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Marshall JCM800 Bias Problem

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  • #16
    Originally posted by gibson17 View Post
    Do I need to change the giant caps that hang down next to the power tubes by the tranny?
    When the amp is working properly you should be able to tell if the big "filter" caps aren't doing their job. Obvious problems like bulging ends, stuff leaking out, excessive hum or a short that causes other circuit problems are usually present if the caps are failing. On an amp that age with original filters I would inspect them very close. Actually, I'd probably just replace them. If the amp isn't giving you trouble and there are no physically obvious problems you can let it go for now and deal with it if/when something fails. I wouldn't, but you can. A lot of people do. I'm not in the camp that thinks really old filters are fine as long as they're working, but many here are.
    "Take two placebos, works twice as well." Enzo

    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

    "If you're not interested in opinions and the experience of others, why even start a thread?
    You can't just expect consent." Helmholtz

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    • #17
      Thanks Chuck. Do you have a good source on the caps? I was thinking Tubes and More (AES). Maybe you ore someone else knows of a good cheap source. Quite a oxymoron there with good and cheap together!

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      • #18
        Nope. But I'd be interested also since I have a personal Marshall I need to recap (some day ) and educated info on what's good in 50/50 cans is hard to come by.
        "Take two placebos, works twice as well." Enzo

        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

        "If you're not interested in opinions and the experience of others, why even start a thread?
        You can't just expect consent." Helmholtz

        Comment

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