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I'm pretty sure it is something in the reverb path. The amp I'm working on has the sock 6EU7s and 6C4 reverb tube. All test good but I have now way of testing for microphonics. What happens is when you are playing you get a high pitched note that just sticks. It isn't a squeal or a not that osilates just stays at a certain high pitch. Turn the reverb off and all gone. I've alreay done a good bit of trouble shooting and can't find this one. Got any ideas?
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Demount the reverb pan and move it outside the cab as far as cables will allow. Does that change things? We are thinking acoustic feedback in the pan.
Inspect the pan. Are all the long springs intact? Are the four small corner springs intact?Education is what you're left with after you have forgotten what you have learned. -
Yes sir you are right on the money! I put some foil tape on the holes and it sort of did the trick but I want he permanent fix. Thanks agian for the great help you always provide.Originally posted by Enzo View Post
Should I foil the bottom of the card board on the pan or are the springs just to word from the years and need a pan replacement?
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Cut a piece of cardboard the overall size of the pan and tape it over the open side. If the pan is not in a vinyl reverb pan bag, get one.
Do a search here for reverb feeding back. We have discussed this repeatedly, and recently too.Education is what you're left with after you have forgotten what you have learned.Comment
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Cool, thanks for the info. There was a cardboard piece under it already. I put some foil tape on the few open spots for a quick fix and will tell my buddy to get the vinyl cover. Thanks again man.Originally posted by Enzo View PostComment
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Also, it is important that the pan NOT be screwed down tight. The screws should only be in enough to keep from falling out. The pan should float.Education is what you're left with after you have forgotten what you have learned.Comment
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