Hi Guys,
About a month ago I was in a CW QSO using my C-line twins. While
transmitting I was getting a little long winded, nothing outrageous, my
transmission lasted
maybe 1.5 minutes at the most when a quite visible puff of smoke arose
from the T-4XC and the panel lights went out. Every thing was dead. I
have been fairly
busy lately and only now have I had a chance to try and figure out what
happened. I opened up the T-4XC and did a visual check top and bottom
and could find
no discolored or burnt components. I checked the AC-4 and the main fuse
(5 amp slo blo) was blown. I replaced the fuse and checked the power
supply voltages
everything was fine. I put the transmitter on a dummy load and it loads
up fine. The power out seems a little light. It seems like I need an
awful lot of plate current (nearly 400ma)
to get over 100 watts on 40 meters. I didn't keep it at that plate
current for very long. I did notice that the neutralization is off a
bit. I guess I should do a voltage check and a complete
alignment as it hasn't been done in a while. But I am not sure where to
start looking for the origin of the smoke. Any ideas as to where I
should start looking?
Thanks in advance,
Bob K6GGO
P.S. the 15 ohm cathode resistors are fine
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