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JCM2000 DSL100 No Sound

It all started during rehearsal last week. Sound just quit after 2 sets. Found the speaker wire was shot. Switched it with my own good cabe and she worked for the rest of the rehearsal with no problems.

A week later, rehearsal time again and I hook everything up. tubes are all lit - glowing warmly and I have full power but no sound. I try my own speaker cable again - no sound. I fiddled with the vol knob and got a split second of sound - then nothing. Try another speaker cabinet - nothing. Hook up another head - and we're good to go. There is no crackling or poping when I fiddle with wires or knobs.

I'm going to check the fuses, but how can power be getting to the amp as a whole if the fuses are gone? A poor speaker wire would make sense as the start of my problem. I hope it's just a fuse.

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Not likely to be a fuse. The bane of electrical amps are the connectors.

Often the speaker and more commonly the input 1/4 inch connectors go bad. Sometimes caused by side loads when cables are yanked or tripped over.

Be careful of running amps IF the speakers are not connected OR have bad connectors or cables. You can arc over the tubes or pop transistors.

Get a cheap Volt-ohmeter from HarborFreight or Radio Shack and test your cables and connectors.

For a tube amp, your should find relatively low resistance at the speaker connector (certainly under 20 ohms). Do this with power off.

Posted on Sep 09, 2009

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