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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


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    PAS Filament current

    Scot_B
    Scot_B


    Posts : 8
    Join date : 2013-06-26
    Age : 66
    Location : North Dallas, Texas

    PAS Filament current   Empty PAS Filament current

    Post by Scot_B Sat Sep 28, 2013 7:05 pm

    I see that I can save on current consumed by switching up to the LED mod vs the standard bulb. Seems like a good move rather than replacing the old burned out bulb.  This has me thinking,  I don’t use the phono or tape inputs that belong to the PC-6 card, could I get away with pulling the 12AX7’s on it without modifying the PAS and achieve even better filament current savings and not adversely affect the line card performance ?
    Bob Latino
    Bob Latino
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    Posts : 3263
    Join date : 2008-11-26
    Location : Massachusetts

    PAS Filament current   Empty Re: PAS Filament current

    Post by Bob Latino Sat Sep 28, 2013 7:22 pm

    You could pull those 12AX7 tubes on the phono board - BUT - then the other two line stage 12AX7's would be working at somewhat higher voltages which *could* shorten their life. What I might do is put a couple of cheapie Chinese 12AX7's on the phono board and save the better (Telefunken original ?) 12AX7's that are on the phono board now.

    Bob
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    PAS Filament current   Empty Re: PAS Filament current

    Post by Guest Sun Sep 29, 2013 4:09 pm

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    Last edited by PeterCapo on Wed Dec 02, 2020 4:15 pm; edited 2 times in total
    Scot_B
    Scot_B


    Posts : 8
    Join date : 2013-06-26
    Age : 66
    Location : North Dallas, Texas

    PAS Filament current   Empty Re: PAS Filament current

    Post by Scot_B Sun Sep 29, 2013 4:24 pm

    Seemed like a good idea... I think I'll leave the tubes alone, and just replace the burned out bulb with the LED kit...

    Thanks for the responses

    Scot

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