Tim -
What is the serial number of the unit you have? There were eight
versions of the TR-4, and 4 versions of the TR-4C. There were several
tube type changes over the run.
All 12 schematics are on my CD. If you work on TR-4/Cs, I think you
would find it very helpful.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
Bolbach, Timothy wrote:
I just purchased a TR-4 at a hamfest. I have worked on several before ,
but this one is different. It has a noise blanker (an add-on kit)
installed and the schematic is closer to a TR-4c than a plain TR-4. The
noise blanker is switched by an add-on switch behind the Tune control.
The only difference from a TR-4c that I can see is that the crystal
calibrator is a 6BA6 ( it's a 6BZ6 in a TR-4c), and it does not have the
noise blanker switch on the lower right corner of the front panel. It
has two 8 pole filters, not a soup can. Is there a schematic and manual
for this particular radio, or can I use the TR-4c manual to work on it?
Is this a late-model TR-4 before the c came out? Thanks KD8CN
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
