imo1 wrote: ↑Wed Apr 17, 2024 2:07 am I just finished the initial build of a single channel deluxe reverb, sans tremolo.
I'm using a classictone 40-18019 PT and the OT from a Hammond AO35....
The amp sounds fantastic up to 4-5 on the volume and it gets pretty hairy after that. By 6-7 the whole thing starts to really fall apart. It sounds like blocking distortion. I was a little surprised at this since the build already accounts for the lack of tremolo with a 330k and a 47k to ground on either side of the 220k mixing resistor, which should, in theory, tame the gain.
I would try a single 100k to ground after the original 220k mix resistor. A series cap isn't needed.
Well those are Fender's expected AC voltages, but the '65 DR schematic is a good reference for checking them.
If they are high, I would consider adjusting the two 10k power supply dropping resistors to get the PI and preamp node voltages (X and Y on the Fender '65 DR schematic) down to the levels with the tremolo and normal channel included.