I finally got my 1966 TMC linear amplifier operating, but with a
modulated AM (MCW) input, my Wattmeter indicates an anemic 25 Watts
into a dummy load with a total PA plate current of 200mA (nominal
current reading according to the manual) for the two parallel
4CX250b's. The manual claims 200 Watts CW! Perhaps one or both tubes
are weak. Perhaps a resistor or capacitor has changed value. I just
don't know yet and may have to put it on the bench again.
If anyone knows of specific tube testers that will test ceramic
transmitter tubes, such as the 4CX250b or the 4CX350a, please share
them with this list. Many amplifiers and transmitters use these
tubes.
73 Hal KK6HY
P.S. I am still interested in TMC transmitter and amplifier original
prices to share with the group. So far, no one has responded. TMC
certainly seems to have kept their prices well hidden.
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