I Finally got back to finishing up my Super Reverb re-build. It sounds fantastic, and dead quiet.
However the trem is not working. I checked all the wiring, component values, put in a known good tube. Of course I shorted the footswitch jack to ground since I don’t have a footswitch. The bias is a bit low. With 422 on the plates 70% would be 49ma, I’m maxed out and have 35ma, which shouldn’t be an issue.
I swapped in a known good roach, double checked the orientation, removed C20 as per Fender’s original schematic. All voltages are close, except the bias. Fender says -52, I’m at -42 and the bias is still low.
Color me puzzled. Troubleshooting advise is appreciated. Pic just for fun.
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Well I figured it out…
I had a .01uF cap where a .02uF was called for. Once I found that and swapped it out, the trem worked, but was too fast. I then swapped out the .02uF for a .047uF and then a .1uF and it’s under control. I now have a very cool slow swampy trem, but the range is good so I can get to “Crimson and Clover” speed just fine.
Kudos to Andrea for these great quality boards. I pulled several components out, cleaned up the pads and resoldered without any issues. I was concerned that all this rework would damage a pad, like it would on a Fender PCB, but no, they’re perfect. Thx
Well, I wasn’t exactly correct in the voltages. V5b cathode is only reading 4.6v where the schematic says 17v. I double checked all component values and I don’t see any problems there. The light on the roach lights up but doesn’t oscillate. Color me puzzled.