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02-08-2018, 08:57 AM

Kevin Kuehn Kevin Kuehn is offline

Workin' Late Again

Join Date: Jan 2011

Location: WI

Posts: 3,976

Quote:

Originally Posted by dieseljeep

All the CRT's of the time, aluminized or not used ion traps.
The straight gun types, which became popular in the later 50's, 21CBP4 et al didn't need an ion trap.

I thought the 10FP4 and 12KP4 appeared around 1949?

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