Keywords: 955ACORN.jpg 955 R C A Acorn V H F triode thermionic valve/electron tube with TO-72 transistor for comparison 188KB own 2009-03-31 Andrew Kevin Pullen en wikipedia Globe Collector original upload log page en wikipedia 955ACORN jpg 2009-04-04 13 44 Globe Collector 1646×1225× 192770 bytes <nowiki>955 R C A Acorn V H F triode thermionic valve/electron tube with coin and TO-72 transistor for comparison 188KB Author Andrew Kevin Pullen Created 31st Match 2009 Source My own work </nowiki> Vacuum triodes Acorn tubes |