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In Reply to: V2 jumpers posted by Wellfed on June 5, 2005 at 15:41:55:
All 8 pins of the octal triode are in use. V2 is the cascode tube in a "dual-differential cascode" topology. In this topology, the cathode of the cascode is directly connected to the plate of (each) tube in the dual-differential pair that forms the "bottom" half. Then the plate of the cascode tube is connected to B+ via the plate resistor. When you bypass V2 or the cascode, you are in effect directly connecting the plates of the dual-differential pair to the respective plate resistors and B+. The grid(s) of the cascode tube sections are held at a fixed bias voltage by the action of zener diodes between ground and B+. Since you will remove V2 physically, this is of no consequence. The two additional pins are for the filament supply. The 6SN7 is a two-section tube with two grid pins, two plate pins, two cathode pins, and two filament supply pins. (One filament circuit lights both halves of the tube.) I hope I have not contributed to anyone's confusion.
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