The last months my amp has been acting pretty weird. If playing heavy, or just loud enough on clean for about 40-60 minutes, it start making crackling noises and has sudden volume drops. At first I thought a tube had gone, but a amp technician has changed the tubes twice, and when I came back the third time, he gave up! He didn`t manage to get the bad noises him self, therefore not being able to repair anything.
So I now present to you, the terrible sounds it makes. And I exaggerated a bit, for example by using the octave pedal on the low B, just to provoke the amp to make the noise clearly. Sorry for clipping by the way, to high mic volume
PeaveyCrackle.mp3 ( 1.11MB )
: 3695
Does anyone have a idea what it could be?
Have you tried going on the Peavey forums?
If your amp tech cannot repair it, I suggest you find some other tech that can! Try asking around for people who fix these amps, it could be that some electronics went bad. I hope it's nothing serious man.
If he was not able to replicate the noises, could it be your house's electricity that is uneven?
I'd still say it's the power amp tubes. I had the exact same amp and the exact same noise (just a little less) when one of my tubes went bad.
Especially with EL84 tubes with bendable pins/legs it's important to add electric spray. Then jack the tube in and out a few times so the jacket becomes perfectly clean.
Try that as a last resort, since you got the tubes switched they should be alright. Surely there can be other less common reasons but that's what you have amp techicians for...
I wouldn't want to judge your amp tech, but are you sure he did a good job with replacing and biasing the power tubes?
i agree with th others either tubes , biasing or pins
Ever wonder why tube amps, have combos and head only options?
If it's a tube amp, they all do that when the tube is about to go (crackling or volume change). The harder you drive it, the quicker. If you don't replace it soon as it starts, it might explode damaging other components, I kidd you not! If the other components are damaged, it's sometimes cheaper to throw it away and buy a new one. That's the only reason I've been holding off getting one and avoid second hand.
I understand the problem mate, there are few amp techs in general, and you never know who to trust. It could be that the guy did a proper work after all, just want to include that option too you know..
I'm not an amp tech myself, so not sure, it could be anything. But those particular symptoms usually mean that power tubes are running out/bad biased.
Sometimes even the most complicated failure may be simple - the dust in the potentiometer, for example ..
Try taking out all the tubes and spray some contact cleaner in each socket. Then take the tubes, insert them, and rock them around gently. Spray some more contact cleaner and do this a couple of times. Be very careful, you don't want to weaken the mountings on the tubes. Once you completed this wipe down each pin on the tubes with contact cleaner.
The purpose of this whole procedure is to remove any oxidation or dirt on the sockets. Oxidation can form on the sockets after only a couple of years.
One more thing, do this when the amp is off and unplugged. Also, wait for the capacitors to drain their charge, this could take a few hours or a day. Capacitors can store lethal voltages, thats why theres warnings on amps. Its no joke, it can really kill you. Some amp techs recommend keeping one hand in your pocket while you're tinkering around inside an amp. This minimizes the chance of lethal voltages passing through your body.
I wouldn't worry about it too much, seeing how you're not messing around inside the chassis. But I thought I'd give you a heads up
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