Funny ad for radiotubes...

TooManyGizmos

Flashlight Enthusiast
Joined
Jan 12, 2006
Messages
3,079
Location
Died Nov. 2015
;)
He is now going to re-seal them .......................

In non-breakable , food saver , seal-a-meal vacuum bags .


And claim ......*New & improved product* .... un-breakable !

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lctorana

Flashlight Enthusiast
Joined
Jun 28, 2007
Messages
2,123
Location
Melbourne, Australia
Now I know why those broken tubes developed a chalky white coating - it was a reaction between the getter material and the incoming air.
:huh:
Correct.

Speaking of gettering - you'll notice that very early radio tubes - things like UX201A and their ilk - often had very large amounts of gettering, enough to silver the entire inner surface of the tube.

Later valves, such as miniature valves for TV service, often had only a patch the size of a sixpence. This was enough, because of the better pumps availble by then to give a "harder" vacuum.
 
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