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    VTA PAS 2 - Z Mod - (DIY Newbie Question)

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    Dingojazz

    Posts : 39
    Join date : 2010-09-03

    VTA PAS 2 - Z Mod - (DIY Newbie Question)

    Post by Dingojazz on Wed Jan 12, 2011 2:12 pm

    I am adding the Z upgrade to my PAS phono section, which already has the VTA Power Supply upgrade, as well as the the VTA "dyna-clone" phono and line stage boards. I have assembled the Z-mod phono board per the instruction, my question has to do with making the Filament Voltage and B+ connections to the Z-Mod board. Currently it appears the Filament voltage connections go to connections 14 & 15 on the "old" phono board. Assuming these are the - and + filament wires, how do I determine polarity?

    Also, it appears (?) that the B+ connect on PC 6 are at 4 and 11... if so, again how to determine polarity there?

    Any help appreciated.

    K.

    tubes4hifi
    Admin

    Posts : 1286
    Join date : 2008-11-30

    Re: VTA PAS 2 - Z Mod - (DIY Newbie Question)

    Post by tubes4hifi on Thu Jan 13, 2011 2:33 pm

    on the phono board, eyelets 4 and 11 are both ground, eyelet 16 is B+
    If you don't have the original schematic for the PAS3 you can download the entire manual here for free:
    http://www.tubes4hifi.com/Dynaco%20PAS-3%20manual.pdf

    tubes4hifi
    Admin

    Posts : 1286
    Join date : 2008-11-30

    Re: VTA PAS 2 - Z Mod - (DIY Newbie Question)

    Post by tubes4hifi on Thu Jan 13, 2011 2:58 pm

    the Zmod boards show polarity because they are also used in the Z preamp (which replaces the older SP8) with a regulated power supply.
    I'll try to post those board diagrams here, if they don't work they are also posted on my website at:

    www.tubes4hifi.com/ZP.htm






    tubes4hifi
    Admin

    Posts : 1286
    Join date : 2008-11-30

    Re: VTA PAS 2 - Z Mod - (DIY Newbie Question)

    Post by tubes4hifi on Fri Jan 14, 2011 3:15 pm

    I just posted an update to the power supply layout showing where the filament outputs go.
    The final answer to any question is ALWAYs found in reading the schematic !!

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    Re: VTA PAS 2 - Z Mod - (DIY Newbie Question)

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