User Reviews/Feedback for Sophia Electric 300B 2.5V Mesh Plate Tubes

Hello, I got the Sophia Electric 300B 2.5V mesh plate tubes in the mail today, replaced the NOS RCA gray plate 2A3 in my 845 amp. It is exactly what I wanted, 300B sound with 845 power! The mesh 2.5V 300Bs are less grainy than RCA 2A3 with great tone, timbre, and emotion. The vocal is excellent and much improved smoother and more detailed at the same time! Bass is real, not fake tight as SS amp but like real drums. Overall great tubes, I am looking forward to hearing more good news once the tubes are properly broke-in.

Best regards,

Griffin from Washington


It was a great pleasure to meet you at this year's NYNoise exhibition, but an even greater pleasure to have experienced your mesh plate 2.5V 300B tubes!! I am using them in my homemade 845 push-pull amplifiers. I used 2A3's (sovtek's) in the driver stage previously and, despite the fact that the operating point I use for the 2A3's is not optimized for a 300B, the improvement to the amplifier was absolutely stunning!! I'm not much for audiophile technobabble nor reviewer hyperbole, but quite simply, everything got larger, richer and more true to life...........everything that anyone values in their audio gear got better, and this using them only in the driver stage!!! I can only imagine how wonderful they would sound as output tubes in a Single-ended 2A3 amplifier........wait a sec.........I've BUILT a single-ended 2A3 amplifier!!! Gotta go now, I gotta fish out my SE 2A3 amp and my super sensitive speakers and try these bad boys out in it..........while I'm running them, perhaps I'll get around t adjusting the operating point of my monster amps for a 'more appropriate' 300B like voltage (300-330V) and see how they'll do in a more optimized environment.

In short, your tubes, although pricey, deliver a tremendous improvement Over any other 2A3's I've had experience with. As you know, I've already recommended them and caused further sales of them to other friends using 2A3 and 300B amps.............may your success continue, you deserve it.

PS When are you going to get your guys to build you a mesh plate 845:-() !!!!! When you do, put me first on your list for 4 of'em.............



I wanted to take a minute to thank you for the wonderful tubes. I have been using the 300B 2.5's in my Sun amp and they are absolutely the best 2a3's I've heard. They combine the beauty of RCA's with a more visceral low end. The mesh tubes are magic! I've also found the 274B to be a great rectifier. It seems to expand the soundstage and enhance detail. You guys are really doing some neat things at Sophia Electric.

Thanks for everything,


After the retreat I listened some more and then made a quick comparison with the AVVT tubes I had been using and I was pretty quick to realize that I preferred the Sophia Electric tubes. If listened to alone, the 2A3s I was using sounded just fine. In comparison to the Sophia Electric tubes, instruments and voices bled into each other, the soundstage itself was more of a blur, and the sound seemed somehow 'rougher'. The Sophia Electric tubes were airier, each instrument and voice was clearly dilineated in the soundfield, and there was a greater naturalness to the sound of instruments and voices (a guitar string with its' overtones, etc., intact).

Mr. Stew Glick, New York