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The Dynaco Tube Audio Forum

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


    PAS 2 Hum identification and isolation help

    bubbasweet
    bubbasweet
    bubbasweet


    Posts : 95
    Join date : 2016-03-14
    • Post n°1

    PAS 2 Hum identification and isolation help Empty PAS 2 Hum identification and isolation help

    Post by bubbasweet Thu Oct 05, 2023 12:59 pm

    Someone really needs to make a standard youtube video about isolating and troubleshooting hum on the PAS. Seem to be many many post on right channel  bass control causing hum.

    Here is a vid and a photo of the chassis top and bottom for lead dress. Anyone know what kind of hum this is and help on how to isolate this? THX


    Hum Video

    Chassi1

    Chassi2
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    bubbasweet
    bubbasweet
    bubbasweet


    Posts : 95
    Join date : 2016-03-14
    • Post n°2

    PAS 2 Hum identification and isolation help Empty Re: PAS 2 Hum identification and isolation help

    Post by bubbasweet Thu Oct 05, 2023 9:39 pm

    Pulled off both B+ leads off from Can and fired up and Still hear the hum. Then tried with rectifier disconnected from Can cap also and still hums on one side. Has to be the Filament circuit IE likely the Selenium no?
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