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I have an 11 year old Ampeg SVT-3 PRO that has stopped working in the middle of a gig and started making a continuous high pitched noise. Opening up the amp one of the resistors has burnt out. On the power amp schematic diagram it’s R8 (2.21K 1/2W 1%) between V1, V2, Q1 and Test Point 7. I...

I have had a SVT-3 for 2 years and am very happy with the sound and it is easily loud enough for me. The problem is the graphic eq sometimes switches on and off repeatedly on it's own, causing the sound to go louder and quieter, and the eq light flashes on and off. I have the eq level at...