Vintage tube output benefits guitarists, concert venues, and even. It is direct heating cathode and low power consumption. The drive circuitry of the control grids is not shown i assume perfect. The 2a3s will bias exactly at the original operating point.
For files in adode pdf format where indicated, if you want to download the file and view offline, click on the link with the right mouse button, then click on save link as. Its high input sensitivity is good for passive preamp systems. Feel free to send us your hifi audio schematics and we will add them here. If no any abnormal events, turn off the power and wait several minutes for capacitive discharging. Adding this vintage tube will help enhance sound quality, provide simple amp transformation and upgrade existing speaker configuration. Singleended triode set 2a3 tube amplifier schematic. Builtin tube 5z3p5u4g and solidstate rectifier and regulation circuitry with two inductors option in clc. The output stage uses two 2a3 tube configured as push pull. Triode lab orangetriode lab satin blacktriode lab classic dark gray gloss, or custom paint for extra 3 months wait. Legendary rare electube 2a3 tube fivre single plate top end.
The bigger holes of the 4pin plate sockets correspond to the pin1 and pin4 of 2a3 tube filament voltage. The schematic is from the book build our own audio valve amplifiers by rainer zur linde. Sovtek 2a3 datasheet pdf download adobe acrobat pdf reader. The 2a3 vacuum tube is a power triode capable of outputting 3. Bottlehead stereomour kit thinking about building a 2a3. The sovtek 2a3 tube is a high quality tube at an affordable price. Both are ss rectified, so my only options aside from rolling the 6922input tube of the audion and the 12au7 tubes of my bottlehead preamp were rolling the driver tubes.
Antique radio forums view topic tube substitution for 2a3. Im looking to get a tube amp to add to my set up for those times in which i dont feel. Make offer lafayette 2a3 tube tested excellent 6034 and plate current 64 no shorts, gas. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.
The 2a3 tube amplifier a tribute to simplicity and warm. Sound even more detailed than 300b, with great tone separation. The 2a3 tube, which produces around 5 watts, consists of a singleended triode amplifier utilized mainly for output stages of audio power amplifiers. Stereomour ii stereo single ended integrated 2a3 amp bottlehead. This is the only design that will safely put the 45 tube in its best working operation point, because this is designed and engineered with the 45 tube, instead of the more powerful 2a3 tube. View and download cary audio design cad2a3si operating manual online.
Hickok documentation, manuals, schematics, and catalogs. I have tried the amplifier with rca 2a3s dual plate and shuguang 2a3s. This is the most liquid silky high end sound you can hear. They looked the same pin wise and i saw the differences in the voltages but wasnt sure of the meaning. If you have built any of these circuits, we would love to hear from you so send us your comments. Any exceptions will be noted on that tube s warranty tab. The plate can do 28watt, but to get this, you need to modify the amplifier. The av 2a3 sl is a direct replacement for the rca 2a3 monoplate tube. Inspired by the kismet 3 by fabio camorani, yet with different power supply and driver tube. Warranty information and return policy warranty period. The big question with these tubes has to do with compatibility with the amp.
Sovtek 2a3 is a close replica of classic american 2a3 tubes, excellent for classical sources. However, they carry a high price tag due to their rarity and demand. Sun audio 2a3 tube integrated amplifier audio illuminati. It is interesting to note that both of the tube dealers that i called have never heard of nx483s. May be its the warm sound produced by these tubes or because i like horn speakers and i know that this relation is erotic. This 2a3 singleended triode set tube amplifier uses a ef86 input stage and a solid state power supply. High voltage for the tubes uses a fullwave tube rectifier into a. Not only is the 2a3 s the little engine that could, triode lab is the little company that can. Without modifications, you just plug in this tube into any normal 2a3 amplifier, and tube and amplifuer will work at the normal 2a3 operating point. I was sent a replacement tube and while waiting, the other tube started making noise. Ua 450 v wa 40 w maximum plate curent of everage tube for fixed bias ia 70 ma maximum plate curent for manually.
