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Vibrolux 5F11 - Selenium Rectifier

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  • Vibrolux 5F11 - Selenium Rectifier

    I am in the process of building a 5F11 Vibroluxe and am wondering about the Selenium Rectifier listed on the circuit. All of the amps I have built are cathode biased, so I have no experience in this area.

    Should I simply replace it with just a 1N4007 or does it make more sense to set it up to be variable? If so, can you point me to a schematic which would help out - and also, what should it be biased to?

    Thanks,

    Greg

  • #2
    Originally posted by greg View Post
    I am in the process of building a 5F11 Vibroluxe and am wondering about the Selenium Rectifier listed on the circuit. All of the amps I have built are cathode biased, so I have no experience in this area.

    Should I simply replace it with just a 1N4007 or does it make more sense to set it up to be variable? If so, can you point me to a schematic which would help out - and also, what should it be biased to?

    Thanks,

    Greg
    Yes, just use a Si 1N4007 and tweak the resistors in the bias supply, to compensate for the better diode, to get proper bias voltage.
    Bruce

    Mission Amps
    Denver, CO. 80022
    www.missionamps.com
    303-955-2412

    Comment


    • #3
      Any selenium rectifier you can find will be 50 years old or more, they are leaky, and if one ever burns up on you, it creates a stink you will remember the rest of your life. A sort of burning rotten cabbage smell.

      Please, use a 1N4007.
      Education is what you're left with after you have forgotten what you have learned.

      Comment


      • #4
        Does this amp need to be fixed bias?

        Thanks,
        Greg

        Comment


        • #5
          Well, no. But for best results (the vibrato circuit is modulating the power tube's bias voltage to get the "power tube" vibrato)... so, fixed bias works the best.
          Both the 5E11 and the 5F11 are fixed bias.
          Bruce

          Mission Amps
          Denver, CO. 80022
          www.missionamps.com
          303-955-2412

          Comment


          • #6
            Not just a bad smell, but toxic.

            Comment

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