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Need JCM 800 2204 service advice

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  • Need JCM 800 2204 service advice

    Got my used JCM 800 2204 50W, MK2 head a few weeks back.
    I found and amp tech near me.
    I would like to have it gone over to check it out.
    I got it all original.
    What should I have him check for?
    Correct bias? What else?
    If the tubes need replacing what kind should I go for?
    I know one of the preamp tubes have been changed to a EH.
    Thanks
    Finn
    link to repairman http://www.fatubesound.com/

  • #2
    Re: Need JCM 800 2204 service advice

    Have him replace the filter caps if they look like the originals. Not sure about the tubes - are they original too?

    Pete

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    • #3
      Re: Need JCM 800 2204 service advice

      2 of the 3 preamp tubes have markings of (2A1 AJ7). The other says:Electro-Harmonix 12AX7EH Made in Russia 01 02
      No markings on the Power tubes.
      How many filter caps are there?

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      • #4
        Re: Need JCM 800 2204 service advice

        How much does it cost to change filter caps?

        (Im going to give my laney a tune up soon)

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        • #5
          Re: Need JCM 800 2204 service advice

          Depends on how many filter caps you have, how long it takes to replace them, and what your tech charges. [img]/images/graemlins/smile.gif[/img] Oh, and what brand he replaces them with... not so much for JJs, if you want something stupid expensive like some of the audiophile caps that angela.com sells, bend over.

          Pete

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          • #6
            Re: Need JCM 800 2204 service advice

            Anything else?
            Bias, Tubes if needed, Filter caps if needed?
            Any idea on the tubes I mentioned in above post?

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