George -
If you set the T-4XC for 80M and tune the RF TUNE down around 6.5 on the
0-10 scale do you get any plate current in TUNE??
Since you say it controls the receiver ok in TRANSCEIVE, that means that
the BAND oscillator and PTO and PreMixer stages are working ok.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
K4GM- George wrote:
I turned on my trusty T-4XC a little while ago and it failed me! I
will try to swap out a tube or two but here are my observations in
case anyone might be able to point me to the fix.
1. The PTO appears to work fine because I can use it to operate the
R-4C in transceive mode using the xmtr PTO. There is no transmit power
2. The sidetone works well and the radio keys.
3. The RF Tune will peak as it should.
4. There is no dip when tuning the plate. In fact there is a peak
oddly enough.
5. Adjusting the Load control has no effect on plate current.
Relative output is unchanged when adjusting the plate control.
6. These measurements were made loaded into a 50 ohm dummy load.
Hope I am lucky and it is only a tube. However I am seldom lucky;
thus, I sent this email. Thanks to all who respond.
George K4GM
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