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I thought the B1 was Yamaha's V-FET and the B2 was a later "hybrid", but I suppose both are Vintage Sufferer's wet dreams.  I have never heard either amp, anyway.

Yamaha B1 and B2 conceptually the same amp. B1 is made only with one polarity V-FETs and B2 with complementary plus and minus V-FETs. B1 has more power and does not have the sexy meter of B2. I have no idea how different the in sound. My B2 is virtually new but 30 years old. The signal switches practically do not work and need to be replaced. I did not open it, have no manual or circuitry. The guy who sold me the amp forgot to put any papers in the box and he will ship it to me next week. I use it as it is. I do not know if I will keep it.  I like the idea but it shall show some sound that I might find at least promising. The upper rage of the amp is fine but the bottom is desisted.  I do not know if it is how it shall be.

If I keep the amp and find why I skew up the whole bottom then I will start a new thread.

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