This is for reference:
I am working on restoring a stripped TR-4C. One thing wrong with it is the
filter cap needs replacing (the 4 section can electrolytic in my case. I
think earlier ones had a 3 section can electrolytic). My can electrolytic
is definately bad. That resistor you are talking about in my radio is
cracked and broken in two and it is a 47 ohm resistor. It is called R-163
in a TR-4C. I think it got ruined when the can electrolytic went bad.
Maybe your resistor is getting hot due to a bad can electrolytic. When I
got my radio the relay was also missing and the 27 ohm resistor in series
with the relay coil was also burned up and broken in two. (My radio uses a
different relay then yours). I don't know if this also happened when the
can capacitor went bad.
Now here is some info for maybe your radio. Looking at an earlier TR-4
manual, not a TR-3 manual, I see the resistor is marked R-111 and is a
3.3k resistor. I'm talking about the resistor you are having trouble with
going between the two boards. Again, maybe your electrolytic is bad and
causing your replacement 3.3k resistor to get hot.
I bought the CD service information disc for the TR-4 and TR-4C radios from
K4OAH. It saves me a lot of time finding the parts on the radio. The
schematics and color shots of all the sections of the radio are of very high
resolution. Also, I purchased a fresh replacement can electrolytic from
Hayseed Hamfest Co. www.hayseedhamfest.com It is "drop in", fresh,
newly made, great construction and the voltage ratings of each section are
slightly better then those of the original cap.
Hope this helps.
Lee, w0vt
Houston, TX
My radio came
----- Original Message -----
From: "John King" <k5...@yahoo.com>
To: <drakelist@zerobeat.net>
Sent: Thursday, December 25, 2008 10:30 AM
Subject: [Drakelist] REALLY DIFFERENT TR3
Thanks to some very nice guys on this list, who have been helpful to me, I
have determined that I have a WEIRD Drake TR 3.
My TR 3 is Serial # 6564 and since there were various versions, I now know
that the two boards between tube sockets V 18 and V 19 and the audio
transformer are wired differently than those two TR3s below #10,000 owned
by my friends Doyle and Larry. When I hook up the 3.3K resistor to the
terminals used in their TR 3s I get hot resistors and SMOKE!!!!
When I put the 3.3k resistor between the top left terminal on the
"forward" of the two boards and the top right terminal of the "next board
back" from the front the receiver works albeit it is NOT very "hot" and
the crystal calibrator reads only about S5 on the S meter. NO SMOKE when
resistor is mounted between the two boards in that manner.
Does anyone have a TR 3 which has the 3.3k resistor mounted between the
two boards at the top terminals of each???
MY schematic diagram is almost unreadable and the part designations and
values are almost unreadable. In addition, my manual and schematic did not
come with the TR 3 I have.
I love Drakes, but sometimes I think each was wired as if it was a
prototype wired and assembled by retarded CHIMPS.
Anyone have any suggestions for trouble shooting this WEIRD conglomeration
without the specific schematic and manual for this run of TR3s. Speaking
of "runs" this thing gives me the runs!!!!!!
Merry Christmas and Happy New Year to ALL!!! 73, John, K5PGW
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