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open circuit induced hummmm

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  • #16
    Ok, wrong schematic, no measurements, no scope pics. What do you expect?
    - Own Opinions Only -

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    • #17
      Right schematics, just incomplete at first.

      I did get one more measurement, there's about 8-10v p-p of ripple on the main B+,so a bad diode or excessive output tube consumption seems unlikely.

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      • #18
        Without NFB presence won't work.
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        • #19
          Originally posted by Helmholtz View Post
          Without NFB presence won't work.
          Well there is a simple test that any user can perform.
          Originally posted by Enzo
          I have a sign in my shop that says, "Never think up reasons not to check something."


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          • #20
            I'm down with Dude's notion. What if there's an open or badly off value screen grid resistor and bias was set to an appropriate current for two tubes?
            "Take two placebos, works twice as well." Enzo

            "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

            "If you're not interested in opinions and the experience of others, why even start a thread?
            You can't just expect consent." Helmholtz

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