2a3 tube types
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Content:
- List of vacuum tubes
- 1PC Psvane Acme Series A2A3 Vacuum Tubes 2A3 2A3-T
- Tube DIY Asylum
- Comparison of the Big Boys? - 2A3, 805, 211, 300B, and the like
- 300B vs. 2A3 vs. 845 Intergrated Tube Amp. Thoughts and Comparasion for Next Purchase.
- 2A3 - The Mother of High Fidelity
- JJ 2A3-40 Tube
- 300B/2A3 SE POWER AMP KIT [ TU-8900E ]
List of vacuum tubes
One of the finest sounding statement quality stereo 2A3 tube amplifiers money can buy. Please realize, that building this amp takes up about 3 months of my attention and several hundred hours of actual build time. I could get paid more by working at minimum wage. The result I get, however, is so worthwhile that I will continue to offer my expertise on a very selective basis.
It is specialized in what it does but what it does do is performed at the highest audio level possible. It takes about three months to build this incredible amplifier and the two slowest items involved are the chrome plating for the top plate and obtaining the Hashimoto transformer set from Hashimoto in Japan. This is definitely not a production item nor will there ever be a lot of them built. The pair of 6SN7 tubes are selected to match each particular audio system depending upon whether you need complete linearity or an emphasis in a particular frequency spectrum area.
My labor cost will be negotiated with a new prospective client and is definitely a serious value when you find out how many hours goes into building this amp. I have one, love it, and know that it provides the absolute best sound quality possible in audio today. I do not believe that there is a higher quality level obtainable.
Staying as close to the first watt of power and using a world class high efficiency speakers system results in a truly fulfilling and extremely unique sound quality. My additional requirement before accepting an order is that the new owner is capable of and will provide a serious and honest review of this amp. I want that new client to have owned and listened to other amps to be able to appreciate how good this 2A3 amp sounds in comparison.
It does but that will not be obvious without prior tube amp ownership experience and hence my unique requirement. If I was able to efficiently allocate my time and not waste a single moment, it would take at least 2 full time weeks to build this amplifier and probably well over hours. However, CNC machining, chrome plating, hard coat anodizing, custom painting, parts ordering is a waiting game and it literally takes about 3 months to complete all of the tasks to accumulate the necessary finished parts and to build this amplifier.
It takes a huge amount of patience and the labor investment is intense. Also, there is considerable testing that is done once the build is complete and then a proper listening and burn-in process that follows.
I cannot imagine any company building this high quality an amplifier and expecting to make a lot of money. I have no interest in doing this in any other way.
The Hashimoto transformers that I use are able to be used for at least 50 years before needing repair, re-building, or replacement. The market for ultimate quality is small. It also is not one where money making and profitability can take the front seat. Instead, money should be the least consideration. Yes, but not the proper way to create this kind of archival vehicle. Money is only required to purchase the proper grade of parts and to pay for even though not enough a reasonable amount of time involved.
There are a number of ingredients that must be present and included to make a 2A3 tube amplifier one of the best reference examples available: Most audio components today are build to last for only 3 to maybe a maximum of 10 years of use.
Instead, quantity and low cost appear to be the most ordinary goals. My foundational goal for this custom 2A3 amplifier is to provide decades of use for as many generations of people as is possible. To make that possible, however, there will be times during this period when electrolytic capacitors will need to be exchanged for new ones. I have, however, used a printed circuit board to wire the two 6SN7 tubes. A good technician can probably do this at least once.
Also included, will be a detailed PDF format layout showing all connections for this amplifier. Anyone can follow the wire connections and parts connections and can in fact use this layout to build a new 2A3 amplifier from scratch.
I have no problem sharing this information. If someone wants to copy my work, they should be given the chance to do it correctly rather than messing something up. Go right ahead if you like. It is extremely time consuming to build this amp and the parts quality and chassis design are such that just at raw parts cost, this amplifier is already maxed out from a price standpoint.
