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Paul S wrote:

Seems like a good basic concept for a laconic PP amp, though...

The fix bias of  driver and out stages are fine. Why he need to have 1:8 input transformer. The driver stage does 32 time gain, the output stage does 3 time. Is it not enough?  Does he has his speakers with sensitively of 85dB and 2000 cub feet room? I think for the gain he made with 1:8 input transformers I think the amp will not have enough power. However, the biggest thing that I do not like in there is the PP concept itself. In this PP implementation the out tubes shall be match super prissily and it is imposable with 6C33C. Even if you do match them initially then the different 6C33C age with different tempo. The only way to use them in PP is to use automated base that make the 6C33C to sound like wet dog, courtesy to BAT and others. So, I am not so impressed with what this guy does. Still his use of 6E5P makes him deserved to be mentioned. I do not know what result he gets from this amp. Even if I was able to read his text then I would not believe that he say anything about sound. As I underrated he is from DiyAudio.com site and those people know only about soldering and measuring but they are clawless about Sound.

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