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Hammond Power Transformer - 100v Tap for Bias?

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  • Hammond Power Transformer - 100v Tap for Bias?

    Hi all,

    Iíve got the following Hammond power transformer id like to use with a Fender style power supply using the 50v bias circuit. Can I use the 100v purple wires and bring it down to 50v with a zener diode or voltage divider or something similar? Is that enough current?

    Any advice if this will work and how to connect it would be great!

    Thanks,
    -BW

    Click image for larger version

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  • #2
    Yes it looks like you'd be fine to use that winding for bias.

    That transformer appears to have dual 100/110/120v primaries, so be careful with how you wire them.

    I tried to look it up on Hammond's site, but couldn't find it as there is a digit or two missing from that torn corner. I don't recognise the 'H' prefix; possibly it is non-standard.
    Most of their transformers have wiring diagrams on their website. http://hammondmfg.com/index.htm

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    • #3
      You don't need to use a zener to regulate the winding voltage. You can just add a series resistor before the bias pot to increase the voltage division.
      "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

      "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

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      • #4
        ^^^^^^^ Yes that. A simple voltage divider providing, basically, a reference voltage is all you need. There is very little current drawn from the bias supply.
        Last edited by The Dude; 12-18-2019, 02:04 AM.
        "Yeah, well, you know, that's just, like, your opinion, man."

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        • #5
          Originally posted by The Dude View Post
          There is very little current drawn from the bias supply.
          ^^^^^^^^^^^^^^^^^^^

          This! Because there is insignificant current regulation isn't an issue. The voltage will be adequately constant with a simple divider.

          Thank you Dude.
          "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

          "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

          Comment

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