[Milsurplus] [ARC5] GF/RU Information

[ac2eu at yahoo.com]

 Hi Dave,I found a manual here:aafradio.org/docs/Early_RU&GF_Navy-radio-gear.html
Looks like it had push -pull 837's

    On Monday, September 7, 2026 at 12:53:48 PM EDT, arc5--- via ARC5 <arc5 at mailman.qth.net> wrote:  
 
  I'm trying to help a gentleman with GF/RU information.I thought had a GF-2, but can't find it.  I do have aGF-1, but the information needed is part of the GF-2.
Many of us are familiar with the Army copying  SCR-274N,but many may not know that the Navy first pilfered the GF setfrom the 1932 Army SCR-AB-183.  The two diagrams are essentially mirror images.  These early sets used 4-pin Triodes.
The Navy had been using the 1932 RU receiver forRange/DF/Liaison for some time.By adding a transmitter copied from the Army's early SCR-A*-183, they had a puny, though workingCommand Set.  Only 1.5 Watts out, but it was a start.They began tinkering with it right away.They added the transmitter andordered the first "GF/RU" set as a "GF,"not separating  this as a transmitter nomenclature until GF-1.  The order contract for the "GF" setof RX/TX was let in November of 1932.  
If you have a GF-2 or a manual for it,  Nomenclature plate info oncontract dates and equipment CBY- numbers plus a view of the tube sockets would be very helpful.  Our big question of the moment is the tube compliment, specifically  the deployment of the 837.We know for sure the triodes were in the original GF andthe GF-1.  We know for sure that the 837s were in the GF-3.The question is: Which transmitter version was firstto deploy the 837?  What year was the contract let which"modernized" the GF transmitter to use 837?
TNX OM ES GL DE Dave AB5S______________________________________________________________
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