[Milsurplus] Crystal Oscillator Unit ID Help

[James C Whartenby]

Yep, part of the ARC-21.  Used in subassembly O-180A / ARC-21, Radio
Frequency Oscillator.

Pin 1  Ground
Pin 2  Tube Heater (5840)
Pin 3  N.C.
Pin 4  Regulated 75 volts B+
Pin 5  Oscillator Assembly Heater (28 volts)
Pin 6  Test Point?  (5840 G1 bias monitor)
Pin 7  Oscillator output.

The usual "I promise to give them a good home, etc if you don't want
them." 8^) 
Jim

On Fri, 27 May 2005 11:55:03 -0700 Brad Hernlem <hernlem at gmail.com>
writes:
> I have some crystal oscillator unit items that I am trying to ID. 
> These 
> are two rectangular blocks with 7-pin mini plugs on the ends and an 
> 
> adjustment access hole in the side (to a ceramic trimmer). The units 
> are 
> dimensionally identical but one is marked:
> 
> Crystal Oscillator Unit
> A-8838300-1  500Kc
> Serial 0064:CRV
> 
> and the other
> 
> RCA DWG #8838300-1
> CKM DWG #B-355-11-A
> Serial No. 1600A
> 
> This second one is also marked 500 Kc. I believe that they are 
> essentially identical or were used in the same equipment.
> 
> The closest lead that I could find was a reference to an 
> RT-128A/ARC-21 
> made by RCA which may have used units like these. Any ideas or 
> info?
> 
> Thanks.
> 
> Brad
> KG6IOE
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