Tube Amp Channel Switching
I'm implementing a channel switch for a small tube amp I'm building and need some help. Here's what I want to do:
Any ideas or schematics out there I can reference? Thanks, guys. :)
I make guitar amps, but I've never really been into the mesa boogie channel switching relay thing. Instead, I'll make separate preamps if I need them, and then use those pots with the integrated switch on the back. I'll LED bias the last stage in each pre, but like this:
Cathode ---> (+) LED (-) ----> Switch ----> Ground.
Resistors would work too, but you can panel mount the LED to indicate the channel is on.
If you turn the volume to "off" for a channel, the cathode gets lifted, and thus no sound. If there are two channels in parallel, you can get one or both. To use a footswitch, use a closed-circuit (shorting) 1/4 jack and have it swap the pot switch for the footswitch when the 1/4 is installed.
I generally use a floating or appropriately referenced filament supply, since the cathode will go up to B+ potential when lifted.
I hope this helps, it's the easiest way to implement multiple channels i've come up with lately (just used it in a big 100W with high gain & low gain guitar + high gain mic pre).
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