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Hammond M slowly breaking down

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  • Hammond M slowly breaking down



    I have a 1969 Hammond M102 which I acquired about six years ago, not being hyper technical, just like playing it but I have lost all the Vibrato stops, (when the vibrato cancel is up there is very little sound) and the second percussion stop no longer works.</P>


    Feels expensive to me any one out who can advise.</P>


    Chris </P>

  • #2
    Re: Hammond M slowly breaking down



    Bad tube(s), dirty tube sockets, dirty switch contacts...</P>


    Sorry, not too familiar with the M100 but I'd suspect those first, as they're likely the cause, as well as cheap and easy to diagnose. </P>


    http://www.captain-foldback.com/Hamm...schematics.htm</P>


    Check there for schematics and diagrams for your organ. </P>
    <P mce_keep="true"></P>
    <P mce_keep="true"></P>

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    • #3
      Re: Hammond M slowly breaking down



      Replacing the tubes as a complete set is not difficult. Doing this will more than likely restore the vibrato and percussion functions. I can personally recommend Captain Bob's Electronic Emporium on ebaY for buying the set. He's the only outfit I've come across thatsells tubes as aset. Most retailers sell individual tubes. Look inside the back of the organ. You'll see two amplifier chassis at the bottom. The larger is the main amp, the smaller for reverb. The main amp chassis is referred to as an AO-29 and the reverb amp will probably an AO-44 if it's a 1969 model. Look under the dust on top of the reverb amp chassis to make sure- it should be stamped on in black. There were three different reverb amps used (AO-66 and AO-35 are the other two). The set of tubes will run about $150 depending on which type of reverb amp you have.</P>


      You'll also want to oil the tone generator if it hasn't already been done.</P>

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