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dynaco st70

  1. postman56

    Dynaco Pas 3 needs a new transformer Please help

    Hello I finally got around to seeing why my Dynaco Pas 3 Tube pre-amp was not turning on, and it appears it's the PA11 transformer that has no voltage coming off the two lines that are soldered to the SDS Labs board on the underside. I did see 12 volts at the fuse on the SDS card. Any...
    • postman56
    • Thread
    • dynacco dynaco st70 pas 3 transformer tube pre-amplifier
    • Replies: 2
    • Forum: Tube Audio
  2. B

    Dynaco ST70 audio research mod (D76 I think?)

    Anyone know what happened to this mod kit? I know you can buy VanAlstine kits for the Stereo 70 but I’ve been trying to find the Audio Research kit that I seem to remember for the ST70. Anyone know if someone sells this kit or licensed it? I’d just love to be able to mod this ST70 with the audio...
    • Bnoyes12
    • Thread
    • audioreseach dynaco st70
    • Replies: 6
    • Forum: DIY
  3. monreal

    Love the smell of old Vintage gear

    My memory of good sounding music started when I was a kid listening to KRLA on an old Farnsworth radio and phono combo. Fast forward to the 80's and I bought Phase linear gear from Pacific Stereo in Pasadena. Now I'm 66 and back to listening to old tube gear. The amp that I have now is a Dynaco...
  4. Y

    Connecting a Dynaco ST70 to a Marantz 2330B

    I am new to tube amps and I am wondering if I could connect a Dynaco ST70 amp to my marantz 2330b and utilize the pre amp and bypass the power amp portion of my receiver. I am thinking about buying an ST 70 but I need to know how to integrate it into my system. Thanks
  5. angelaudio

    Need help! Have a chance to buy Dynaco ST 70 all original but rectified tube looks blown

    Hello Akers I need your help.. I’m thinking of buying (at an estate sale) an all original dynaco st-70 in all original condition but I’m not sure if I should because the 5ar5 rectifier tube has a white smoke spot at the top. Does that mean it’s blown? Would this have caused other damage to the...
  6. cocovinyl176

    What tubes are you running with your Dynaco ST70

    Hi-Curious what some of you with (stock) ST70's are using for tubes. Are there specific Tubes any of you find deliver best sound quality? Does having the Original transformers without it upgraded somewhat limit options? Look forward your replies.
  7. F

    Thinking about buying this Dynaco ST70, is it worth it for a beginner?

    Hey guys, I've never been on this forum before but I was refered here and thought you might have some good info. I can get my hands on a ST70 for around $350, but only until tomorrow. I've been really interested in getting into speaker set ups and especially tube amps as a fledgling headphone...
    • Fredark
    • Thread
    • beginner buying diy dynaco dynaco st70 fix st70 tube tube amp used
    • Replies: 4
    • Forum: Dollars and Sense
  8. Cabdiver

    Dynaco ST70 rebuild with Triode boards

    Hello everyone. I'm a newbie with more enthusiasm than good sense who bought the Triode E input (Driver) and capacitor (power) boards in an attempt to bring an ST70 back to life. I've completed the boards and placed them in position on the chassis, but have gotten stuck on the final stages of...
  9. Dandy

    Bias supply for Dynaco ST70 replacement power transformer?

    As my mains voltage is 240V and the original Dynaco ST70 is under-rated, I would like to replace it with a massive PT that I have from an unknown 6L6 organ amplifier. It is the exact chassis size and has the right windings for B+, 5V and 6.3V but no winding for the 55V bias supply. There is a...
    • Dandy
    • Thread
    • dynaco st70 filament supply power transformer
    • Replies: 38
    • Forum: Tube Audio
  10. D

    Monarch STA 400X

    Hi all, I have a Monarch tube receiver I'm restoring for another AK member. I figured since I work on tubes mostly, I should be on AK after being at Videokarma for 5 years now. I proceeded to replace the electrolytic capacitors as SOP. An initial power-up was accompanied by fair sound from both...
    • dave-g63
    • Thread
    • 344 357 382 sherwood s2200 dynaco st70 fisher e49 s7600 scott 222 st120
    • Replies: 9
    • Forum: Tube Audio
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