[R-390] IF Amplifier

[Glenn Little WB4UIV]

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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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"