Help with a Matchless Chieftain please!

Discussion in 'Amps and Cabs' started by Aidanspaghetti, Jan 22, 2012.

  1. Aidanspaghetti

    Aidanspaghetti Supporting Member

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    Hi all,
    Ive a 97 Chieftain that I've just rehoused into a cobra 1x12 combo shell (thanks rob sharer!). I have no reverb tank in the 1x12 shell and have the amp rehoused with no problems.
    When im playing the amp now (less than 45 minutes since rehouse) there's a high pitched whistle (very faint though). If the reverb knob is turned up its gets screechy and messy.
    Ive stopped playing it since discovering this so my question is ultimately am I doing any serious harm to my amp, powering it up without a reverb tray attached?
    Does there need to be a circuit for the reverb to work quietly?
    I must order a new one as I dont want to rip out the lovely padded cover etc on my 2x12 - any ideas where to get a replacement?

    Any help with this would be greatly appreciated as always!
    Regards,
    Aidan
     
  2. Randy

    Randy Member

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    I'm guessing it's just the effect of the vibrations from the combo cab shaking slightly microphonic preamp tubes. I would try a tube swap first.
     
  3. Aidanspaghetti

    Aidanspaghetti Supporting Member

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    Thanks Randy but its whistling while lieing idle so =(
    Think its definitely linked to the rev circuit!
    Thanks for the response though - will check tubes fully seated etc...
     
  4. Randy

    Randy Member

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    If a tube has gone microphonic it will still whistle at idle, in my experience. It does seem odd that turning up the reverb knob when the tank is removed would have any effect though...
     
  5. Aidanspaghetti

    Aidanspaghetti Supporting Member

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    Yup, it is weird.
    Hope its just that =(
     
  6. Gearopenia

    Gearopenia Member

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    If it ONLY happens in connection to the reverb pot being on its probable the tank itself. The wires that connect to the spring get alot of wear and tear. Maybe the move into the new cab finished the ware off. Cheapest fix is call matchless and replace the tank.
    This is assuming you checked the simple tube issue.
     

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