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#19

04-27-2013, 01:24 AM

David Roper David Roper is offline

console lover

Join Date: Feb 2005

Posts: 1,986

Miniature tubes were developed by RCA and the very first few, a complement of 1-volt filament tubes for battery portables, were introduced in 1939. Advertising for the first RCA radio to use them referred to the tubes as "tynitrons".

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