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    Dynaco PAS-3 volume notch

    ViperZ
    ViperZ

    Posts : 100
    Join date : 2010-03-26

    Dynaco PAS-3 volume notch  Empty Dynaco PAS-3 volume notch

    Post by ViperZ on Sun Mar 15, 2020 11:54 pm

    I have read several threads about volume notch at around 12:30-1 o'clock on volume dial of PAS-3. I hate it on mine - there is a severe jump in volume at 12:30. My original volume control was uneven, so I replaced it with 4-pin Alps 250Kx2 volume pot, so it still had Loudness - it is super even now. Then I disconnected loudness switch today, as per Curcio instructions, and reconnected 4th pins to bottom/ground pins through resistors. I still have this notch...

    So is the only way to get rid of it is to replace my 4-pin Alps with 3-pin pot? Thank you.
    peterh
    peterh

    Posts : 1280
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Dynaco PAS-3 volume notch  Empty Re: Dynaco PAS-3 volume notch

    Post by peterh on Mon Mar 16, 2020 3:14 am

    ViperZ wrote:I have read several threads about volume notch at around 12:30-1 o'clock on volume dial of PAS-3. I hate it on mine - there is a severe jump in volume at 12:30. My original volume control was uneven, so I replaced it with 4-pin Alps 250Kx2 volume pot, so it still had Loudness - it is super even now. Then I disconnected loudness switch today, as per Curcio instructions, and reconnected 4th pins to bottom/ground pins through resistors. I still have this notch...

    So is the only way to get rid of it is to replace my 4-pin Alps with 3-pin pot? Thank you.
    Why not just disconnect the loudness taps on the pot ??

    Avoiding the "advice's" from Curcio might be wise ...
    PeterCapo
    PeterCapo

    Posts : 755
    Join date : 2008-12-05

    Dynaco PAS-3 volume notch  Empty Re: Dynaco PAS-3 volume notch

    Post by PeterCapo on Mon Mar 16, 2020 6:28 am

    +1
    ViperZ
    ViperZ

    Posts : 100
    Join date : 2010-03-26

    Dynaco PAS-3 volume notch  Empty Re: Dynaco PAS-3 volume notch

    Post by ViperZ on Thu Mar 19, 2020 3:43 pm

    Thank you both. I lifted those 4.7K resistors essentially leaving Loudness taps floating, and the volume control works perfectly now.

    Now onto figuring out phono wiring in this PAS-3, since it starts humming at like 10 o'clock on the volume.

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