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Complete set of valves for an M100

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  • Complete set of valves for an M100

    Could anyone advise where I could get a list of all the valves an M100 should have? I'd be very grateful. If anyone could even advise where best to get them that would be even better!

  • #2
    Valves rather than tubes... UK based? Probably Watford valves are your simplest single source. But you'll have to tell them what you want. And that will depend on the age of the M100.
    https://www.watfordvalves.com/index.asp
    See Captain Foldback's schematics page here and identify which of the variants age wise you have:
    http://www.captain-foldback.com/

    Or if you don't like Watford valves, An Ebay search is your friend, there are no unusual valves in Hammonds.

    TWG has a nice image of the AO-29 valve set here, and ship world wide:
    https://ssl.tonewheelgeneral.com/bui..._no=AO29-TUBES

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    • #3
      Oh great! Thank you. Yes UK based, Scotland actually (see facebook.com/organizedrod). It's because if I try and stop the vibrato I only get percussion chinks instead of any proper tone. My mate at Vintage Hammond Hire Scotland suggested checking the valves first so I thought it a good opportunity just to get replacements for them all just to be sure. I also have a C3 which had a similar problem but he fixed it for me. Anyway, thanks again

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      • #4
        Originally posted by Rod The Mod View Post
        Oh great! Thank you. Yes UK based, Scotland actually (see facebook.com/organizedrod). It's because if I try and stop the vibrato I only get percussion chinks instead of any proper tone. My mate at Vintage Hammond Hire Scotland suggested checking the valves first so I thought it a good opportunity just to get replacements for them all just to be sure. I also have a C3 which had a similar problem but he fixed it for me. Anyway, thanks again
        A better way is to swap the two 6AU6 tubes first, and see if the problem reverses (and vibrato "on" goes silent).

        I'd be surprised if the tube was at fault. It's usually a resistor gone bad.
        Current organs: AV, M-3, A-100
        Current Leslies: 22H, 122, 770

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        • #5
          Agreed, try this first. Replacing all the valves without testing is possibly rather wasteful. They are pretty reliable overall and if they haven't had a huge amount of use you may be discarding perfectly good valves while an O/C resistor is the problem. If you have the AO-44 reverb amp, the ECL86s are no longer produced and getting scarce and expensive, so don't junk them unless they test bad.

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