Jim -
The original relays in the T-4XC were somewhat failure prone. The coil
resistance is 12000 ohms. Easiest is to check the voltage at Pin 6 of
the 6EV7. You can check from the top the chassis by pulling the tube
out. You should read the +250V bus voltage at Pin 6. If you read 0
Volts, probably the relay coil is open, - OR - has fallen out of the
socket! There should be a wire bail holding the relay in place, but if
it's NOT in place the relay CAN fall out of the socket. IF you read
+260VDC or so on Pin 6, you'll need to do further troubleshooting.
If you get the replacement relay, P&B TYCO R10-E1-Y4-V2.5k, you'll need
to add a 1.5k ohm, 1W resistor in series with the coil.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
J G wrote:
Hello everyone,
I just got a C line to add to my B line. Love this stuff.
The problem:
The relay in the T-4XC will not switch to transmit.
Background:
The T-4XC was working when I got it, althought the switches needed to
be cleaned; I could tell by the meter bouncing around and by noise
made in the receiver when switching. I cleaned the switches and
checked the tubes while I was at it.
I put it back in line and things were fine for a while. Then, without
smoke, sparks, or any other fanfare, the relay stopped doing its job.
This was shortly after I plugged in a mic.
To eliminate any possible suspicion of the power supply, I tried the
AC-4 from the B line. No chnage (still not working).
If it makes any difference, the serial number is 21,000+ (forgot the
last 3 digits).
Question:
Would the relay just up and fail like that? I looked through the
archives and note that relays do need replacing at times. But, before
I order one (and thank for having the Mouser number there in a 1/2007
post), could the cause be elsewhere?
Thanks,
Jim
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