| Re: Buzz in Peavey Classic 50 tube amp [message #75375 is a reply to message #74841] |
Mon, 28 January 2013 18:08  |
Thermionic
Messages: 208
Registered: May 2009
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If the hum happens immediately after power-on, as soon as the tubes warm up enough to conduct, it's likely filter caps if it's a Classic 50. I've had to replace the caps in humming Peaveys and Fenders that were only a few years old. Granted, they belonged to players that practiced and gigged much more heavily than your average Joe, and therefore had more hours put on 'em in those few years than most amps see in a decade or more. But, their poor quality Illinois Capacitor power supply caps were nevertheless bad after only about 3 or 4 years.
If the amp is quiet at first but them hums after several minutes and gets worse after the amp's been on for quite a while, it's probably a bad power tube.
| Shane wrote on Sun, 09 December 2012 20:34 | Another issue might be the input jack on the amp itself. Bad solder joints could cause it.
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Peaveys are notorious for cold wave-solder joints on the PC board. I've fixed a bunch of 'em. They're often only visible under magnification and strong light.
Thermionic
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