You will find the flashed getters on the back of the tubes, but not on
all. Only SH4, SH5 do have these (The "SH" designation are my own
designations and stand for "shape", I need that for my tube matching
system) there are 7 known shapes of the B-5025 tubes.
Dieter
Am 26.06.2012 09:16, schrieb Dalibor Farnı:
Hi Dieter,
I don't see any flashed metal in B-5025, just some stripes of metal on
the top. What I understand under term "flashing getter":
"Flash gettering means, chemically active, comparatively volatile
metals-mostly metals of the alkaline earth group are evaporated by
heating their supports at the conclusion of the pumping process. The
metal vapor before and during condensation reacts instantaneously with
all other than noble gaseous residues and forms on all cold parts of the
tube, particularly on the tube walls, the so-called getter mirror."
Dalibor
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