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Tag Archives | valve amp blowing fuses

If your valve amp blowing fuses, there are a number of possible causes. If your amp blows a fuse, it’s almost always for a reason, so make sure you get somebody to investigate.

The most likely reason is a dead power valve – a 6L6, EL34, EL84 or 6V6.

Most valve amps with EL34s or 6L6s must be re-biased when (see bias page) you change the tubes. Some cathode biased amps can be replaced with a matched set without re-biasing.

Other possible causes of blown fuses in valve amps are valve rectifiers.

A short in a DC heater supply can also cause fuses to blow.

If you’ve got a valve amp blowing fuses, send me a message, I’ll be happy to take a look.

Peavey Classic 30 repair

Peavey Classic 30 repair –

This Peavey Classic 30 repair was a bit of a nightmare! It arrived with a fairly basic problem – the amp wouldn’t turn on. This was down to a loose screw. It held the mains fuse holder internally. When this came loose, the fuse holder was dangling in mid air and shorted mains directly to […]

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Peavey Valve King Repair

Peavey Valve King Repair – VK100

My customer brought this Peavey Valve King repair in to me before Christmas  to get an opinion on its state of repair. The amp was blowing fuses. The Valve King VK100 is a monster of an amp. Not fire breathing levels of gain like some Peaveys but a big and heavy brute with a classic sound. […]

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Marshall JCM 2000 Repair – TSL 100

Marshall JCM2000 repair I get quite a lot of the JCM2000 series in for repair – both DSL and TSL. I think it’s because they were so popular, rather than any endemic issues. This particular JCM2000 is a TSL100, the triple super lead model. I’m writing the blog post quite a while after the repair […]

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Marshall Repair JCM2000 DSL

Marshall Repair – JCM2000 DSL100

Marshall Repair This Marshall Repair was brought to me with one of those sneaky ‘hard to find’ problems. The amp was blowing fuses when the customer was playing it. He’d taken the amp to another repairer who hadn’t found any problems. Unfortunately the amp continued to blow fuses. Guitar amplifier repairs of this kind often […]

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