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fixed bias

  1. primosounds

    Be careful of doobtube videos.

    I say"doob", as in short for dubious. In this video about rebuilding a Fisher 500b I was checking out this video since i am working on one of these and was interested to see what kind of mods he was proposing. And then this came up as a "mod" at around the 13 minute mark, the poster talks about...
  2. primosounds

    Converting a PP EL34 cathode biased amp to fixed bias, what changes?

    I have a PP el34 amp with Dynaco A420 output transformers. These are UL OPTs as it is installed in the amp. B+ currently is 420vdc, with 4 individually biased output tubes. I have installed, but not implemented, a negative bias supply which can supply -88vdc. The front end consists of a 6sn7...
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