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Author Topic: unknown part  (Read 1651 times)
WA4NIZ
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Posts: 3




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« on: October 17, 2012, 12:21:43 PM »

Hello,
I have some old "IF" looking cans of WW2 or Korean era.
They are marked T-208 and U.S.E. #507 MFP.
Any help with identity would be appreciated.
If you can give me an e-mail I will send you a
picture
Thank's,
WA4NIZ
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AC5UP
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Posts: 3864




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« Reply #1 on: October 17, 2012, 04:21:45 PM »

Given the age and lack of markings your best bet would be to sweep them for a peak at 455 KC's or another common IF frequency. As a general rule IF transformers have four leads (two in, two out) and detector transformers have five as the secondary winding is center tapped.

If you want to play a hunch, the letters " MFP " were often stamped on military gear that had been treated with a mold and fungus preventative coating. Generally had a pale yellow color and once you've seen it you'll always recognize it. If you have way too much spare time, CLICK HERE to visit the BAMA web site, military section, where you can surf radio field manuals that might show a T-208 in the IF strip.

The MFP doesn't mean it's military surplus, but that's about the only time I've seen those letters stamped on a radio part.....
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WA4NIZ
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Posts: 3




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« Reply #2 on: October 17, 2012, 04:36:31 PM »

I thank you AC5UP Sir, for your comments.
There is a schematic on the side.
Looks like a filter of some kind.
Lot's of capacitors and resistors
variable caps and inductors.
Just can't find the unit it fits.
They are brand new and I hate to
discard them.
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WA4NIZ
Member

Posts: 3




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« Reply #3 on: October 22, 2012, 03:54:36 AM »

I now have a viewable Video.
http://youtu.be/WCKqfAJUON0
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KD0REQ
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Posts: 931




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« Reply #4 on: October 22, 2012, 12:32:46 PM »

filter demodulator?  balanced demodulator?  it looks like two of whatever, probably uncoupled, with B+ across the top for two tube sections through chokes, in one can to make it easy for those lax civilians to crank out a dozen a day for the war machine.  whatever it is, I'll bet it sat between two tetrodes without much else connected to the sockets.

if you can resonate either filter section with a JFET oscillator and read the frequency on a counter, that would be a good clue.
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