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Resistor Markings Questions?

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  • #1

    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
    1 Photo
    "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 -
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  • #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."


            ​
            • Likes 2

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