It is my understanding that the 3-500Z has a filament heated getter that
is always active when the tube is on. Also, if it has a special coated
anode with gettering ability, then that is active. If the anode is one
of the reactive metals like tantalum, then it will also getter the tube.
From what I am hearing, the new graphite anodes have coatings that will
help, but I am not familiar with those.
So the answer is yes, there is always getter action on power tubes, not
just the flash getter that works during manufacture.
n 11/26/16 10:29 PM, firstname.lastname@example.org wrote:
Date: Sat, 26 Nov 2016 18:15:48 -0600
From: Lee <L@w0vt.us>
Subject: Re: [Amps] SB-220 update and gettering
Content-Type: text/plain; charset=windows-1252; format=flowed
OK I understand what you are saying. But, how does a graphite 3-500Z
tube get gettered after sitting around? You say heating the anode to
glow does not getter the tube. I realize the graphite tube was gettered
when manufactured. Since glass seals leak, can a graphite 3-500Z be
gettered again down the road or was it a one time deal at the factory?
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