In one word Fantastic! My good friend Teajay (now the reviewer) has the 2A3 by Triode Lab and we both think it is excellent.
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Triode Lab makes excellent products. I own a pair of 45 monoblocks and they are really wonderful. And if you live in the U.S. their products are a bargain because of the exchange rate between the Canadian and US dollar.
If I had a comment it would be that these guys offer too many variations of the same product, but that's not necessarily a bad thing.
@joeinid The answer to your question depends on your ears. Some guys like the 300b. I'm not a fan. I like 45 tubes. Others don't. The 2A3 is somewhere in between. If I had to pick the best sounding SET amp I ever heard it would probably be an AD1 amp built by Thomas Meyer. It was an extremely seductive sound.
If you want more information, this guy has a great website: http://www.glowinthedarkaudio.com/thoughts-opinions.html
We have a small group of low power SET tube amps to use for demonstrating our speakers. The amps are designed for 45, 2A3, 300B, EL84 and GM70 tubes. The 2A3 tube amps are Triode Lab monoblocks. The 45 amps and Triode Lab 2A3 amps are our preferred amps for our system. The Triode Lab 2A3 amps are what we used at the last two audio shows we did and is what we are using at AXPONA (if it takes place). They are wonderful amps. We have no involvement with the company. We use their amps because of SQ, they are dead quiet and reliable. BTW, Frank is easy to work with. https://parttimeaudiophile.com/2019/06/28/the-return-of-the-arion-audio-apollo-system-t-h-e-show-2019/
The Triode amps we use are the 2A3M Canadian with a few upgrades. The upgraded including Hashimoto 2A3 power transformer, Teflon sockets, Cardas binding posts and better caps. I guess they are somewhere between the 2A3M Canadian and the 2A3M-FFX. There are several good tubes available. I prefer the EML tubes for our system.
Thanks, we think so :) A high sensitivity OB line array is a rare bird.