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811, Tube 811; Röhre 811 ID15412, Transmitting Triode, air c
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Vacuum Tube In Its 118th Year: Same Old Challenges | Nuts & Volts Magazine
1PC PSVANE 811A Triode Valve Tube Tested Replace 811 FU-811 for HiFi
1PC PSVANE 811A Triode Valve Tube Tested Replace 811 FU-811 for HiFi
572B @ The Valve Museum