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Lucian,

here is where the beauty of 7788 comes - max Gm with absolutely lowest noise ( the area where Russian tubes reportedly can hardly compete). What is particularly cool about 7788 that that are dead quiet one after another. I have near ten different 7788 brands all of them are dead quiet.

What you said is very interesting: “… there is no known correlation between Gm and sound quality…” This is a whole big subject. With transconductance of 55.000 in one stage and with very low signal from MC cartridge or a microphone where would be a virtue of “sound quality”? Will two gain stages of half transconductance be inherently inferior juts because it will have one more active stage? It is hard to say.

I have Dima’s designed 7788-7721 phonostage with 65dB gain in juts two stages. It is very good; would it be the same if it were 3 stages? I doubt. BTW, the 7788 is very sensitive to the “quality” and type of screen voltage, sometimes I will play with this subject more.

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