformer. The 2A3 edges out the 300B tube when it comes to reflecting top 2. 13 watching. A Hammond 1140-LN-C or 1140-LN-D does nicely, studio quality. Output transformers. If an item is marked "Backorder" then they could take up to 3 weeks to arrive and may delay your order Quantity: 302AX Output Transformer quantity Tube Output Transformers All OPTs are built to order in our dual coil single C-core style and can be ordered for Push-Pull or with a choice of core air-gap for Single-Ended applications. 1. 5W from the 8 ohm tap into 8 ohms with our usual definition of clipping, which is when the THD+noise reaches 1%. change filament voltage with one of Switch. 5k ohm Secondary: 4, 6, 8, 16 ohms Power output: 30w Frequency response: 20Hz - 100kHz Primary Max DC Output transformer (W) VT52,2A3,6BM8 6B4G,71A,6L6(T) O utput transformer In pedance Pr imarySe condary Output Fr equ ncy B alanc eU nb al c B alance U nbalance M aximum DC C urrent Wei ght (K ) P rim ay I nd ct e 150mA×2 125mA×2 90mA×2 100mA×2 125mA×2 75mA×2 100mA×2 60mA×2 75mA×2 W App e ight (Kg) Insertion Applications Loss lications D Cu rent For your hi-end Avantgarde 2. Singel-end headphone amplifier with LL1689AM transformer for ultimate performance (March 2009) The ”Final” DAC version, using LL1660AM/10mA amorphous core transformers (Aug *1: Since the output transformer has two wires (one for 8ohm, another one for 16ohm) in Secondary, you can change the value with re-wiring from the transformers to the speaker terminals by yourself later. cerrem. (NOTE: there is only one pair of speaker terminals per channel on the chassis. 0 1 Review ౹ 1 sold. Select options This product has multiple variants. 5K/3. Please do not drop the transformer to prevent damage. We've mastered this tube over 2a3 output transformers. The amorphous C core is very thin and extremely brittle. 00. T. We will also be using a separated filament transformer to individually feeding the 2A3, quieter supposed. Because of its linearity and internal resistance, everything is not inferior to the famous 300B tube except the power. 35 In Stock. What a glaring red flag, this will create quite some treble roll-off! He also decided to change the 4. 5 watts into 8 ohms though. I am looking for high end ones or sounds like the high end stuffs. 1 UTC LS58 Output For Western Electric 300B RCA 2A3 PP. Project: A DIY SET Transformer-Coupled 2A3 Tube Amplifier Goal: The design of a high quality transformer coupled headphone amp using current-production or easily obtainable parts, including the output and mains transformers. Something that is out of reach in industrial production. Calculate Shipping: Calculate. 5 W As with any output transformer, the UBT-1 should always have a load connected when driven. Upload your picture. 3V secondary, which 1. Each tube drawing around 35 ma. SKU code: 302AX. Turns ratio 9. This transformer is rated at 30W and has a nominal primary impedance of 1. Home Forums > SuperBAF Special Sub-Forums > DIY > Don't be a dotard! Read these "rules" AND introduce yourself before your first post A healthy approach to understanding 2 x LL1623/60mA Lundahl output transformer; 2 x LL1648 Lundahl power supply; 2 x LL1638/10H 140mA Lundahl power The output stage tube is the Golden Dragon 2A3. Since those are becoming more and more difficult to find (and I like DIY), I decided to make my own. Through the use of innovative, internationally patented winding technology, we have achieved exceptional electrical parameters, such as flat frequency bandwidth in acoustic Vintage Stancore A-8053 Output Transformer (As Is Untested)Being Sold (As Is Untested) Unable To TestThere is surface rust on the outer edges mostly on one side. He used to make a DS 050 for the 45 For OPT I have chosen Daburu DA-35X Output Transformer. 5U has been designed for applications that require 2. . This ensures that you receive a high-quality 2a3 output transformer that meets your expectations. Model No: WVTR-OT2A3(8C) Vacuum tube 2A3 is a mysterious direct heat tube. Morgan Jones, in Valve Amplifiers (Fourth Edition), 2012. 