If you want to make money, you would be better off using the cheapest parts and having the amplifier built in China but even their labor rates are going up. By including two blank printed circuit boards with this amplifier, I have built in a serious amount of longevity and will have accomplished my original goal: to build an amplifier that will last for at least 50 years of use and provide the highest possible sound quality. My circuit design is one of the best available.
This provides a more analog quality of sound as compared to DC where its could be likened more to digital sound quality. I will provide the new owner of this amplifier with a detailed layout of all wiring and parts used for this amplifier including the parts manufacturer and all values. This amplifier has been designed around all Hashimoto transformers and they are the foundation on top of which everything else depends. These transformers are some of the best sounding ever made and are constructed to provide at least 50 years of useful life.
Yes they are expensive, but they are so worth it! Only when these transformers finally wear out will the lifespan of this amplifier have reached its ultimate goal.
All resistors are super high quality so should last much longer probably as long as the transformers. I suggest replacing the printed circuit board after one set of electrolytic capacitors has already been replaced. Other than raw output power, the sound quality of this amplifier will not be able to be exceeded.
If power is increased by parallel circuit design, etc , sound quality will suffer. Many high-end amplifier manufacturers today use all printed circuit boards for their tube amp designs. They do this to reduce labor cost so they can obtain a profit. Is point to point wiring better? Sometimes yes, and sometimes no.
When a tube amp builder mounts all tube sockets on a printed circuit board, there is no doubt that this is for the sake of lowering cost and increasing profit margin. The rectifier tube and the 2A3 output tubes all put out a huge amount of heat.
When they heat up, the solder joints are expanded and when the amp is shut off, the tubes cool, and the solder joints are contracted. This heat on, heat off, situation gradually destroys the solder joints and before they fail, the sound quality gradually deteriorates. This is a known fact and is the main reason I will not use a printed circuit board and even worse, solder tubes sockets to a printed circuit board for the rectifier and the two 2A3 output tubes.
This is the only place in this amplifier where I recommend using a printed circuit board and it makes good sense, but only here. The strength of these pins is substantial and the care and soldering procedure that I use to solder these sockets to the printed circuit board provides a superior socket connection and superb longevity for this section of the amps circuit. I use all point to point wiring everywhere else in this amplifier!
They definitely are worth the extra cost. Anyone who builds tube amps or who understands them well realizes that the 1 item to spend the most money on in a tube amp is on the output transformers.
You will realize the greatest improvement of the sound quality through this single item — much more than anything else you can do to your audio system!
There are others that are good too but those two build the best output transformers as well as power transformers and chokes. When you select a transformer set for an amplifier, it is best to use transformers all from the same company. There is a synergy that is designed by Hashimoto when all transformers are built by them. However, these guys are disappearing fast and in the not too distant future, you will no longer be able to order new tube transformers from Hashimoto.
This is a unique and dying art form and if you own a set of Hashimoto transformers, consider yourself blessed. The output transformers in this amplifier are the 20W, H However, it makes a huge and positive difference.
Prior to using this 20W output transformer, I was using the Hashimoto 7w single ended transformer. When I installed the 20W version, I was immediately amazed at how well these bigger transformers provide better body and an extremely realistic sound quality.
I can no longer go back to the 7W units even though they are very high quality. There is no comparison. The 20W, H The CW choke is probably a better made and better sounding choke than what other manufacturers offer. There are manufacturers in Russia that will only use the Hashimoto chokes in their amplifiers.
They consider them the best and who am I to question that? Prior to using Hashimoto transformers, I was using custom wound Electraprint transformers. The Electraprint were too bass heavy for me. The Hashimoto are extremely well balanced. The frequency spectrum for the H The Aum Acoustics chassis is extremely robust, precision CNC milled down to the last th of an inch, and provides a long-term value unlike the typical thin cheap chassis used for most audio components.
The majority of components use thin cheap chassis material. They try to make the front plates look nice by over-engineering them but the overall chassis is still cheap, thin, and vibrates like crazy thus reducing overall audio quality.
