Sunn 200s bias question

Discussion in 'Amps and Cabs [BG]' started by draygriff, Apr 1, 2018.

  1. I have an old Sunn 200S that I would like to resurrect. It needs new tubes. Does the amp need biasing or is it a fixed bias amp?
  2. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Needs to be biased, and it's not a DIY project on these amps. There is no convenient way to measure the plate current, a bias socket fixture is needed (or the amp needs to be modified to include this in the cathode circuit).
  3. Thanks for the reply. Looks like I need to find a good amp tech.
  4. Stumbo

    Stumbo Guest

    Feb 11, 2008
  5. Stumbo likes this.
  6. chadds


    Mar 18, 2000
    What!? I'm biased toward them. Isn't that enough? :)
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