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Resistor Markings Questions?

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  • Resistor Markings Questions?

    Hi All,

    Picked up a box of random small bits on the cheap today. Got a small collection of resistors similar to the one pictured. All have the same construction, same color, different values. They're a white ceramic core with what looks like a carbon-based resistive material around it. The resistance & tolerance are self-explanatory but I was wondering about:

    1. Power handling?
    2. All of them have that "1%2" followed by a sideways letter right after the 2. The letters are B, I, J, L, or M. I'm wondering what those final letters might mean?

    I tried goofling & even used my Goofle Lenz but haven't had any luck. Any ideas? Standard CTS pot for scale. Thanks!

    Jusrin
    "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
    "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
    "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

  • #2
    Judging by the logo this is a Rosenthal (Germany) resistor maybe from the 60s.
    Rosenthal made high quality resistors used e.g. by Rhode&Schwarz.
    - Own Opinions Only -

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    • #3
      Cool, thank you. Safe to say they're 1W? I'll see if I can dig up any more info.

      Jusrin
      "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
      "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
      "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

      Comment


      • #4
        Purely a guess, but I'm thinking the 1%2 means 1% tolerance and 2W. I can't think of anything else the "2" would mean.
        "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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        • #5
          Thanks Dude,

          After finding some on eBay that were "1% 0.5" I think you're right. I'll probably just treat them as 1W just cuz I think they're ancient. Maybe not. They seem to sell for a lot, for resistors I mean.

          Maybe I'll offload them.

          Jusrin
          "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
          "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
          "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

          Comment


          • #6
            I would tend to agree with The Dude, but I see on this page some specifically marked 1/2W, 1W, or 2W and they all still also have that '2' code on them:
            https://www.byan-roper.org/steve/ste...voltohmys.html
            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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