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Thread: audible pop

  1. #1
    Senior Member pyonc's Avatar
    Join Date
    Dec 2009

    audible pop

    I currently listen to JBL Olympus with McIntosh MC240 as the power and McIntosh C22 as the tube preamp.
    Now, all good except for the audible pop through the speakers when I turn off the power amp, with C22 on, first after listening.
    The pop is very brief & sharp (NOT from woofers, etc).
    I tried different preamps like JBL SG520 and McIntosh C24, but I don't any pop, fortunately.
    So, clearly there must be something wrong with C22, though all its functions work alright.
    On googling on this, I see something like a DC current leak or bad capacitors, etc of the preamp.
    Before I take it to the tech shop, I'd like to ask for your opinion or solution, as usual.
    Thanks much for your feedback in advance.

  2. #2
    Senior Member
    Join Date
    Feb 2019

    hard to discern as the MC-240 schematics that is available from doesn't show any mains switch at all?!?

    Do you have a voltage meter that allows you to measure possible leakage voltages at the C-22's output?

    What happens if you turn the MC-240's volume controls fully ccw?

    Best regards!

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