|[AMRadio] ceramic tube tester|
manualman at juno.com
Thu Oct 9 20:22:37 EDT 2008
QRZ bio, and on your home page, you indicate your "favorite frequencies"
are 3870 KHz and 12.263 MHz (Collins Radio Group).
On Thu, 9 Oct 2008 16:30:26 -0700 "H.L." <hl at sfsu.edu> writes:
> 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
> 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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