>// Where is the getter in a 3-500Z?
>Where is the getter in an 8877?
>Can gettering take place while a tube is cold?
I recommend contacting the manufacturer for these questions. If you
prefer to avoid Eimac, then talk to Claude Peterson at Econco in
Woodland, CA. (800) 532 6626. He was involved with some of the glass
Eimac tubes at Salt Lake City before they sold that operation. Maybe
the 3CX1500A7/8877 as well....
Let us all know what you find out.
>// What if an amplifier was generating energy above the HF passband of
>the tank, where the energy produced could not be dissipated in the load?
This would force voltage or current somewhere. Probably where it
isn't wanted. I would think it more likely to happen in that case
either at a harmonic resonance in a line circuit or at a resonance
due to the inherent inductance and capacitance of components in LC
tank which stack up (resonate I mean) at some other frequency. Its
been covered in QST and ARRL and Orr and Terman for many years.
>// However, such gas seems to vanish just before the suspect tube is
>affixed to a high-pot tester.
Hi Potting IS a cold process, no thermally driven electrons involved.
Try hi potting a tube with bias and with the heater lit, and you may
see otherwise. We hi pot cold often just for incoming test (for
warranty purposes), then let the RF voltage or just plate voltage run
with bias, etc, and the tube lit, to further process.
73
John
K5PRO
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