Hope someone can help. When I power this beast up it works fine for a few minutes and then I start to hear a "roar" like the reverb spring is moving. I can cut some of it out by adjusting the bass. Turning the reverb all the way down has no effect so I'm not sure it's a reverb problem. Nothing gets hot and amp plays fine but it has that annoying roaring sound. Any suggestions?
Thanks.
Thanks.