[Drake] T-4XB Problem

[Larry Yates]

I am posting this for a friend of mine, Tom Webb, W4YOK.  If anyone has incurred this problem before and was able to solve it please let me know or you can email him at: sam9lives1 at verizon.net.  He has been struggling with this problem for a while now.

Thanks,
Larry Yates
WA4PMA




T-4XB PROBLEM

Turn transmitter on.  Turn Function switch to "Tune" and tune up normally.
Power output is 90 watts, normal.  Switch to X-CW and close the key.  Power
output is 20 watts.  After 20 minutes, power output is normal 100 watts.
Power comes up gradually, no matter whether key is open or closed during
interim. Plate current starts out low, rises to normal.

All tubes have been replaced with NOS tubes.  All tube voltages are correct
both before and after warmup.  All resistors in the final circuit have been
checked.  Problem occurs on all bands. Dummy load or outside antenna.