[R-390] IF Amplifier

[Les Locklear]

Glenn and group,

That was a spare parts contract awarded to Communications Systems Corp. in 1966  for audio modules. They also manufactured Veedor Root Counters order/contract no. SM-C-249195. And, audio cw filters. They were located in Morton Grove, Illinois. 

Glenn, look closer at the contract number. I have it listed as FR-11-022-C-C-26418(B) That example was in a 1967 EAC s/n 4743.

There are several other manufacturers that manufactured spare parts modules under separate order/contract numbers. Stewart Warner, Clavier Corp., and American Transformer Coil located in Richmond Hill, Long Island, NY.

Les Locklear

----- Original Message -----
From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
To: <r-390 at mailman.qth.net>
Sent: 9/15/2019 7:46:47 PM
Subject: [R-390] IF Amplifier
________________________________________________________________________________

I have an IF Amplifier that was never completed.
It is part number SM-C-343621.
I have heard that there are two versions of the IF amplifier and suspect 
that this is the first and was pulled from the assembly line when the 
second or later version was approved.
There is another number that I do not recognize on the IF Amp.
FR-11-C22-C-4-26418(E), possibly a contract number.
If there were two versions if the IF Amplifier, what were the changes?
I would like to build this amp as if it were a kit to ensure all 
resistors are in tolerance and the capacitors do not leak.

Any ideas?

73
Glenn
WB4UIV

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