transistor amp not working after shorting output

I would mount it in a case with a TS input socket.
You could add a new pot and wire it as shown above.
And a nice speakon connector for the output.

speakon.jpg
 
Change the jack!!

You have no idea how many blown power amps I have repaired over the years due to 1/4" speaker jacks. They short as you pull them out, and it isn't uncommon for them to come partially out - shorting. Speakons cannot short, and they lock on top of that.
 
The plugs are designed to short on the way in and out.

No problem for input sources normally. For output, high level signals, disastrous. Tube amps tolerate shorts better than transistors amps do, tube amps can really blow when run without a load.
 
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