I added a couple of LED's to the footswitch for my Peavey Classic 50 to indicate reverb and channel status. A single LED for 2 channels isn't ideal, but better than nothing. Both the ring and the tip are at approximately -25V when the respective stomp switches are open. I simply wired LED and resistor pairs in series with the lines connected to the tip and ring and terminated at the respective switch. When the channel switch is closed the ring still has -12V, the LED is illuminated, and the Normal channel is operational. So far, so good. Then I tried the same thing with the footswitch for my 5150. In this case it is problematic. As with the Classic 50 Normal channel, when the channel select switch is open the Rhythm channel is operational. With a stock footswitch closing the switch grounds the ring portion of the jack and the Lead channel becomes operational. But with the LED and and resistor added something strange happens. When I first step on the switch the green Rhythm indicator on the panel lights up faintly for a split second and then it's back to the red Lead indicator being lit up. The controls for the Rhythm channel are operational (Pre, Post, Bright, Crunch) and the Pre and Post for the Lead channel are completely out of the circuit. However, there is increased volume and gain compared to the Rhythm channel engaged with stock footswitch (or sans footswitch). Unfortunately the schematic has not been helpful to me yet, I can't make heads or tails of the relay switching scheme as drawn. Is it possible its a non-starter with the 5150 and I just got lucky with the Classic 50?
peavey_5150_combo.pdfPeavey-Classic50-Schematic.pdf
peavey_5150_combo.pdfPeavey-Classic50-Schematic.pdf
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