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tea kettle whistling in the tubes

exhaustedexhausted Posts: 6,638
edited November 2003 in Musicians and Gearheads
ok, you can hear a faint whistling sporatically in the amp. not loud at all. can't hear it when playing. it would fuck up recordings though.

which tubes are dying? or is this even the problem?
Post edited by Unknown User on

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    mccreadyisgodmccreadyisgod Bumfuq, MT Posts: 6,395
    Sounds like microphony in the preamp tubes...
    ...and if you don't like it, you can suck on an egg.
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    exhaustedexhausted Posts: 6,638
    that's what i kinda suspected. thanks.
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    mccreadyisgodmccreadyisgod Bumfuq, MT Posts: 6,395
    According to the Marshall info pages:
    "Where pre-amp valves are concerned, the most common fault is microphony : a high pitched whistling noise which is apparent all the time, whether anything is plugged into the amp or not. This is often caused by the first pre-amp valve in the chain and can sometimes be cured by simply swapping pre-amp valves around."
    http://www.marshallamps.com/images/extra/lifeofvalves/valvelife.html

    Might give it a try, anyways.
    ...and if you don't like it, you can suck on an egg.
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    exhaustedexhausted Posts: 6,638
    woohoo. found some new sovtek 12AX7s i bought for my old blues deluxe and never used.
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    mccreadyisgodmccreadyisgod Bumfuq, MT Posts: 6,395
    So did it fix the problem?
    ...and if you don't like it, you can suck on an egg.
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    exhaustedexhausted Posts: 6,638
    yeah, your swap idea fixed it. thanks.

    and i was just happy to find some tubes. i found a pair of 6L6s as well. brand new. for an amp i no longer have. off to ebay they went.
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    mccreadyisgodmccreadyisgod Bumfuq, MT Posts: 6,395
    That's cool... at least the amp is okay, no need for costly repairs (a la me and my Vibro Champ).
    ...and if you don't like it, you can suck on an egg.
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