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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


    My custom St-70

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    tubeguy8888


    Posts : 10
    Join date : 2022-09-22

    My custom St-70 Empty My custom St-70

    Post by tubeguy8888 Tue Sep 27, 2022 12:56 am

    I Recently had my st70 rebuilt.
    1. Eliminated quad cap can, Triode/Pentode switch
    2. Replaced GZ34 with 2 parallel JAN Sylvania 5V4G
    3. The 5V4G supply up to 320 mA
    4. Tube lag is gone
    5. Used custom made Oak chassis
    6. Connect 4 & 8 ohm outputs
    7. No more problems 2 overworked GZ34
    8. No humm, noise, static. Super quie
    9 Power tubes are quad of Telefunken EL34
    10. Bias is slightly  cool. (35 mA) to help vintage t

    Telefunken last longer
    11. Sylvania v6189w , gold pin 3 mica in V1. V3 phasr inverters, input V2 Sylvania 5814. Gold pin 3 mica

    Terrific sound speakers : Cerwin Vegas E710. 200 watts per channel, 98 dbbsensitivity, 8 ohm


    Last edited by tubeguy8888 on Tue Sep 27, 2022 1:17 am; edited 1 time in total (Reason for editing : Add pics)

      Current date/time is Mon Dec 09, 2024 10:21 pm