Crate GX-20M

[DaRedFox]

Hello there, new to the forum and thanks for the add.

I've got Crate GX-20M that has power but no output sound. I was playing on it and the sound was becoming intermittent, initially I thought it was my wireless, plugged in a guitar cable and same thing.

Threw it on a table for inspection and noticed the positive lead going to the speaker was dangling. Plugged it back it thinking it was the fix but unfortunately not. And now there's absolutely no sound at all.

I disassembled and inspected for any cold solder I can see but nothing, looked for any bulge or swollen or burnt capacitors again nothing. I checked the speaker with a 9v and it works.

I don't know what else to check. Any advice would be greatly appreciated. TIA.

[Tassieviking]

Try it with some headphones, if headphones work then it could be dirty contacts in the headphone jack or the external speaker jack, when inserting a plug in the headphone jack or the external speaker jack the main speaker gets disconnected.
Try running a plug in /out of those jacks to see if the main speaker comes back to life, if it does it is dirt in the other jacks.

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[DaRedFox]

I plugged a pair of headphones and can hear my guitar. It doesn't have an external speaker jack.
I sprayed some contact cleaner and pushed the plug in & out to clean them but still no sound coming out of the speaker.

[Tassieviking]

I have never seen this amp in person so I was going by the schematic and photos I have seen on the net, all the photos I have seen has 2 sockets next to the switch on the right front of the amp. The outlet nearest the switch is an external speaker jack and the second one on the right side is the headphone jack, I cant go any further unless I see some photos of the front and inside the amp of the PCB near the headphone jack.
The good new is that if the headphone outlet works then the amp should be ok but you most likely have a dirty contact or a bad solder joint somewhere near the headphone jack, just my opinion of course but that is where I would start. It could be the speaker being faulty as well I guess so if you have another speaker you can try that would be good.
I'm just a retired electrician who loves to build and repair amps and pedals and stuff so hopefully one of the many great technicians who are on this forum will be more familiar with this amp and will jump in with some more experienced answers.
Cheers
Mick