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Re: Marshall Cab Connections
Hi ciderman... It may well work, but I wouldnt advise it. The amp may have problems driving less than a 4 ohm load, which is what you will have if you connect the 1960 in stereo mode with the combo's speakers. This may cause an expiry in peak moments of a face blistering shred :)
Try just the quaddy with the combo. Dont worry about the internal speakers, the vintage celestions used in the 1960a are gonna rock all over the factory fitters in the combo. AND its gonna be so loud anyways with the quad, you wont need the extra speakers.
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Firstly, do not disconnect the speakers from the amp when it is on. Damage is possible.
You have a bad ground somewhere in the hookup. The first suspect would be your guitar-to-amp cord shielding connections at each plug, then, the wiring in your guitar. Try changing each of these to another as a trial, one at a time.
Did you already open the amp? Can you send me a closeup picture of the PCB?
Is there any relay? I wonder how the signal is switched between the two pre-amp channels: Either there is a relay (I think so) or the signal is switched directly via the switch on the front. I dont expect optocouplers or switching directly in your footswitch.
So check relay and switch with a circuit / continuity checker
Since you are getting some output, the amp section is probably OK. There are circuits designed to handle thge difference impedence outputs. This should be a relatively simple repair for any shop that handles these units. If you don't have one local to you, let me know and I'll locate the service info and get you more specifics.