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T200-1 vibrato siren whining

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  • T200-1 vibrato siren whining

    Hi there,

    I have an issue with a T200-1 (or TR200).
    This one has the drum vibrato scanner, belt driven.
    It is turning normally, I would say.

    Playing without vibrato is ok.

    When no drawbar is out, switching on vibrato is ok - of course you cannot here it as no drawbar is pulled out.

    When any drawbar is pulled, also just to 1 or 2, and I switch on vibrato (no key depressed, but pressing makes no difference),
    the whole organ starts to whine like a siren and only stops if I switch vibrato off.

    I is a rising tone, very loud. (just as an example - sounds like a capacitor loadig up thru the speaker.)

    Any ideas? Is that known?
    I tried to search the forum and the net, but I seem to use the wrong key words....

    Help appreciated.
    REgards, Mark
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