[Drake] T-4XB Problem

[GGLL]

	I would start checking the carrier crystal oscillator;  when in Tune, 
C1 (10 pF) is shortcircuited, but inserted in series with the crystal in 
CW mode, to raise frequency 1 KHz.

Perhaps C1 is bad, do you hear a steady beat tone (at another receiver) 
when either cold or after 20' operation?.

Regards
Guillermo - LU5WE.

El 11/12/13 22:58, Larry Yates escribió:
> 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.
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