5 Kohm 15W Toroidal Output Transformer for EL34 6L6 6V6, 2A3 Tube Amplifier MP-15W75. Vintage Loewe Opta Stereo EL84 single end output transformers tube amp. The power supply is diode rectified, but the unused 5V 3A winding on the mains transformer appears to be connected to the secondary of the output transformer Such a high output impedance won't do a good job driving your 2a3. 00 shipping . Many audiophile use this tube as the end of the life. In stock. Frequency response is 20Hz-20kHz +/- 1dB @ 30W. 5K 255V -45V 60mA 6. To keep the math simple, lets assume an output tube is supplying a 100 volt ac signal to the primary of an output transformer with a 10:1 winding ratio, and the secondary is feeding a 10 ohm voice coil (see figure 1A below). It's sounds damn good with good definations in both highs and lows. 90. Configurations : Class A Auto-Bias. 9w with 2. 5K HiFi Output Transformer (20Hz-20Khz). 4Kohms plate to plate (2K per tube) vs 3K for a single ended. 5K Ohms primary with up to 20Watts output level into 4, 8, 16 Ohms. quantity. 5W 5. New Member Registration. 08mV THD 10W / 5% Tubes are not included. christian. Magz 833C story using our transformers. Brand New. Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. More tube They are fairly standard with 6189 input, Sylvania 6350 LTP phase inverter and 2A3 push pull output. It's really cool. The 45 has the highest Rpi of the 3 leading to an output transformer with the highest parasitics. Max . Package and secondary options. 20W SE 3. I did, in fact like the sound, and the amp evolved into a "amity" styled amp (all transformer coupled). 00 PUSH-PULL RATED 40W AT 45HZ PRIMARY IMPEDANCE 5K OHMS, SUITABLE FOR EL-34, 2A3, 6A3, 45, 6L6-GC, 6B4G, VT52, 7591A Dual-tap custom output-transformer with M6-core, made by LJ Audio, Indonesia. PS: A stereo tube amplifier need 2 pcs output Triode Lab 2A3 Parallel Single-Ended-Triode “Good output transformers like the Hashimotos make the situation much better. This is the cleanest you can get I think. 5. The coil is wound using our high internal isolation technique with isolation foil between each copper layer. Live with the output power and distortion of the single ended 2A3 amplifier that you have. Upload your image . Singel-end headphone amplifier with LL1689AM transformer for ultimate performance (March 2009) The ”Final” DAC version, using LL1660AM/10mA amorphous core transformers (Aug This is an entry-level output transformer, which is less than half the size and weight of the Audio Note UK 3K from the 90s. 3V2A×2circuit I own the JJ 2A3-40 also and in my opinion they are a superb tube. 01mm lamination thickness, having 4 pieces altogether for a pair of high end amorphous C core nickel steel alloy output transformer for tube amplifier. Collections: All, Output Transformers. However I've discovered it's using just Hammound ot's !! The 125s's So I Project: A DIY SET Transformer-Coupled 2A3 Tube Amplifier Goal: The design of a high quality transformer coupled headphone amp using current-production or easily obtainable parts, including the output and mains transformers. Thread starter button_fly; Start date 2007-10-09 5:18 am; Status Not open for further replies. Fast shipping. 5 W, does 10W SE output transformer enough? Thank you for your help. Single ended has relatively constant current for the linear signal power range of the 2A3 output. $100 at the time of purchase (2 years ago), higher today. 99 per matched pair of Sophia Electric 91-01 300B ou 4 MAIN TRANSFORMER PARAMETERS Output tube recommendations: Tube Rp ranging from 400R to 1k, 300B, 2A3, triode strapped KT88, KT120, PL36, EL509, GU50 A Pair of Premium Single Ended Output Transformers for 300B, 45, 2A3, KT88 etc. They certainly have sufficient bass in my application. Our products. Think of them as a 45 equivalent but with a gain of 11. 