Discuss the stuff that makes your ears bleed.

Moderators: Slowy, Capt. Black

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BY Jim.h
Hello all!

Ive been playing tube amps for years and have never had any problems at all! so this is a first.

When im playing my orange rockerverb, it has sudden drops in volume. just for a moment or two and then comes back to normal.

Could this be a power tube problem?

I live in hamilton. Was thinking of taking it into the rock shop for them to have a look (worry about their competence) I know the great John Gilmour is retired.

Does any one have any suggestions on what I can do?

Sure google can help, but where is the fun in that?

Cheers guys!
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BY sizzlingbadger
Could be any tube, get a known good tube of each type and test the amp by replacing them with the good tube one at a time to see if it helps. I'd start with the power tubes as they are more likely to cause this issue.
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BY chur
My Jet City did this when one of the EL84's in the power section started red plating. You could see this watching the tube when the volume was dropping as it glowed. Guess you could swap tubes, or find someone with a tube tester.
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BY Olderama
Yep swapping tubes is a good start :)
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BY olegmcnoleg
I'd start with the power tubes, they tend to be the ones to go...(especially EL84s, from experience). You will need to replace them in balanced pairs of course, or find a replacement with the same bias as the bad one.
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I'm not sure if it's been mentioned in this thread before, but I'd start with the tubes...
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BY GrantB
Not sure if John is retired...but I haven't seen him in a few weeks.

Check the power tubes...

But in seriousness, could it be an input not touching properly briefly? A bit of electric spray in there?
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I'd start by putting it in the bin and getting a katana.
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BY Single coil
My amp was cured of this by finding the dodgy patch cable and replacing it.
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BY Single coil
If it’s blue and cloudy then yeahp!
BY tubeswell
Loss of output power is often a symptom of failing output tubes. Output tubes wear out faster than preamp tubes and need replacing more often. Some output tube types (e.g. EL84 and similar miniature envelope pentodes) wear out faster than others.