[R-390] OT: Misc. Mil Parts Question
Glenn Little WB4UIV
[email protected]
Sun, 23 Feb 2003 14:24:34 +0000
The Polyphase LPF (Low Pass Filter) is most probably an audio filter based
on the frequency (14.5 KC) and the impedance (47 K).
The last item may have been an early optical coupler. There were things
like these in early solid state TVs. The six pins could be the optical
detector and the socket where a light bulb was to be installed.
73
Glenn
WB4UIV
At 12:47 PM 2/23/03 -0600, Michael Melland wrote:
>A guy at work that was in the Navy back in the 60's dug some NOS parts out
>of his garage and gave them to me. I got them cleaned up today and was
>wondering if anyone recognizes them or has any idea if they'd still be
>useful ?
>
>1. Gray plug in "tube like" round cans, abt 2.5 " long, marked Engineer
>Electronics, T-643, Flip-Flop.... are these early flip-flop IC's ?
>
>2. Several NOS Polyphase Instrument Co, LPF 14.5 KC 47K, marked also 6540
>
>3. About 2.75 " long black paper tubes with 6-pins on one end and a socket
>with spring loaded contact on the other. Marked with a "pulse trace" with
>3C and a part number 3004325. Look almost like a bulb socket of some type.
>
>He told me these were comm. items as he worked as an ET in a RTTY room....
>
>Mike
>--
>Michael Melland, W9WIS
>Winneconne, Wisconsin USA EN54pc
>qrp-l #1656 - qrparci # 9875 - iparc #252
>ars #1075 - http://webpages.charter.net/w9wis/
>
>
>_______________________________________________
>R-390 mailing list
>[email protected]
>http://mailman.qth.net/mailman/listinfo/r-390