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Thread: Wurlitzer 4100b inductors / chokes

  1. #1
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    Wurlitzer 4100b inductors / chokes

    I recently picked up (not literally) a wurlitzer 4100b organ. 9 GE 12AX7 made it worth the money the rest is cream, including a Jensen C12R speaker and another alnico 12" of unknown origin, a whopping big PT, 28 RCA 12FQ8 (going to make valve casters), a pair of RCA 7868, numerous modular chassis and hundreds of brown caps (All Good brand)of similar form to those I have seen in SF Bassman (except they were blue). Oh happy days. Alas, no Leslie.

    There's also a bunch of inductors/chokes. According to the schematics posted elsewhere on this forum wurlitzer Model 4100bw, 4102bw and 4150bw organ they operate at 270v feeding into a 12ax7. Not having used chokes before, I don't know if these are go to be of any use as a power supply choke due to the current handling limitations they may have. Each one has a different size & inductance.

    Is anyone familiar with these chokes and are they of any use in an amp? Even a small SE EL84 & twin triode contraption? Anything else I could use them for apart from fishing weights?

    Many thanks
    Jeff

  2. #2
    rf7
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    They can be used in Wah pedals. https://www.youtube.com/watch?v=lL9ToDSFz0E

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    Senior Member trobbins's Avatar
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  4. #4
    Senior Member trobbins's Avatar
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    My 4100B had the following measurements:

    DCR Part # Inductance at dc current
    266 500407 4.1H @ 30mAdc: 2.3H @ 50mAdc; 0.9H @ 90mAdc;
    370 501123 2.9H @ 41mAdc; 1.4H @ 65mAdc; 1.1H @ 80mAdc; 1.0H @ 100mAdc;
    450 501124 1.7H @ 58mAdc; 1.2H @ 94mAdc
    466 501125
    940 501126
    227 500405
    227 500406
    320 500407
    400, 708 500408 1.4H @ 66mAdc; 0.9H @ 108mAdc
    427 500409 1.6H @ 60mAdc; 1.4H @ 97mAdc
    516 500410
    537 500411
    1016 8316202

    Ciao, Tim

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