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Author Topic: interesting coil with brass form.  (Read 1532 times)
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Patrick J. / KD5OEI
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« on: January 19, 2023, 05:48:55 PM »
Found this unusual coil wound on a brass tubing form. It measures about 1100 Ohms, could this be part of an old precision variable resistor or lab-type unit? Why the 4 tracks?

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« Reply #1 on: January 19, 2023, 06:38:03 PM »
Maybe four separate roller contacts, each individually adjustable?
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« Reply #2 on: January 19, 2023, 10:04:04 PM »
That is a Western Electric type 74 resistor from a type 35 test set.  It originally had 4 sliders that were switched in & out by little telegraph keys to test various relay types.

The brass form makes it non-inductive.

73DG

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« Reply #3 on: January 24, 2023, 02:56:49 AM »
Maybe the rest of it is around. Stranger things have happened in estate cleanouts!
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