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Anyone know of a source for NE D24 neon lamps used in Conn ST-11 Strobotuner?

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  • Anyone know of a source for NE D24 neon lamps used in Conn ST-11 Strobotuner?

    My Conn ST-11 Strobotuner burned out the last of its three neon strobe lamps and is sadly dark.

    I tried putting NE 2H lamps in, but they fried.

    Anyone know of a source for NE D24 neon lamps (as listed in the Conn repair manual)?

    Thanks!

    ... watchman

  • #2
    I know I still have some, but they are buried in my storage unit.

    I would contact Peterson, who bought out all the old Conn strobetuner stuff. I think they have passed it along since, but they would refer you to that person.
    Education is what you're left with after you have forgotten what you have learned.

    Comment


    • #3
      Originally posted by watchman View Post
      My Conn ST-11 Strobotuner burned out the last of its three neon strobe lamps and is sadly dark.

      I tried putting NE 2H lamps in, but they fried.

      Anyone know of a source for NE D24 neon lamps (as listed in the Conn repair manual)?

      Thanks!

      ... watchman
      Do you have a link to the repair manual? I cannot find that designation for a NE anywhere.
      NE-2H max 135 v 1.9mA
      This pdf has NE types at the end of pdf https://www.tiffe.de/roehren/neon.pdf
      nosaj
      Neon list at the end of this pdf https://www.tiffe.de/roehren/neon.pdf
      soldering stuff that's broken, breaking stuff that works, Yeah!

      Comment


      • #4
        Manual is here.

        https://www.mmdigest.com/Smythe/Conn...-11_Manual.pdf
        "Yeah, well, you know, that's just, like, your opinion, man."

        Comment


        • #5
          Originally posted by The Dude View Post
          Thanks the one I was looking at was missing the parts list. Seems to be a really obscure neon.
          nosaj
          soldering stuff that's broken, breaking stuff that works, Yeah!

          Comment


          • #6
            I couldn't find anything on that neon either. I did find that some are converting the ST-11 from neon to LED, but not much other than this.

            https://www.worthpoint.com/worthoped...e-led-21064463
            "Yeah, well, you know, that's just, like, your opinion, man."

            Comment


            • #7
              Originally posted by The Dude View Post
              I couldn't find anything on that neon either. I did find that some are converting the ST-11 from neon to LED, but not much other than this.

              https://www.worthpoint.com/worthoped...e-led-21064463
              Looks like those Neons get hit with 180vDc. Have to pull mine out and look at it.

              nosaj
              soldering stuff that's broken, breaking stuff that works, Yeah!

              Comment


              • #8
                I wonder if D24 is a misprint in the Parts List. On the schematic it looks like D2A. There is a D2A called "High Brightness" in this Glow-Lite catalog:

                https://music-electronics-forum.com/...1&d=1562210679

                The D2A is listed as 1/3 Watt with a 22K resistor, compared to an NE2 - 1/17 Watt with 150K
                Attached Files
                Last edited by dmeek; 07-04-2019, 04:34 AM.

                Comment


                • #9
                  I think you're right, dmeek. If you look at the schematic in my attachment above (and ignore the parts list), it does look like it says D2A.
                  "Yeah, well, you know, that's just, like, your opinion, man."

                  Comment


                  • #10
                    Now that we have specs, maybe you can find something. I think you could make the NE 2H work if you have more of them. You'd just have to install a larger load resistor (see chart post #8). They may or may not be bright enough.
                    "Yeah, well, you know, that's just, like, your opinion, man."

                    Comment


                    • #11
                      Originally posted by The Dude View Post
                      Now that we have specs, maybe you can find something. I think you could make the NE 2H work if you have more of them. You'd just have to install a larger load resistor (see chart post #8). They may or may not be bright enough.
                      Got confirmation here also.https://www.antiqueradios.com/forums...50757#p3050757nosaj
                      soldering stuff that's broken, breaking stuff that works, Yeah!

                      Comment


                      • #12
                        Originally posted by nosaj View Post
                        Got confirmation here also.
                        Interesting that the last entry suggests replacing the neons with super brite LED's. Hmmm, I've done that in Fender vibrato circuits, make my own "bug" with an orange, yellow or red LED and it works a charm. Haven't had one burn out yet, also no harm to the driving circuitry. Certainly worth an experiment even if you start with just one LED to see whether it works for you watchman.
                        This isn't the future I signed up for.

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                        • #13
                          I would modify it like this. The LED resistors could be anywhere from 220 ohms to 10 K depending on the LED specs and the brightness needed.

                          https://music-electronics-forum.com/...1&d=1562248713
                          Attached Files

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                          • #14
                            Peterson has entire bulb boards in stock for $24.

                            https://www.petersontuners.com/shop/...Vintage-Tuners

                            That reinforces my idea of contacting them for just the bulbs.
                            Education is what you're left with after you have forgotten what you have learned.

                            Comment


                            • #15
                              Originally posted by Enzo View Post
                              Peterson has entire bulb boards in stock for $24.

                              https://www.petersontuners.com/shop/...Vintage-Tuners

                              That reinforces my idea of contacting them for just the bulbs.
                              When you click on add to cart you get a message saying they are on backorder.

                              nosaj
                              soldering stuff that's broken, breaking stuff that works, Yeah!

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