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Hughes & Kettner Cream Machine - Noisy

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  • Hughes & Kettner Cream Machine - Noisy

    Hi,

    I have this old H&K Cream Machine which is a bit noisy and hummy:
    http://hughesandkettnermicroamps.wee...m-machine.html

    The schematics are here:

    Click image for larger version

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    I did replace the valves not long ago so they are quite new. But still it is quite noisy.

    Any advices where to start with this, new caps maybe?

    Thanks.

  • #2
    Originally posted by josegrad View Post
    I did replace the valves not long ago so they are quite new. But still it is quite noisy.
    In principle, each HiGain (pre)amp generates more or less some noise.

    Question
    Is the replaced tube quite (as) new or new.
    Replace V1 (CM1) with new low noise tube 12AX7 (7025)

    Is there noise when VR1 (Gain) set to min. (far left)
    Who does not know and knows that he does not know - teach him Confucius)
    Who knows and does not know that he knows - wake him Confucius)

    Comment


    • #3
      Thanks Vintagekiki.

      Actually I did buy new tubes. With low gain it is not noisy, but setting gain and master above 7 makes it quite noisy.

      Comment

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