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Tubes Notes from The Last Tube Collectors Association Magazine Dec 2019

kcline

kcline

Tube Audio Collector
This information is from AWA holdings of Dowd-RCA Archive published in the last issue of the TCA Dec 2019. RCA Tube "Salvage Schedules" 2A3, Low plate current shrinkage may be salvaged by tapping with hard felt hammer, Tap tube on dome in a plane parallel to the top mica while the AC test procedure has been interrupted, retest. 6J5 & 12J5 Low plate current shrinkage may be salvaged by bumping with the flat of the plate horizontal to a hard surface, retest. 6L6-G, Tubes rejected for high plate current may be reclaimed by bumping on a soft surface while cathode is hot. retest twice and quality tested after. Now some notes from the RCA Developmentals Standardizing Notices 27-3 series. Metal 2A3!! Code A-2016 a very large metal tube size MT12 shell, had a single plate and the 20-wire filament.
 
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