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im-12

  1. J

    DYNA ST-70 Harmonic Distortion Testing using all 1960's Heathkit Tube Technology

    In this video I will demonstrate harmonic distortion testing of my Dynaco ST 70 amplifier using all Heathkit tube gear from the 50's and 60's. This demonstration will show the THD produced from this amplifier at 2KHZ using three different power inputs. The equipment used includes: Heathkit...
    • JRUBIN
    • Thread
    • dyna dynaco heathkit ig-72 ig72 im-12 im12 st-70 st70
    • Replies: 15
    • Forum: Tube Audio
  2. s-petersen

    Heathkit IM-48(IM12,HD-1) IM-58 (AA-1 IM-22 ) troubles

    Hi Guys and Gals, I have a Heathkit AA-1 audio analyzer and a IM-58 harmonic distortion meter. They both have issues.They didn't work when I bought them. I am working on the IM-58 currently. So far I have found several bad solder joints,and a few incorrect resistors. I have been able to...
    • s-petersen
    • Thread
    • aa-1 hd-1 heathkit im-12 im-22 im-48 im-58
    • Replies: 6
    • Forum: DIY
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