Rebuilding electrostatic CRTs

[N2IXK]

I cant see why it would be "impossible" to do, but in general it wasn't done because electrostatic tubes were generally used in inexpensive sets, and the tubes themselves were relatively inexpensive back in the day, compared to the larger screen EM types.

Because these types weren't generally rebuilt "back in the day", there aren't likely to be any stocks of replacement guns floating around anywhere.

It should certainly be possible to rebuild the old gun with a new heater and cathode, though.

[Eric H]

I think tubes like the 7JP4 may be made of Pyrex?