04-08-2026, 06:45 PM
I've run into these three resistors I can't figure out. None of them seem to match any charts I've looked at so far.
470k ohm???
470k ohm???
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1930s resistor codes
04-08-2026, 06:45 PM
I've run into these three resistors I can't figure out. None of them seem to match any charts I've looked at so far.
470k ohm???
04-08-2026, 08:03 PM
While I'm pretty new, I think the chart I found on this forum suggests:
number 1 (yellow base, violet tip, orange stripe) should equate to 47K ohms number 2 (yellow base, violet tip, yellow stripe - or no stripe = body color) should be, as you said, 470K ohms As for number 3 I'm not sure how that one should be read. What model is this? Did you find what it should be according to the schematic? Best wishes, Roy
04-08-2026, 10:12 PM
If it's a resistor it might be 100k. The center stripe is black.
04-08-2026, 11:36 PM
I think that's right. This is a Fairbanks-Morse 5A which I just found the schematic on. I was actually doing ok without it until I ran into some caps with totally faded markings. Really simple design, easy to work on.Someone had replaced one of the 8mfd caps on the field coil with a 16mfd cap. ugh...
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