Thank you, Doug. So-called grounded grid; what this circuit is, is a singly-driven diff-amp, and output may be taken off either plate (depending upon whether one requires inverted or non-inverted output), and circuit parameters adjusted to optimize the desired configuration. Your read of using the driven side plate resistor to adjust the gain (when output is taken off the non-driven side) is brilliant; I hadn't seen that. The Rosenblit/Transcendent circuit uses an active (SRPP) load on the output (GG/non-driven) side, but I don't have the voltage to spare. What I do have (in my project box) is a pair of Hummond 150H chokes, which I'm going to try this weekend. I now have the 6SN7 breadboard configured as a tranny coupled PP, so everything on the PS side is already there, the mod to the audio circuit will be simple.
Stay tuned.
Poinz
P.S. I have some tranny news, if you like; Post me.
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