[ARC5] [Milsurplus] Frequency meter Crystal question -

[WA5CAB at cs.com]

Roy,

You're welcome.  The Signal Corps ones will be marked DC-9-aa where "aa" is 
a one or two-letter suffix mostly matching the model letter of the BC-221 
they were bought for.  The Navy ones will be marked Caa-40023y where "aa" is 
one or two letters and with the "C" is the Navy Contractor Code for whomever 
built the crystal.  It isn't particularly significant other than that it 
may be the code for a crystal manufacturer or the one for the LM manufacturer. 
 The suffix "y" became "B" at least as early as the LM-10.  But probably 
isn't significant to us either.  The metal cans vary from ones as tall as a 
6J5 to ones about 2/3 as tall but taller than a 6H6.  One of the 40023B's in 
my spares box is missing Pin 1 and from the construction of the base is 
likely mid to late 50's vintage.  Metal to glass hermetic seals and bright nickle 
plated can.

In a message dated 9/3/2009 11:36:08 PM Central Daylight Time, 
k1lky at earthlink.net writes: 
> On Sep 3, 2009, at 11:44 PM, WA5CAB at cs.com wrote:
> 
> >Hutch,
> >
> >Short answer is No. The manuals say no. TM 11-300 (the final  
> >edition) says
> >the Signal Corps DC-9's are wired to 3 and 7. Three different LM  
> >manuals
> >(two NAVAER and one NAVSHIPS) say that the Navy 40023B is wired to 2  
> >and 6. But
> >because these are mirror images I still didn't believe it. It  
> >wouldn't have
> >been the first time that an error got copied forward for years,  
> >decades or
> >centuries. So I went to the shop, fired up my TS-330A, and tested  
> >two of
> >each. Four different contractors. s'fact. Not the same. Who'd'a  
> >thunk it?
> 
> Robert,
> 
> Thanks for setting us straight on this.  I"m sure I have spare  
> crystals of that sort, but whether they are of the two different  
> types, I don't know.
> 
> Of course two jumpers on the crystal socket would at least let you try  
> the swap to see if it works.
> 
> Roy
> 
> Roy Morgan
> k1lky at earthlink.net
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480