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History timeline | Timetoast timelines
A New English All-Metal Tube, August 1933 Radio-Craft - RF Cafe
The Tube Family Tree, Part 2, June 1963 Popular Electronics - RF Cafe
811A Tube | eBay
811A tube 572B tube history – W8JI Website
811A tube 572B tube history – W8JI Website
811A tube 572B tube history – W8JI Website