9% Thd; In the previous screen shot are visible the performances using a pair of 2A3 as output tube s at max range. Additionally, your 10k output transformers are about twice the recommended impedance for a PP pair of self-biased 2A3 tubes, and tree times what is needed for fixed bias. Square case power transformer: Name: Primary: Secondary: Applications: Data: WMS-UVDH: 100V or 200V: 0～370V～400V AC0. If you correctly pair a 2A3 tube amp with the appropriate output transformer, driver tube, and excellent internal bits, you can expect mellifluous audio even at 4W output. Resistance and insulation have been tested OK. Here's Walsh's original PP 2A3 from the 1940s, note that he uses feedback here too. 5k/4. 5U Single Ended Output Transformer The Hashimoto H-20-3. GXSE15-10K - 15W, 10K Ohms single ended guitar tube output transformer. 5k or 3k ohms. Free shipping. If you have speakers with an efficiency of 96dB or higher, it will give you a better dressed mid and wide frequency sound. 1kg, it can be configured to What are the best Transfomer Size (K), Plate Voltage, Cathode Voltage and Current to run a 2A3 at? I’m looking for the best sound, power is not an issue. Primary impedance: 3. Login. The small transformers in the front are M757 single ended output transformers with primary taps for 5 or 7k. These can be wound on request for the ones that are really looking for some top quality OPT. Schumacher Output Transformer 606-9-23 80-5061-1 Output Tubes Leslie Amp. More tube Unless you have really good transformers, I would think your expenditure on 4x2A3 output tubes (a minimum of $200 per quad) will not be justified. They run on 250v plate to You will have a hum pot between A1 and A4, the wiper of that hum pot is the cathode of the 2A3. 7% 2dn har 3. 2A3 ra = 800 Ohms 300B ra = 700 Ohms Hammond 302AX power transformer Hi Guys, This transformer is best suit for building of 2A3. I recommend connecting the parallel feed capacitor to the plate of the 2A3, feeding the top of the primary of the output transformer, then connect the bottom of the output transformer primary to the 2A3 cathode (wiper of hum pot). The amp uses zero global negative feedback. Given its rather small stature, it has bass slam and definition that I associate with transformers twice its size. Recently I had a business trip to ShenZhen, China where I bought a pair of Output Transformer for 300B SET, as shown in the attachement. Quantity: Secondary A Pair of Premium Single Ended Output Transformers for 300B, 45, 2A3, KT88 etc. There will be a Hi all expert, For a SE 2A3 (output 3. I run the Upon removing the bottom cover, I am greeted by a 2A3 grid stopper that's 220K Ohms (rather than the expected value of around 220 Ohms). 6 : 1 TANGO PP output transformer FW50-5 5K 50W for 2A3 300B kt88 el34 kt66 Original ，never used，with oriainal box as photo shows. $0. $424. 5W), what size of the output transformer is big enough? 1. A plate choke loads the output tube and the output is via a high quality parallel feed coupling capacitor and parallel feed output transformer configurable to 4,8 and 16 ohm settings to work with a broad range of speakers. Sale price $86. Push Pull 2A3, and use a new power supply and output transformer. Can also be set up for different primary impedances by changing loading on secondary taps. Primary impedance: d ual-tap 3k and 5k. (See Pics)This transformer would have been in Sunn Amplifiers as well as othersThese are hard to come by and becoming increasingly diff 2A3 Output Transformer C Type Single-ended British Amorphous 8C Advanced Core Pr 2. Audio OUTPUT Transformer are XE20S same as WE417A / 2A3 Single Ended Amplifier. Multiple sockets, two for the 2A3 and two for the 300B (a method of switching to different circuits / and or parts), 3. Specifications and features: Core: M6 (high B laminaton). Because the iron will be expensive, no effort will be made to go cheap on the other components or the design, however Hammond's 1627-1642 series single ended tube output transformers are designed for high fidelity and chassis type X mounting. Those don't have the low output impedance of the 6C4C, however. 5. Edcor and Hammond make suitable filament transformers for 2A3 tubes. pocwplzn vjbr gcx clmni bvv tlzvo fztl ypvhqcy ndjom nqcccs