Amp footswitch problems

[oversight_failure]

I just made a box to control the reverb and equalizer on my Mesa Studio Pre.  I first ran a stereo cable out of the amp and used some wire to figure out what was what.  I then wired it all up.

Here's a drawing of how it's wired using two DPDTs:


The problem is that there's a distinct hum coming from the amp when I plug it in.  It does switch correctly, but there is a loud pop each time I press the switch.  I used the same kind of switch to control the rhythm/lead channel and there is no hum or pop.  When I unplugged the pedal with the amp on, it popped and then the hum went away.

Any ideas?  Is there some sort of ground problem?

(btw, hi)

[niftydog]

The switches are correct, but the drawing of the stereo jack is very ambiguous. Just double check all your wiring again.

The socket itself may also be a switching type, as the reverb line is active when open circuit. That's a strange one if you ask me!

Another trap is when you don't quite insert the plug all the way into the socket.

[oversight_failure]

Thanks for the tip.  I took the dremel to the case to eliminate the ridge the stereo jack was resting on.  It still made noise...then I discovered I had wired the ground between the switches incorrectly.  It was shorting the EQ to the Reverb when the reverb was activated, causing a hum and loud pop.  I'm fixing it now.  Hopefully this does it.

[siaoguitar]

Hi, i need a footswitch for my church's amp( yamaha GS-100), wondering if the diagram can be used for me to switch from channel A to B and vice versa?

Pls help..i have 3pdt switches, can use right? with LED?