Hi Paul:
Regarding the fan. I have used fans on my A and B series and am
installing in the TR's now. A standard 80mm square fan will fit
perfectly on the back of the final cage. While you will get advice
suggesting both directions of air, I think the best is to have it
drawing air OUT of the cage. This way, it draws air from the entire
interior of the rig. It is amazing how much cooler they run this way.
I have used 12V fans but switched over to 24V but running on 12V so they
are quieter. Search thru Jameco or MCM or Mouser or Digikey etc to find
the quietest, highest flow 80mm fan. On the TR4 and Tx4A,B, the holes
in the cage exactly lined up with mounting holes in the fans so no holes
were ever drilled. I U can use some small nylon thread inserts to
mount. I have also used foam mounting tape strips and this works just
fine and is very quiet.
For power, use the 12Vac filament lines--I use a bridge diode rectifier
assy and a 100mFd 25-35V cap. and snake the wires out without drilling
any new holes.
I'm sure others will chime in on this as well..this has been my experience.
Keep em glowin
Curt
KU8L
Paul Strickland wrote:
I acquired this TR-4C from my father a decade ago, W9LKZ (SK). I've
rebuild the power supply with great success a few years ago. Now I
have a problem with the xmtr keying circuit. After allowing the rig
to warm up for half an hour or so when I key the mic and then release
it the transmitter section remains in the transmit mode. Not a whole
lot of fun... I also found this 4 section cap # C145. Where can I
find a replacement for this device. I love these old glow in the dark
rigs, also keeps the shack warm in the winter. I have also seen/heard
of a mod to put a fan over the final amp cage. What voltage is being
used to power the fan and how big of a fan?
Thanks for all the other good info I've gleaned from this site
Paul Strickland
WB9SUG
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