Tweedle Dee PI

[Schmirleroo]

Hey there..
Couple of quick question concerning the Dumblized Deluxe.
What is the reason for the series resistors (33K and 56K) in the phase inverter?
I see its being fed from a 10K balance pot roughly 6.5 and 3.5 (ish)..
Why not a 10K feeding the .1uF and a 95K tail? (Which seems high)
Love all the work here guys
R

[pompeiisneaks]

That's the Phase Inverter balance pot. Dumble found the optimal point in the circuit where pulling the cathode side of the Phase inverter could be optimally balanced the way you want for the amp. He also tweaked the anode and cathode resistors. The original had 56k top and bottom, he did basically very close to 110k top and bottom if you add up the entire path, but he pulls the output of the cathode after the 4.7k and somewhere in the additional 10k. This allows you to fine tune the output at the cathode to be where you want it in respect to the anode.

~Phil