The EL3 of the red series is a 6.3 volts- version of the AL3, inclusively the round cathode, though with a straight tubular bulb with a narrowed upper section. As with AL3/AL4 before, after some months the EL3 was replaced with the
directly replaceable EL3N, with the more efficient profile-cathode, reduced heater current and the usual dome bulb [Jacob Roschÿ, 13 Feb 2003]
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Literature
Taschenbuch zum Röhren-Codex 1948/49
EL3N: Radio-Tubes, Societe des Editons Radio
Júlio Branco
EL3N: IM
Iven Müller
EL3N: RTT 1974 (Franzis) 13. Auflage
Martin Renz
EL3N: electron Tube Data sheets
Anonymous 810 Collector
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 134
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