[TMC] AN/FRR-49 aka FFR-502 variant

[Albert Santangelo]

I have a couple of the same FRR-502 variants of the FRR-49. There doesn't seem to
be a schematic available for the 502 in order to document all the differences.

Some additional changes I've noted in comparing these are: the addition of a 7pin
plug in relay in the avc circuit, along with the addition of a ferrite 455kc IF
filter to replace the first IF transformer in the 502. Seems to be about a 5kc
bandwidth filter. The product detector is different as well.

I don't believe there are any direct crosses for the 7199. Some tubes are close
but sockets would need to be rewired to use them. The 5842 also has a cross to a
417A. Its a single triode in a 9 pin package.

Al Santangelo  VE3 AJM

WA5CAB at cs.com wrote:

> Roy, et al,
>
> Does anyone know what 7199 and 5842 cross to (like 6AK5W/5654 or 6BA6W/5749,
> etc.)?  I don't think that I ever heard of them.  Field Change 4-AN/FRR-49(V)
> and Field Change 3-AN/FRR-502 made some tube type changes but they were 6AK5
> and 6AG5 to 6BA6.  Reported in T-5 to NAVSHIPS 92786A dated 17 July 1964.
> Those are the only tube type changes that anything that I have shows.
>
> In a message dated 6/7/2004 6:48:13 PM Central Daylight Time,
> telegrapher at att.net writes:
> > >
> > >TMC-ers,
> > >
> > >(Pardon if this has appeared here - I've been on no-mail for a while):
> > >
> > >I've received a query from Greg White, VE3FAX, "G.White"
> > >asking about a variant of the FFR-49 receiver:
> > >
> > >>hi, i am looking for info on the frr49.
> > >>There was a manual I downloaded for it, but it doeasnt show the correct
> > >>tube layout for my version, which used the 7199 tube and and a 5842 ,
> > >>These tubes were then repalced be different ones.
> > >>
> > >>Do you have any info on the 49 unit and the tube switch that took place on
> >
> > >>some production models?
> > >
>
> 73
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> <wa5cab at cs.com> (Primary email)
> <wa5cab at houston.rr.com> (Backup email)
> ______________________________________________________________
> TMC mailing list
> Home: http://mailman.qth.net/mailman/listinfo/tmc
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:TMC at mailman.qth.net