[Milsurplus] General Radio 1931-A Modulation Monitor

[jvendely at cfl.rr.com]

Brian,

The "AF33" number is indeed an Air Force contract number...

73,

John K9WT
---- Brian Harris via Milsurplus <milsurplus at mailman.qth.net> wrote: 
> I recently acquired my second General Radio 1931-A Modulation Monitor.  This one is a much later serial number (2688) than my first one (370).  On the front panel of this second is stenciled the following:
> 
> AF33-604-16827
> 7CAC-575975
> 
> First question:  Can anyone shed light on the nature of this stencil?  Might the AF mean Air Force?
> 
> Second question:  These units required a coil specific to a frequency range.  I have two coils, both of which cover .5-8 MHz in four ranges.  These are the most common coils as these units were most often used with AM Broadcast transmitters.  I would like to obtain one or two of the higher frequency coil, which I recall covers 8 - 30 MHz.  If there is an outside chance that you might have one or two of these available please let me know.  Of course I can fashion some myself but that is something I'd like to avoid.
> 
> Thank  you,
>  
> Brian Harris, WA5UEK 
> cell 214-763-5977 
> email cosmophone at yahoo.com
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