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Weird Noise In Old Marshall

6/22/2000 3:46 PM
Weird Noise In Old Marshall
Hi Everyone, here's the deal: I have a 75 4 input 50 watt that I'm working on for a freind. The wiring has been messed around with (new preamp caps),new filament wiring (not twisted), stuff moved around. Anyway, I put a lot of it back to stock but the amp makes a loud vibrating/rattling sound when cranked up and sustaining a note or chord. It sounds just like something behind the amp is vibrating like crazy but the sound comes thru the speakers. The filter caps are original, could this be it? It also seems a little like a parasitic oscillation. Any opinions are welcome-  

Kremator I'm not an expert, but i'd try swap... -- 6/22/2000 10:35 PM
Carl Z Here's a few more thoughts. When p... -- 6/22/2000 10:56 PM
Stephen Conner Are you sure it's not your speaker ... -- 6/23/2000 4:33 PM