Recent content by jazbo8

  1. jazbo8

    Dave's G's well spoken info.

    Fisher's First High Power Stereo Amplifier: The SA-300
  2. jazbo8

    Dave's G's well spoken info.

    Fisher's Original Bad Boy - the 50A Power Amplifier
  3. jazbo8

    Dave's G's well spoken info.

    Heath W4-AM Modifications
  4. jazbo8

    Glass Audio Back Issues??

    I’m looking for the following article: Rickard Berglund, “Quick, Simple Output Transformer Tests,” GA 1/95, pp. 24, 49. I would appreciate it if you can scan it and send me a copy. If you do not have a scanner, then it’s easiest to just take some pictures with your mobile phone. You may need to...
  5. jazbo8

    Dave's G's well spoken info.

    A New Beginning: Heath's W-3AM
  6. jazbo8

    Dave's G's well spoken info.

    Regilding the Gilded Lily: Heath's W-2M
  7. jazbo8

    Plush 4000G Schematic?

    4x EL34's, very interesting history about Plush here.
  8. jazbo8

    Can a 150w EL34 Class B Mixing amp sound good?

    Not much more than -36V, say -37~38V.
  9. jazbo8

    Can a 150w EL34 Class B Mixing amp sound good?

    As mentioned earlier, the B+ and screen voltages have to be lowered.
  10. jazbo8

    Can a 150w EL34 Class B Mixing amp sound good?

    With -36V bias, there is very little class A output at all, i.e., nearly all of the output is class B. You will have to judge it for yourself if the sound is acceptable or not, since you are using it for hi-fi not PA application.
  11. jazbo8

    Can a 150w EL34 Class B Mixing amp sound good?

    Didn't see the different winding voltages earlier, in this case, you CAN NOT wire the them in parallel. Instead you need to find other ways to lower the B+ voltage, such as MOSFET or resistive voltage dropper. The screen voltage will drop in proportion to the plate voltage once the voltage...
  12. jazbo8

    Let's talk about Primaluna amps

    See this.
  13. jazbo8

    Pilot AA-904 amp bias help

    You are correct. Tom, you should ignore my "instruction" above, I have deleted it to avoid confusion.
  14. jazbo8

    Pilot AA-904 amp bias help

    deleted
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