Heathkit used a Potter-Brumfield 3PDT Relay part number KA1521-1.
MORE THAN LIKELY...the resistance of the coil is 2,250 ohms as that was the
normal resistance that series of relays used on the 120 volt models. You
probably would be safe in that assumption but to be absolutely sure I would
suggest you refer to an old Radio/Electronics Master Catalog or perhaps an
Allied or similar catalog. That is an open frame style all purpose relay.
Potter & Brumfield is now Siemans Relays....
Based on this assumption, you can expect the coil current to be approximately
53.3 milliamperes ignoring any reactive effects of using AC current to energize
J. Leon Pringle, Jr. W5NA
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