On May 31, 7:12*am, Art Sowers wrote:
I'm interested in getting several of these filters (for the 75A4):

500 Hz, anything between up to but not including 3.1 kHz.

Need sources, prices.

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Thanks.

FWIW, I have an F 455 J 31 in front of me that I'd be happy to part
with for any reasonable payment. As far as I know, it's in good
condition, removed from (if I'm not mistaken) a Collins 490T HF
avionics transceiver. I'd be happy to check it on an HP8753ES network
analyzer to insure it's OK, if I find info on pin connections and in/
out matching to the analyzer's 50+j0 ohms. I gather this is the one
you _don't_ need, but perhaps someone else does. (Looks like probably
pins 1&2, and 6&7, are the in/out...9 pin miniature tube base.)

Cheers,
Tom