[TMC] Wanted: Schematic on a modified FFR-2 (R-5007/FRR-502)

[WA5CAB at cs.com]

I was recently contacted by a collector who has what the nameplate says is an 
R-5007/FRR-502.  I have the NAVSHIPS AN/FRR-49(V) manual, a copy of that 
manual, and the original TMC FFR manual that the NAVSHIPS is based on.  But the 
tube lineups do not match the list that the collector sent me.  And although my 
NAVSHIPS includes changes up through 1969 and some of the changes involve tube 
type changes, none of the revised lists match, either.

Specifically, the following tubes are different:

Tube New   Manual
V103 6BE6 6AL5
V104 6FM8 6T8
V107 7199  6AG5
V108 NONE 5Y3GT 

I didn't take the time to see what the new V104 and 107 are but I'd say it's 
pretty likely that the 6AL5 2nd Detector/AVC tube was converted to a product 
detector.  I told the owner that my first guess was that it was ham hacked but 
he replied that it was too neatly done and that the tube numbers are all 
stamped on the chassis.  But the nameplate wasn't changed.  So I'm mystified.

If any of this jogs anyone's memory cells and/or if anyone has any 
information that would apply to the modified main frame please let me know.

Robert Downs - Houston
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