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If you can't find any 21" replacements, send me the number and I'll check if any of my 21" spares are can sub. I can bring one to the ETF meet.
The set appears to use a 21AT,AL or a 21CBP4 can be used.
Electrostatic 90 degree CRT. The only set that I seen that used 2D21 gas thryratrons in the remote circuit.