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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


2 posters

    STEP-UP - PAS

    Pillo69
    Pillo69


    Posts : 176
    Join date : 2012-04-11
    Location : Granada (España)

    STEP-UP - PAS Empty STEP-UP - PAS

    Post by Pillo69 Mon Dec 22, 2014 8:22 pm

    I tried to place a Beyer Dynamic transformers PAS, to use capsules MC on my turntable.
    The result is bad, introduces much noise. This problem is PAS?.
    peterh
    peterh


    Posts : 1833
    Join date : 2012-12-25
    Location : gothenburg, sweden

    STEP-UP - PAS Empty Re: STEP-UP - PAS

    Post by peterh Tue Dec 23, 2014 3:53 am

    Du you mean hum ? In that case hum might be coming from the transformers themself, they will
    pick up any magnetic fields that is present in the house.

    Try to move them around, or put them inside an iron box ( old 2 inch water pipe tubing with endcaps
    of iron is a good material to shield MC transformers.)
    Pillo69
    Pillo69


    Posts : 176
    Join date : 2012-04-11
    Location : Granada (España)

    STEP-UP - PAS Empty Re: STEP-UP - PAS

    Post by Pillo69 Tue Dec 23, 2014 11:54 am

    These are isolated by a metal box bought for it.
    I still introduces a nasty buzz.
    peterh
    peterh


    Posts : 1833
    Join date : 2012-12-25
    Location : gothenburg, sweden

    STEP-UP - PAS Empty Re: STEP-UP - PAS

    Post by peterh Tue Dec 23, 2014 12:21 pm

    Pillo69 wrote:These are isolated by a metal box bought for it.
    I still introduces a nasty buzz.
    If they still hums with their inputs shorted there is a problem with them.
    If the hum stops when inputs shorted you might have a ground-loop problem between
    PAS and recordplayer
    Pillo69
    Pillo69


    Posts : 176
    Join date : 2012-04-11
    Location : Granada (España)

    STEP-UP - PAS Empty Re: STEP-UP - PAS

    Post by Pillo69 Tue Dec 23, 2014 1:35 pm

    Among the turntable and preamplifier there is good grounding.
    I'll check other options and comment.

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