[R-390] IF Amplifier

[Tom Bridgers]

Yes, I agree with Barry. Except what Glenn has is the equivalent of the 
sparkplug, and he wants to build a car. 

Can it be done? Yes, but how many years do you have to make it happen? The parts missing are so rare and so  unobtainium, that it will be a very frustrating project.

Good luck!
Tom KE4RHH 


Sent from my iPhone

> On Sep 16, 2019, at 9:29 AM, Glenn Little WB4UIV <glennmaillist at bellsouth.net> wrote:
> 
> Les and group
> 
> I have two pieces.
> Both are contract number FR-11-022-C-4-26418(E).
> Part number SM-C-343621.
> No manufacturer name is on module.
> These are serial 0294 and 0323.
> 
> I can provide pictures if desired.
> One was bought many years ago and the other at the 2019 Shelby hamfest.
> 
> 73
> Glenn
> WB4UIV
> 
> 
>> On 9/16/2019 8:41 AM, Les Locklear wrote:
>> 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
>> 
> 
> -- 
> -----------------------------------------------------------------------
> 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"
> 
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