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My take on gettering / gas contamination, or the lack thereof, is that it mainly came from a station who was trying to explain big-bang arcing in the output sections of HF/MF amplifiers by a means

The evidence is that they strike glass, causing it ti fluoresce. I've seen 4-1000As with glass that turned pale brown where electrons had been banging it. R L MEASURES, AG6K. 805-386-3734 r@...

quite, provided the magnet is on a long enough, insulated stick. R L MEASURES, AG

wrote: working... as long as the fil is lit. HV + drive are not part of the overall gettering process. 4CX-10,000J... don't come whining to me ! use 48 hrs to getter a new/rebuilt tube.... and

Jim, Below is a quote from Terman on this subject. "Zirconium is also a useful metal in this regard. Zirconium at 1400 deg C will absorb copius quantities of such gasses as oxygen, nitrogen, carbon

getters like it have applied ### No I have not. 1 e-mail to eimac ought end the discussion . Rauch claims amperex etc... all use zirconium coated anodes... and gettwring is done when tubes shoe

wrote: the emission and then current flows? ### anode/grid current/drive power has nothing to do with emmision. Take 2 x identical linear's..... one with just the fil /blower on.[no HV no drive

That's an excellent idea Bill. I will have to try that the next time I test GS-35B's. Don't know if I will be able to see much with the ceramic but I would bet it would be easy to see with glass

ORIGINAL MESSAGE: ------------ REPLY FOLLOWS ------------ Perhaps so, but if they can accelerate to a certain speed in the half inch or so between cathode and anode, why could they not decelerate an

ORIGINAL MESSAGE: <w4zt-060920@...> wrote: ------------ REPLY FOLLOWS ------------ One way to prove it once and for all would be to try to deflect the beam with a magnet. Electrons would be

I use HN connectors for high voltage and use RG213 as a conductor. the chassis side I found a mate with a long leakage path. wa1gfz pentalab <jim.thomson@...> wrote: --- In

They can't reverse direction quick enough? R L MEASURES, AG6K. 805-386-3734 r@...

the rays glass. I've seen this in sweep tubes also many times. The glass had a blue glow in places where there were holes open in the anode. I think

Gettering of those and similar tubes is done by the anode coating. One reason they have to be driven red, which is about 800°C 73 Peter ________________________________ Subject: [ham_amplifiers] Re:

Jim, Did you ever get to speak to anyone at Eimac about where the getters were at in a 3-500Z? That's a question I'd say a few of us would like to find out about as I think there is some erroneous

Hi Jim, I understand that tube life is dependend on their vacuum and on the emission from the cathode such that material of it disappears until worn, and then the tube is probably send in for a new

Bill Turner wrote: <snip> They're moving too fast to circle back in that distance. We had a discussion about fluorescence in ceramic tubes some time back and I posted a few pictures of GS-35B's

ORIGINAL MESSAGE: ------------ REPLY FOLLOWS ------------ Wouldn't electrons which "miss" the anode be immediately attracted back to the outside of the anode? Why would they continue out to the glass

I have seen this on 807s running at 750v with this glow on Tx. Soft X-rays are more like >10,000v. As I see it, the effect is caused by electrons from the cathode missing the anode, striking the

If this is the case, why not use the tubes as they are being gettered? This has always been the way that I have done it. Yes