EF 86, Tube EF86; Röhre EF 86 ID2011, Vacuum Pentode | Radiomuseum.org
Old Brimar EF86 tube to be used in a Bogen CHB14A conversion. What can I expect from a EF86 in comparison to the usual dual triode based preamps found in most guitar
Tube d'origine russe EH EF86 6J8, production directe, correspondance de précision - AliExpress
AmplitudeModulation
EF 86, Tube EF86; Röhre EF 86 ID2011, Vacuum Pentode | Radiomuseum.org