Sadly, charlie kittleson passed away on february 10, 2009. The choice of input and driver tubes was made experimentally. All our tubes are guaranteed for 3 months from the date of purchase. Despite being relatively low powered, 2a3 still is the triode of choice for many highend audio amplifiers and diy projects. Thats how i wound up with some uncommon tube choices. When you intent to get the maximum out of a 300b, and operate this tube at the limits of safe operation, it is a better idea to use the 300bxls in such a case. Rca 2a3 tube 2a3 2a3 power triode triode pushpull class c tube amplifier power transformers rca tube 2a3 scans0017378 triode pushpull circuit rca tube text. Order electroharmonix 2a3 eh gold grid vacuum tubes online, in stock and ready to ship. Tube amplifier project page after restoring a nice old 1938 sparton model 1568 console radio, i was so impressed with the quality of the sound that i started looking into building an amplifier using the same 2a3 output tubes that the big console uses.
I looked at the tube specs and im not sure when i am reading them what are the important items. This is a new model which is designed to offer significant increases in accuracy over previous models that we have made up, or which have been referenced here. Then the replacement tube 3rd began acting up within a few hours. Vacuum tube valley vtv was a magazine produced by charlie c. Due to popular demand, a version for spice 3f4 compatible engines is now available for download. Legendary rare electube 2a3 tube fivre single plate top endtriode in box 1930s. The 2a3 tube was introduced in 1932, designed specifically for the audio amplifier output stage. Some of our competitors claims to be the only one with a center tapped filament, but at eml we build since many years all tubes center tapped, not just this tube. The direction of the 8pin octal tube sockets for 6sn7 match with the screen silk of the board as in figure 2.
Detailed and clear sound provides real musical reproduction. This one has a lot of pages from the european philips tube manual. This circuit is a classic 6sl7 tube wired in seriesregulated pushpull, driving a 2a3 directly heated triode for about 3 12 watts of output power per channel. Hi folks, i have no experience with tube amps so i would like some advice. Power tube selection charts for highpower audioamplifiers. They sounded great for 2030 hrs, then one started acting up. Stereomour ii stereo single ended integrated 2a3 amp. The 2a3 tubes are electrically similar to two 45s in parallel.
This kit employs commonly used triode 2a3 vacuum tubes in pushpull configuration. I have tried the amplifier with rca 2a3 s dual plate and shuguang 2a3 s. Vacuum tube valley magazine get the entire 20 magazine set. Nov 09, 2009 in my amp, the best sound 2a3s have been eml meshplates. In this project, the 2a3 power tube runs at a 60ma plate current with no signal applied and has a 410v plate voltage. View and download analog metric 2a3 user manual online. You can use in auto bias mode different cathode resistors, p. Then plug in two delicate 2a3 tubes and connect the output transformer as following block diagrams, either openloop or negative feedback. With the kenrad 2a3s mentioned in my above post i ended up using thinner sounding european 12at7s to somewhat balance out the sound of the fat sounding krs.
Find great deals on ebay for 2a3 tube and 2a3 valve. High evacuated tube, it achieve high performance tube in audio frequency. The anodes are connected to the primary winding, the cathodes to ground circuits 1, 2, and 3, and the middle of the primary to the highvoltage supply. Diy audio projects forum 2a3 amp modified for 45 tube. Low gain edition 2v input sensitivity with full suit of hashimoto sansui transformers, with max of 4. To view this site, you must enable javascript or upgrade to a. These tubes produce an enveloping soundstage and have a tonal balance that is a little bit fuller than typical 2a3s. Frank combined many techniques, resulting in a suberb sound quality. Bjt amplifier amplifier 2a3 audio amplifier class a amplifier swamped amplifier sensor amplifier power amplifier peugeot jbl amplifier dc coupling amplifier operational amplifier amplifier repair audio amplifier amplifier design amplifier mcq pdf download multistage amplifier tube amplifier tube amplifier design rogue cg30r amplifier class d power. The sex kit is cheaper, easier to build, and quieter than the stereomour.
