[MRCA] Help request for restoring T-195 and looking for R-392

[Joe Foley]

Aw, ya' got yer numbers confused!

I think you meant to say the T-195 instead of the
T-368, the T-3 has no dynamotor.

Joe



--- D Platt <jeepp at adelphia.net> wrote:

> Tom, 
> Baran's Surplus (in PA) had, or did have the GRC-19
> racks.  They are 
> really heavy, however, and may be costly to ship. 
> Baran's and/or maybe 
> Fair Radio still have dogbones.  I ordered the
> connectors to make a 
> dogbone from Fair and, instead, they sent a dogbone.
>  You may also luck 
> out.  Wm. Perry Co. also has all the GRC-19
> connectors, save the remote 
> control plug.  Regarding meters, the multi-meter can
> be subbed with a 
> standard 1ma movement.  The meter can be calibrated
> by applying 28v and 
> setting the meter for center-scale, which is the cal
> point for 28v on 
> that meter switch setting.  Grid drive and PA
> current become relative 
> but, again, center scale is "nominal".  The db meter
> is another story, 
> slightly.  I use a 100ua movement with a bridge
> rectifier ahead of it 
> and a trimpot for getting the readings on-scale.  On
> one of my T-368s, a 
> friend provided a suitable a.c. db meter.  One other
> point I'd like to 
> mention is the actual model T-368 you have.  The
> T-368( ) runs off two 
> internal dynamotors.  The starting current of this
> configuration is 
> about 90 amps.  This will tax many power supplies
> and supplies like the 
> PP-4763 will trip the breaker, every time.  Also the
> primary power 
> contactor in the T-368 may become problematic
> without regular 
> burnishing.  If you can locate either or both of the
> solid-state 
> replacement power supplies, it will help a lot...
> especially the HV 
> p.s.  The inrush current will be very low.  If both
> are replaced, as in 
> the T-195B, the current drops down to about 36 Amps
> at both start and 
> run conditions.  Also... any very important... the
> T-195 needs to have a 
> minimum of 28.5* volts and prefers 29 volts to
> properly run the servo 
> system. (look closely at the nomenclature tag) 
> Check your power 
> supplies and see what you have? At any rate, it
> sounds like your unit 
> probably came from the depot in PA (primary depot
> for the GRC-19).  No 
> meters and no knobs is typical.  I would recommend
> that you clean all 
> relays, switches, and the RF output swinging
> contact.  inasmuch as many 
> of these units were stored in un-kind conditions and
> have some internal 
> corrosion, albeit not too bad in most cases.  The
> only knob that is a 
> problem is the very long test key knob.  I'm still
> looking for a couple 
> of them!  Again, Fair Radio may be a good source of
> generic "GRC" 
> knobs.  Finally, good R-392's are where you find
> them.  They are not 
> that rare and I'm sure you'll locate one.  I have a
> "spare" but its one 
> of only a very few Collins-mfg Navy/Marine corps
> receivers and I don't 
> care to part with, at the moment.  Forgot to
> mention, Fair Radio has the 
> book sets.    Feel free to contact if I can help
> with any more info.  
> I'm not a GRC-19 guru (unlike W3PWW!) but
> been-there, done-that, not a 
> few times......    Good luck with your worthy
> project!   de Jeep/K3HVG
> 
> *  The R-392 does not want/need more than 28v, max. 
> I installed a 
> series diode on both the filament and B+ input pins
> (D and A) , inside 
> the R-392 to tame the input voltage a bit.
> 
> TChirhart wrote:
> 
> >Hoping the members can help me out.  Last week I
> found a T-195 that is
> >missing the meters and all knobs.  While asking
> around I was informed
> >that most of the knobs are standard GRC radio types
> so hope someone
> >among the group can help.  I would imagine the
> meters will be nothing
> >short of a small miracle to find but I was informed
> that one of the
> >meters is the same as the R-390 series. The other
> meter, the one that
> >has a scale from "0" to "500" for the P
> >A Cathode, PA Grid and Battery may be the tough one
> to find. Perhaps
> >another meter can be modified to fill this purpose
> and perhaps a
> >replacement meter face is available similar to the
> KWM-2's etc.  Along
> >with these requests I'm also looking for the tray
> mount for the GRC-19
> >(T-195/R-392) a manual, the dogbone and the DC
> power cable.  Thanks in
> >advance.
> >73
> >Tom K4NCG
> >
> >
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> >MRCA at mailman.qth.net
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> >
> >
> >  
> >
> 
> 
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