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

[H.L.]

Hi Robert:
I have two FRRs. One has a name plate simply identified as "FRR- " (no number) and the other "R-5007A/FRR-502." The former has the same tubes as listed in the manual. The R-5007A has the 6BE6, 6FM8, and 7199 tubes that you cited and the tube numbers are printed on the chassis. Unfortunately, I do not have the manual for this variation. It also has a bandpass filter that replaces one of the IF transformers. It is specified as "FL-820, Part # 30190:01:5:518, Manufactured by Ferritronics Ltd., Richmond Hill, Ontario."
Hope this helps.
73 Hal, KK6HY




>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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