Fender Super Bassman Tube Layout
Does anyone have specifics on the function that V3 (AX7) and V4 (AT7) serve in the Super Bassman? I'm guessing the AT7 is a phase inverter but what about V3? According to the block diagram, the loop is not tube buffered. Block diagram shows an out arrow from the autobias to V4 but not to V3.
Here's what I have so far:
V1 - First gain for overdrive channel, first and 2nd gains for vintage.
V2 - 2nd gain for overdrive channel
V3 - ???
V4 - phase inverter?
V5-10 - power