F-30 Howl sound

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AshyLarry

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Joined
Sep 8, 2006
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Location
Farmington NY
Hey guys, I have a F-30 combo that has a howl noise. I only get it on the dirt channel when I either crank the gain to max or get the gain near max, and then crank the mids. I just installed a set of JJ's from eurotubes last night and I still have the problem. Any ideas as to what it could be?
 
Bad Preamp tube. Start with V1 (the tube hardest to get at) and take the shield off and tap lightly with a pencil. If it starts weirdness thats your tube. Repeat if needed.
 
I had the problem for a while, and replacing all the tubes with new JJ's didn't help it. So I tend to think its not the preamp tube, since they are all brand new. I did not clean out the sockets though. Would that cause it possibly?
 
I wouldn't think so, cycle through a power-up/shut down a couple of times see if that stops it.
 
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