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  • Superior TV-11 Tube Tester

    I was just given a Superior TV-11 tube tester. It needs a little work that will not be to bad.
    The main problem is the meter adjustment is not working correctly. I opened it up and found that a couple of winding's on the the adjuster are burnt. SCHEMATIC AND PHOTOS ATTACHED.

    Would like to know what could be used to replace it?

    The schematic shows it as a 250 Ohm but the one installed reads 350 Ohm.

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    It's all about the bass. Lock in the groove and stay out of everyone else's way.

  • #2
    I would call that 'line adjust' rather than meter adjust. I doubt it gets used near either end so a 250 or 350 should both work there, the wattage rating would be the important spec.
    Is it working aside from those bad spots? And they are right in the area of most use? If so, if it was mine I would swap the wires to the ends around which should move the bad spots to an unused section.
    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

    Comment


    • #3
      Agree^^^

      Value is not critical. Wattage is though. The 0.27A rating on the part with the 350 ohms leads me to think it is a 25 watt part. It LOOKS like a 25w part.
      Education is what you're left with after you have forgotten what you have learned.

      Comment


      • #4
        G1

        It is used to set the meter in the center of it's range. Appears to be in the area of most use.
        When turning it to set the meter the needle starts to move up but before it is centered the pot reaches the broken spot. When it's turned past the break, the meter jumps up past the center and I can hear a growl.

        Tried the tester without centering the meter with the pot set just before the break. Everything appears to work OK. I haven't checked any of the resistors in the unit. I bet both of the caps in it are bad.
        Last edited by J Luth; 11-28-2019, 05:38 AM.
        It's all about the bass. Lock in the groove and stay out of everyone else's way.

        Comment


        • #5
          Wondering if this would work.

          https://www.newark.com/ohmite/rhs350...ive_Components
          It's all about the bass. Lock in the groove and stay out of everyone else's way.

          Comment


          • #6
            Should work, yes.
            Education is what you're left with after you have forgotten what you have learned.

            Comment


            • #7
              The tester has a 2-wire mains connection with no earth and no isolation, though.

              Comment


              • #8
                Thanks Enzo
                It's all about the bass. Lock in the groove and stay out of everyone else's way.

                Comment


                • #9
                  Mick
                  You are correct
                  It's all about the bass. Lock in the groove and stay out of everyone else's way.

                  Comment


                  • #10
                    One side of the line goes straight to that pot. That's why I call it line adjust. It affects the meter by adjusting the voltage going to the whole unit.
                    I still say you should swap the end wires around and see if it is still a problem. I think it will work fine that way.
                    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

                    Comment


                    • #11
                      I wouldn't use the thing without an isolating transformer.
                      - Own Opinions Only -

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