CRT implosions (was: Re: "screen mold")

William Donzelli aw288 at
Wed Oct 5 14:34:56 CDT 2005

Fact Check...

> Tubes typical of that era was the smaller electrostatic types and 5up1/7
> were of the era.

Electromagnetic (and combo) tubes were just as common starting in the
1940s. If a tube had a P7 phosphor, it was likely intented for PPI duty,
and nearly all PPI scopes of the era were rotating yoke types.

>  The aviation tubes used for that airborne radar were
> surrounded by a mumetal shield to keep mag fields out and the graticule
> was far thicker than the tube.

Graticle thickness not far thicker than the tube face in many
instances. Most actually were probably thinner. They varied from 3/16
inch to just a very thin sheet, maybe just a few thousandths thick.

> Tubes larger than about 10" 
> didn't appear much till the mid 50s.

12 inch tubes were very common before 1950. Just about ever World War 2
Allied air search radar had one (or in the case of late war types, two).

William Donzelli
aw288 at

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