I have two Randall Rg100 heads from the 80's and they both have the same problem. When I put the gain controls more than half-way there is a horrible high pitched squeal. I can't get the distortion or the volume that I used to get with them. Any ideas would be great. They used to be really cool amps and I'd hate to get rid of them.
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Randall Rg100 head gain problem
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