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    new style pas3 i/o board question

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    dmag

    Posts : 30
    Join date : 2010-10-05
    Location : North Shore,Ma.

    new style pas3 i/o board question

    Post by dmag on Fri Jan 30, 2015 2:22 pm

    I am planning to install my new style RCA jack I-O PCB that has been sitting in my drawer for much too long.
    I have two questions.
    1. Mine ,unlike the one pictured has solid trace connecting all grounds except the phono input. .
    This would tie the input and out grounds together, which i assume would be incorrect.
    2.the original has a 10 ohm resistor tied between the tape in and tape out. The grounds being tied by trace would negate the resistor.

    The PAS has zmod boards for pc5 and pc6.Triode capboard and tone controls removed. Additionally has updated selector and volume /balance pots. Blend is intact.
    How should I proceed?
    thanks

    tubes4hifi
    Admin

    Posts : 1261
    Join date : 2008-11-30

    Re: new style pas3 i/o board question

    Post by tubes4hifi on Sat Jan 31, 2015 12:41 pm

    all grounds in a preamp should be tied to the same common ground (star ground), except for the phono input grounds,
    which should go directly to the phono board itself, which is then grounded.
    I've never used the 10 ohm resistors, they aren't necessary.
    Roy www.tubes4hifi.com/PAS3-CAT.htm


    Last edited by tubes4hifi on Sat Jan 31, 2015 6:42 pm; edited 2 times in total

    dmag

    Posts : 30
    Join date : 2010-10-05
    Location : North Shore,Ma.

    Re: new style pas3 i/o board question

    Post by dmag on Sat Jan 31, 2015 2:08 pm

    Very good. Thank you, Bob

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