Re: Potter & Brumfield Sensitive Plate Circuit Relays
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Years ago the coil of a plate circuit relay was in series with the plate of a vacuum tube set up to conduct at the pull in current when the tube was biased on.? Using ohms law, 0.009 A X 2500 ohms = 22.5V to ¡°pull in¡± if you measured the voltage across the coil. ?Vacuum tubes were used just like transistors today to energize relays. ? -Chuck K1KW ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Nick Jones KC0YKO
Sent: Saturday, December 09, 2023 12:06 PM
To: [email protected]
Subject: [ham-amplifiers] Potter & Brumfield Sensitive Plate Circuit Relays ? All, I have an old homebrew RF deck that the T/R rely is a Potter & Brumfield LM11-2500. I can't find what the coil voltage is. In the 1954 P&B catalog the LM series is titled?Sensitive Plate Circuit Relays and only list coil resistance and pull MA ratings. What was the typical application for a Sensitive Plate Circuit Relay, and what voltage energized the coil? Not sure why I am struggling to understand this but do not recognize the Sensitive Plate Circuit Relay application. Thanks Nick
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