mr_wetland
Well-Known Member
About 3 years ago I picked up a 500c off CL for $50. Naturally I was very excited but being a newbie on a tight budget I left it alone for a while. Little by little I learned more, picked up some coupling caps and a rectifier, then four new EH 7591's. About a year ago I put in the caps and new resistors as suggested here on AK, then I let it sit because I didn't have a variac and didn't want to blow anything up.
Fast forward a year, I've been rebuilding an old guitar amp so I finally made myself a dim bulb tester. Once I got that going I took the Fisher out and slowly brought that up. I started with a 25w bulb, then went 50, 75, 100, 150 and 200. No smoke, no sparks, no burning smell, no magic smoke. All this over a three day period. So I thought I was ready to plug it in. Hooked up a cd player to aux, and turned her on. After 30 seconds three of the four 7591's were red plating. Please, where do I start looking? I'm new to hardcore diagnosis. I am really disappointed...
Fast forward a year, I've been rebuilding an old guitar amp so I finally made myself a dim bulb tester. Once I got that going I took the Fisher out and slowly brought that up. I started with a 25w bulb, then went 50, 75, 100, 150 and 200. No smoke, no sparks, no burning smell, no magic smoke. All this over a three day period. So I thought I was ready to plug it in. Hooked up a cd player to aux, and turned her on. After 30 seconds three of the four 7591's were red plating. Please, where do I start looking? I'm new to hardcore diagnosis. I am really disappointed...