Even my beautiful looking Auralic Vega has a cheap chassis hidden by an elegantly designed front plate. Unlike these typical vibration prone audio boxes, the Aum Acoustics 2A3 amplifier chassis is extremely well but and beautifully executed, every single millimeter! A cross section of a side wall from this chassis is shown below. The height of this side wall extrusion is 2.
In this manner, there are four screws in total attaching the custom aluminum plate that I create. There are four screws holding the capacitors in place. In has been discovered that when expensive film capacitors are allowed to just hang in space, that sound quality suffers. Gone is the top-end roll-off and bottom-end bloat, and the level of detail resolution is unheard of in a PIO.
Thankfully, the special naturalness and ease of a good PIO remains intact. Actually even more so, since there are no strange frequency response aberrations or quirks in the sound to distract the listener.

1PC Psvane Acme Series A2A3 Vacuum Tubes 2A3 2A3-T
Directly-heated triode tubes, B with rich midrange and heavy bass, and 2A3 with delicate expression and gentle tone, both enjoy an enduring popularity among audiophiles. These 2 tubes with similar appearance but very different characteristics can be used in TUE without making any special change in the setting. Nowadays many manufacturers are producing various types of B and 2A3 tubes so users can enjoy same model No. However, since their filament voltage and the operating points are totally different, the supply voltage needs to be adjusted when using these 2 tubes in a same amp.
Tube DIY Asylum
Log in or Sign up. Steve Hoffman Music Forums. Thoughts and Comparasion for Next Purchase. Location: Northwest, USA. Hi was wondering if you can share you're knowledge and experiences with any or all of these amps that I'm looking forward to acquire as my secondary amp. This project is going to another room which is a bit smaller 16 x 16 feet and well call this all starting from ground zero. No amp, no speakers yet just files of music which is classical, strings, horns, keys and brass. Even on a low power setup, atleast I would like to have a tower speaker if I can and atleast just 1 output tube per channel for it might get too hot in that room in no time
Comparison of the Big Boys? - 2A3, 805, 211, 300B, and the like

Hi Alex, Interesting article. I Have some white label, double plate, 2A3 octal. I think it must be Suguang, but there are no signs on the glass. Just only '2A3'.
300B vs. 2A3 vs. 845 Intergrated Tube Amp. Thoughts and Comparasion for Next Purchase.
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2A3 - The Mother of High Fidelity
By laurenc , October 2, in 2-Channel Home Audio. No flames please, I already have two pp tube amps and on ss power amp and like them all for what they can do. Very good with jazz and plenty of volume. These amps are sensitive to tube selection both driver and output which further complicates describing the sound. Wish I could help you with regard to this question of B or 2A3. I think the same about this as all who have responded, but only have experience with 2A3 and 45 triodes. I'm doing some modifications to one of my 2A3 amps right now so it can be used for Bs, but I'm not doing this with the expectation that I will prefer the sound to the 2A3.
JJ 2A3-40 Tube
Special Tube Lists. Audio Preamp Tubes. SND Tube Sales.
300B/2A3 SE POWER AMP KIT [ TU-8900E ]
One of the finest sounding statement quality stereo 2A3 tube amplifiers money can buy. Please realize, that building this amp takes up about 3 months of my attention and several hundred hours of actual build time. I could get paid more by working at minimum wage. The result I get, however, is so worthwhile that I will continue to offer my expertise on a very selective basis. It is specialized in what it does but what it does do is performed at the highest audio level possible.
Scarborough Toronto, Canada. Full suit Hashimoto Trans with custom specification power transformer. Short and accurate signal path for the most organic music replay while sustaining durability and reliability. Options: High gain version 0. Limited Production due to the short supply of Hashimoto Trans, with a minimum of months wait time. More angles from: Soundstage Network. After hooking them up to Avantgarde Duo Omegas, I turned them on to warm up.
Our country back then was not a good place for music lovers well, not only for them but that's another story. Neither music nor audio equipment were widely available at the time. My first audio device was a simple cassette player with integrated tuner made by Grundig.
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