EQ40 and EQ80
6BX6, Tube 6BX6; Röhre 6BX6 ID19331, Vacuum Pentode | Radiomuseum.org
EF80 vs EF86 | diyAudio
EF80 - anyone tried it as an audio amp? - UK Vintage Radio Repair and Restoration Discussion Forum
SM5CBW - Tubedata
File:EF80 Tungsram.jpg - Wikimedia Commons
EF80 CV1376 MULLARD NOS VALVE TUBE - Langrex
Drawing Load Lines
EF 89, Tube EF89; Röhre EF 89 ID841, Vacuum Pentode | Radiomuseum.org
6BX6, Tube 6BX6; Röhre 6BX6 ID19331, Vacuum Pentode | Radiomuseum.org
SM5CBW - Tubedata
Experimental Spot Wobble
Electron Tubes | EF80 / EF 80
EF80 Datasheet PDF (746 KB) Philips | Pobierz z Elenota.pl
EF80 | PHILIPS | PENTODE AUDIO TUBE At 4 € HT on Electols
EF80 - doctsf.com, base documentaire lampes (tubes)
EF80 Datasheet, Pentode 1953.
FOR SALE - EF80 (Matched Pair 2) - MV Audio Labs
Drawing Load Lines
EF804 Datasheet | Pentode
EF80 - Pentode 1953
Low watt p/p amp gallery
Radio Tube EF80 Lorenz #455 | M-Ware
EF80 @ The Valve Museum
