Garey Barrell <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Larry -
First step is to bridge C107, the Twist-Lok capacitor with a good 60+ uF @ 250V+ cap.
Next check R44 680 ohm 1/2W decoupling resistor for the 12BY7A driver stage plate supply.
Check bias supply in the AC-4, particularly the dual section Twist-Lok electrolytic filter cap.
73, Garey - K4OAH Atlanta
Larry Groom wrote:
I just aquired a TX4C that is having some quirky problems. When I put the transmitter into
the Tune mode after it's tuned, the power will jump to 100 watts and then drop down to 60 watts
after approx. 10 seconds. If I then tweak the gain control to a higher postion (ie move CW) the power
will return to 100 watts and stay there. I've taken the rig to a friends house who's very sharp on these
tube types. After poking around he discoved that the problem may be in the sidetone generator circuit.
He was able to see that the tune signal drops off as it enters the tube (can't remember the tube number)
and I was also told the my mic. audio was getting distorted as I was using it. (I imagine if I had increased gain
in may have come back) Also, when I tried to use the rig in CW mode the rig would go into transmit mode and
then drop out quick, just a beep and back to receive, irregardless of VOX setting.
Has anyone had this type of problem or any ideas?
Larry W0FLY
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