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  • #1

    Power transformer ID

    Hey folks, anyone have reference info for Stancor transformers? I am trying to find the specs on a PT marked C300042-G1-B and 138752.
    I'm assuming 138 is the Stancor mfg #, but nothing shows up on Google for the rest of the digits.
    Thanks
    Tags: None
  • #2
    Pics? Wire colors? Have you ohmed out the windings - what's connected to what? Unless someone has a catalog, you'll probably have to do some "dirty work..." Voltages can be calculated; just err on conservative for current. Good luck!

    Justin
    "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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    • #3
      You are going to have to test the transformer to see what secondary voltages you have.(as noted by Justin, the current rating will be a toss up).

      I have found three different Stancor catalogs.
      All of the power transformers start with the letter P.
      So that number ( C300042-G1-B ) may be an in house number.
      The #138752 does indicate a Stancor part, indicated by 138.
      752 is a date code. July of 1952.

      Links:
      http://www.clarisonus.com/Archives/Trans/Stancor61.pdf
      http://www.tubebooks.org/file_downlo...ancor_1959.pdf
      http://www.technicalaudio.com/pdf/El...960_REM_24.pdf
      http://www.tubebooks.org/file_downlo...ancor_1952.pdf

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      • #4
        I am trying to find the current rating before I purchase the transformer.. all the leads are marked, dude says it's from a Fender amp.
        Apparently it's 850vct, does that ring a bell for any huge/oddball Fender amps?

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        • #5
          Hey Jazz,

          Every other reference to EIA codes I've read said first digit is year, 2nd & 3rd are week of that year... is it a 52nd week of either 57 or 67? I may be wrong...

          Justin

          Edit - if he says all the leads are marked, can you get them for us?

          Hmmmm... oddball big Fenders... 300PS? 400PS? Rumble Bass?
          "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
            Thanks for the correction JT.
            Gotta get that second cup a java.

            Some manufacturers will use a 4 digit system where the first two are the year & the last two are the week.

            Personally, I find the three digit system, where the first single digit is used for the year, friggin' stupid, confusing & downright useless.

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            • #7
              "Huge" is not a measurement.

              850V CT means 425V RMS, +600VDC , practically unusable.

              "Came from a Fender amp"..... which one?
              The most important or useful piece of data is hidden or unknown.

              Run away.

              Edit: although I also prefer the 4 digit code, the 3 digit one is fine for the Manufacturer, for production and storage control, also for reordering.
              They know whay year it means, for sure

              The system was not meant for anal obsessive "collectors" who after testing an amp, look at the codes to decide whether they will love or hate it.

              I love the standard Enzo answer when somebody asks him : "I have xyz amp, do you know what year is it from?" to which the typical reply is: "I dunno nor care, I just repair them "
              Juan Manuel Fahey

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              • #8
                What's wrong with 600VDC? Practically unusable for what?

                Agreed about doubtfully from a Fender, though...checked the schems, all list B+ of 650+ with the tubes in. Also agreed on run away. But enjoying the solving the mystery.

                Justin
                "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

                • #9
                  OK guys thanks for the info and opinions.
                  Certainly doesn't match up with any Fender I know of, or the ones Justin mentioned.

                  FWIW I'm considering this for a bench variable power supply/tube matcher type thing. I'm not too concerned with the voltages, just want to ensure the iron is up to the task in case I grow a wild hair and try and match a quad of KT88's or something.

                  Comment

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