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Title: interesting coil with brass form. Post by: Opcom 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?
Title: Re: interesting coil with brass form. Post by: KD1SH on January 19, 2023, 06:38:03 PM Maybe four separate roller contacts, each individually adjustable?
Title: Re: interesting coil with brass form. Post by: W7TFO 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 Title: Re: interesting coil with brass form. Post by: Opcom on January 24, 2023, 02:56:49 AM Maybe the rest of it is around. Stranger things have happened in estate cleanouts! AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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