| Fender Princeton making strange purring sound
I recently purchased a 1970 Fender Princeton. The 10" speaker has been replaced with a 12" Eminence Patriot. Everything else is original. It sounded great in the store and I got it for a great price. I bought this for recording purposes as my Hot Rod Deluxe was just too much power for my small room. Anyway, the amp is making a strange sound very much like a cat purring, even when nothing is plugged in to it. It's plugged in to a good power conditioner, so I've eliminated that possibility. A friend suggested I leave it turned on for several hours, as it hadn't been used in some time. Didn't really help much though. This purring sound makes it impossible to close mike for recording. I'm hoping to avoid an expensive trip to my local amp tech. Any suggestions on what might be the culprit? Thanks for any and all help.
Larry |