[Drake] TR-4Cw RIT restoration (I)

[Dave Edwards]

Jose....
Have enjoyed reading about your other restorations, including using your web
site to upgrade relays in my old FT102.
I also have a TR4CW/RIT, and it may be my favorite rig....certainly is the
best tube transceiver I have ever used!!
Regards...Dave
----- Original Message -----
From: "Jose V. Gavila (EB5AGV/EC5AAU)" <eb5agv@ctv.es>
To: <drake@mailman.qth.net>
Sent: Saturday, April 13, 2002 4:29 PM
Subject: [Drake] TR-4Cw RIT restoration (I)


> Hello!
>
> Well, I have spent several hours cleaning the TR-4 set (TR-4Cw RIT S/N
> 45445, RV-4C, MS-4, AC-4). Now they shine like new :-)!. It is incredible
> how smoke deposits over panel, knobs, chassis, tubes and so on. Covers
were
> specially dirty; as a sample, TR-4 side lettering was brown...
>
> I had been told TR-4 troubles were a large attenuation (50dB) in all bands
> and a large (about 280kHz) tuning frequency error. First trouble should be
> located in a common circuit, so I started to look in the schematics from
> the antenna connector. First thing, after the relay, was a '#12 fuse lamp'
> and, yes, you guessed it, was broken. I put a temporary wire jumper on it
> and checked the set. It received in all bands and seemed to perform well
> (no large attenuation at all). So, although I will later align the set,
> first trouble was gone :-)!
>
> Then I looked for frequency accuracy, connecting my trusty HP8640B at
> 21.150 and -73dBm. And, yes, the set was really out of frequency, as it
> received the signal at about 21.400 dial indication. And the frequency
> tuning was not completely stable; I got an slightly warbling sound instead
> of a constant tone.
>
> As I also had the RV-4C external VFO, I connected it to the TR-4 and it
was
> dead accurate and, best of all, there was no warbling... So it seems the
> trouble is located in the TR-4 PTO assembly; I will check it when I have
> some time.
>
> So things sound promissing!. I plan to get the PTO out of the set and
> connect it by means of an extension cable to the set, so I can make
> measures with it working. I will look first for dead / value changed
> components and then, if there is no evident trouble, I will check it with
> the set powered. More to come!
>
> BTW, if somebody has an spare #12 fuse lamp, I will be interested in
> getting one. I need also the two non-standard crystals (42.5 and 43.6
MHz),
> as they were missing. Thanks!
>
> Regards,
>
> JOSE
> ----------------------------------------------------------------------
>   73 EB5AGV / EC5AAU - JOSE V. GAVILA
>      La Canyada - Valencia (SPAIN)
>
>   Vintage Radio: http://jvgavila.com
>   Vintage Test Equipment: http://jvgavila.com/testeq.htm
>   European Boatanchors List: http://groups.yahoo.com/group/euro_ba_swap
>
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