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Power filter caps Carvin Legacy amp

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  • Power filter caps Carvin Legacy amp

    I have just bought a Carvin Legacy amp. I knew it had some problems, but it was ridiculously cheap so I thought why not try to get it back to life.
    It appears to have bad power filter caps according to the hum frequency and everything else checked and re-tubed and biased.
    My experience with filter caps are small and the only thing I know is that it's important to discharge them first. I need a bit help here please.

    These two caps are 82uf 500V each. I can't find caps with this value anywhere so the option I have is F&T caps which someone recommended me. I believe I can get these with 100uf 500V each and with almost the same dimensions.
    Is it ok to use a larger uf value?
    Do I need to change other caps or resistors because of the higher uf value on the caps or is it maybe a good idea to change these anyway?
    I was thinking about the two smaller ones next to the bigger caps and the yellow one? What do they do?

    Here are som pictures:
    https://pasteboard.co/J0qWqjA.jpg

    https://pasteboard.co/J0qWI5j.jpg

    https://pasteboard.co/J0qWYJv.jpg

    https://pasteboard.co/J0qX50d.jpg

    https://pasteboard.co/J0qXbJj.jpg

    https://pasteboard.co/J0qXiuY.jpg

  • #2
    I would order some Vishay MAL215959829E3
    82uF 500volt snap fit.
    Not sure where you are but RS part number is 825-1603 or for Nichicon LGN2H820MELZ35 RS part number 851-2113
    Many suppliers keep them. Mouser etc.
    It is always best practise to fit original values.
    Support for Fender, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk

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    • #3
      no problem with 100uF,the other smaller ones are for the preamp,once you have changed the main ones its better to energize the amp with a variac or a simple bulb limiter to reduce the high voltage for the first minutes,then go full voltage.

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      • #4
        ^^^^^^ and just to add,no you would not have to change resistors , caps because of using a higher uf

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        • #5
          100UF is absolutely fine. Many of the vintage amps had 30% tolerance caps. This is well within reasonable range. It's not lab equipment.
          "Yeah, well, you know, that's just, like, your opinion, man."

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          • #6
            Thanks for the replies! appreciated!
            I think I will go with two of MAL215959101E3 from Mouser. These are 100uf and the correct dimension 25x35mm. No 82uf cap is in stock.

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            • #7
              They will be fine and more convenient as they are in stock.
              Have fun.
              Support for Fender, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk

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              • #8
                Originally posted by Holmen View Post
                Thanks for the replies! appreciated!
                I think I will go with two of MAL215959101E3 from Mouser. These are 100uf and the correct dimension 25x35mm. No 82uf cap is in stock.
                Make sure the pin spacing is same and you are good.
                When diameter matches, the pin spacing is usually right, but it's worth checking.
                "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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