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Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


    SP14 question

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    ikir

    Posts : 3
    Join date : 2020-03-22

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    Post by ikir on Sun Mar 22, 2020 2:32 pm

    Hi, I am new to this forum, tube gear and to hi-fi stereo in general. I've recently completed SP14 preamp (I got assembled PCB, so only minimal soldering required).
    When I power the preamp and start listening, sometimes I can hear a little hum or pops in speaker - this effect seems to completely go away after probably 5 minutes or so. Is this normal or I have done something wrong?

    Thank you,
    Kirill
    DavidR
    DavidR

    Posts : 47
    Join date : 2017-08-10
    Location : MetroWest, MA

    SP14 question Empty Re: SP14 question

    Post by DavidR on Sun Mar 22, 2020 7:17 pm

    Have you tried changing tubes?
    Are the tubes NOS?
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    ikir

    Posts : 3
    Join date : 2020-03-22

    SP14 question Empty Re: SP14 question

    Post by ikir on Sun Mar 22, 2020 7:19 pm

    DavidR wrote:Have you tried changing tubes?
    Are the tubes NOS?

    Tubes are NOS, I didn't try to change tubes, but I did try to use second output.

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