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

[D Platt]

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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