Author Topic: 302 phone -- What does this do?  (Read 584 times)

Offline novarlynx

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302 phone -- What does this do?
« on: July 24, 2016, 01:23:40 AM »
A friend who knows I collect phones gave me a metal housing WE 302 from 1938.

Inside it, I found this rectangle shaped thing next to the dial. It says "WESTERN ELECTRIC MADE IN USA" and "10-38" but other than that I cant tell what it does. There's some wires coming out of it, two going to the dial and looks like one going to the hook switch.

I have two plastic 302s from 1948 and 1947 and neither of them contain the mystery component.

Thanks for the help!
The digital PSTN is so boring now. I wish I could have experienced what it was like to use the Bell System with all its analog wonders.

Well, at least we have museums. Right?

Offline Kenton K

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Re: 302 phone -- What does this do?
« Reply #1 on: July 24, 2016, 01:46:58 AM »
This is a dial filter that stops the dial pulses from interfering with I believe AM radio signals. This is was an optional. If you look in most wiring diagrams, you can see the filter wired in drawn dashed wires. I think the 500 set had the filter built into the network, but it's been a while since I've looked at a schematic so could be wrong.


Online TelePlay

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Re: 302 phone -- What does this do?
« Reply #2 on: July 24, 2016, 08:55:54 AM »
It's a 61A filter

and it's been discussed in several other places on the forum over the years. This topic is a good discussion, with pictures, of the filter

including the definitive explanation plus wiring diagram provided by unbeldi

            John . . .