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Biggest oscilloscope tube

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Wrenches of Death:

--- Quote from: edavid on April 25, 2023, 02:41:57 pm ---
This isn't a complete oscilloscope, but the largest electrostatic deflection CRT I know of was the HP 1321A 21" XYZ monitor.


--- End quote ---

I've never seen an electrostatic type CRT that large. How deep was it?
 
thanks!
WoD

edavid:

--- Quote from: Wrenches of Death on April 25, 2023, 02:45:06 pm ---
--- Quote from: edavid on April 25, 2023, 02:41:57 pm ---
This isn't a complete oscilloscope, but the largest electrostatic deflection CRT I know of was the HP 1321A 21" XYZ monitor.


--- End quote ---

I've never seen an electrostatic type CRT that large. How deep was it?

--- End quote ---

The cabinet was 25" deep.  It only has 5MHz bandwidth so it could have a fairly wide deflection angle.

N2IXK:
DuMont made a small number of classroom demonstrator scopes with a 20" electrostatic CRT.  They used a green phosphor (P1) version of their 20AP4 television CRT:

https://www.earlytelevision.org/images/dumont_20ap4.jpg

alm:
If anything, the deeper the tube and the smaller the surface (small deflection angle), the higher the bandwidth. See this description of a 13 GHz scan convertor CRT which was over 3 meters deep. So a CRT with big surface area would make for a low bandwidth scope.

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