Quote:
Originally Posted by compucat
I have one of those RCA 8" personal portables and the 8DP4 tube is not aluminized either. The set uses an ion trap.
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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.
