tube getters / was Re: 1966 Mag: Build NE-2 Neon Bulb Computer

[dwight elvey]

>From: Brent Hilpert <hilpert at cs.ubc.ca>
---snip---
>
>BTW: The U-shaped ring is a ring so that after the tube has been vacuummed 
>&
>sealed, it can be inductively heated from the outside (forms a 
>single-winding
>secondary of a transformer) to fire the getter. If you look at a variety of
>tubes the getter splash is on the envelope opposite the ring, be it the top 
>of
>the envelope or somewhere on the side, and the open side of the U faces the
>envelope so the getter will fire out onto the envelope rather than the
>electrodes. In really old (1920s) tubes the ring was a small cup holding 
>the
>unfired getter instead.

Hi
On really old tubes it was just painted onto the glass pedistal that held
the feed thru's. I have a number of these.
Dwight

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