Its better suited to your application, its better suited to the first time builder, and it sounds surprisingly good. Page 34 the next part we need to concentrate on the lm1084 regulators need to be installed on the board. The input stage of the stereomour ii consists of a pair of 12at7 tubes. Figure 1 shows several pushpull tube amplifiers only the power tubes and the output transformers primary winding. Unfollow 2a3 amplifier to stop getting updates on your ebay feed. Amplifier repair bjt amplifier amplifier tube amplifier sensor amplifier dc coupling amplifier amplifier mcq pdf download amplifier design multistage amplifier 2a3 audio amplifier operational amplifier audio amplifier peugeot jbl amplifier class a amplifier power amplifier swamped amplifier class d power amplifier common emitter amplifier. The 2a3 evo after ten years of revolution on the original 2a3i, we have settled with the finest hifi transformers hashimoto of japan. This product has a universal power transformer and can be used worldwide by following the wiring instructions in the manual. For other taylor tubes, see the entire 1945 taylor tube catalog in pdf format note, 1. Lafayette 2a3 tube tested excellent 6034 and plate current 64 no shorts, gas. If youre dying for a 2a3 amp, though, the spendier paramounts might be what you want. They are in white us military boxes and are penta branded. Download a pdf file of all 211 pages at once by clicking here.
Pure sense of space with all subtle timing cues intact make this a tube of choice for any 2a3 enthusiast and an excellent upgrade path for any exiting 2a3 based system. If you want to build a bottlehead kit, though, the news is good. I do not know why but i prefer simple, low power triode designs. Here is the story about my beloved, tiny hercules sun audio 2a3 integrated amplifier. This is the output of the filament board that will carry the 5v dc to the 300b tube. One half of the 12at7 is configured as an actively loaded voltage amplifier using our camille cascode constant current source. The circuit shown in figure 1 shows the complete power supply and one channel of amplification. No distortion cancellation going on here other than the pp 300b pair i tweaked each stage individually for the lowest possible distortion. The 2a3 s have more bass and slightly more power than the nx483s.
The reason being that i did not have these components when i started the project. The kr audio 2a3 hp tube is fully compatible with any well designed 2a3 amplifier and sonically delivers exactly what owners of these special amps expect, and then some. One half of the 12at7 is configured as an actively loaded voltage amplifier using our camille cascode constant current source for super quiet, dynamic, linear performance. Double triode ecc99 is a 9pin double triode usually used as a driver for directly heated power triodes i. This great amplifier is a classa, pushpull amp using a pair of 6b4g directlyheated triodes as the output stage. I know of a number of people whose amps cause very premature failure with this tube. My initial design already included a regular 1n4007 diode from grid to ground to prevent the 2a3 from going into class a2.
The 2a3s have more bass and slightly more power than the nx483s. Rca 2a3 power amplifier triode the 2a3 is a threeelectrode, highvacuum type of power amplifier tube for use in. I think the 2a3h was introduced with the radio but was available for only a short time. Two triodes can be used in class a and ab amplification.
This is our collection of diy and hifi audio schematics. The entire 1945 taylor tube catalog in pdf format note, 1. Cary audio design cad2a3si operating manual pdf download. They also noted excellent midrange imaging, and overall tonal balance.
This amp uses a pentode first stage dc coupled to a cathode follower to drive the output tubes, and no. Tubes with part numbers beginning with 2a3 tube are in stock and ready to ship. Version 1 uses two 6sn7s in the input stage, and delivers full output with around 300mv input. The direction of the 8pin octal tube sockets for 6sn7 match with.
I bought this unit in 20 when i was driving home from black sabbath concert in czech prague, previous owner liked it a lot, but he didnt owned appropriate speakers to make a good match with relatively low power. Well, ike persuaded me to choose the jj 2a3 40 tubes for my pbbuilt amp, and got them to me in two days along with a sixmonth warranty. Single plate 2a3 s were made by cunninghamrca, sylvania, tungsol and arcturus. Electroharmonix 2a3 eh gold grid datasheet pdf download adobe acrobat pdf reader. I chose the 2a3 directly heated triode power tube to implement the loftinwhite circuit. My speakers are diy cornscalas and my current amp is a wyred 4 sound sti integrated which is fantastic and is staying in my system. Single plate 2a3s were made by cunninghamrca, sylvania, tungsol and arcturus.
One set of variablesdesign will not be able to maximize the full potential of two different tubes. Just purchased a 2a3 seth with old electro harmonix tube, i want to update them. This is my first self made tube amplifier using directly heated tubes. We obtained over 150 pieces of these nos penta 2a3 tubes. This almost killed a pair of 2a3 tubes and made some very strange noises come out of my speakers. The prospective music customer is in the market for the vintage sound reproduction.
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