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Amp won't turn on - any ideas?


Oedo 808
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Fuses.

Happens to our other guitar player (Napz) all the time.

His JCM 2000 blows a fuse nearly every week - needs to get it professionally fixed.

Wireless systems can also affect your fuses.

Temp fix is replacing the fuse - cheap and easy to do, but it might not prevent it from happening again.

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Wait, there's a fuse in the amp as well as the plug?

Do you know where he gets it sorted and how much it costs?

He does it himself - sometimes on stage!!!!

Yeah its under the cover at the very back about where the kettle point is.

Take the cover off and you'll see it.

the fuses cost 11 pence and you can get them from pretty much anywhere that sells that sort of thing. They are'nt specialist or anything.

cant remember the Amp of fuse........ but open it up and check the existing fuse, youll get the number off that.

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Yup slow blow fuses, you will get them from maplin. Main reasons for amps blowing fuses is valves. In the case of a jcm 2000 blowing fuses every week, thats definately a fucked EL34. Wouldn't waste cash putting it in to a pro, just get a new set of EL34's and a multimeter hooked up to the external bias points on the back and bobs your uncle, plenty of guides and vids on the net explaining how to do this as well.

Mr knight, be careful if your replacing fuses inside your amp. If its opened out watch what your putting your hands near as the amp can hold some seriously lethal voltages. Stay away from the big blue caps! :-)

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Guest Motleyal
Riffs Bar are quite reasonable for el34s, change the whole lot though and set the bias. its easy with a multi meter. just look up details on the net and check the setting in your instructions.
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  • 2 weeks later...

If I remember correctly you don't need to go inside the amp to get at the slo-blow fuse. It's in a little 1/2 turn holder on the back control panel somewhere. Is the VS not a Valve State amp and therefore would not have a power vavle in it so that would be ruled out. A friend of mine had VS years ago and it would play for about 15-20 minutes and then simply stop working. Took it back to the shop and no one ever found out what was wrong with it...strange. I changed his pre amp valve which still did not help.

Of course I'm going to say right now that I'm no amp guru, so the above blurb about the VS not having a power valve might be rubbish.

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no you are correct, if the VS is a valvestate amp, there are no power valves in the amp, just 1 pre amp valve which does nothing anyways.

I once opened up a marshall valvestate amp and turned it on, and the valve was getting no power to it whatsoever, so not sure if it just there for show or not...

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nope, was a totally fine working amp, i just opened it up to fix the input jack as it had fallen inside the amp, and yeah, turned it on and the valve wasn't heating up or whatever, think its just there for show.

Thats a behringer trick right there, one of their old compressors that was "valve" certainly had one inside it that you could see and yes, it looked like it heated up, but upon closer inspection, you realise their is an orange light behind the valve making it look on and warmed up, haha.

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