Vf 4 Volt / If 0.9 Ampere / Half indirect / Battery =
Descrizione
According to the attached data sheet, the Philips E 414 is a special indirectly heated triode for microphone amplifiers. It is normally supplied with a B4 socket, with the cathode connected to the heater. Babani and other tube tables mention a B5 socket. Not to be confused with Triotron's E 414, which is a directly heated battery tube.
- - Manufacturers Literature 1930
Babani, International Radio Tube Encyclopaedia p. 100 & 101
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
E414_Philips: Peter den Boer
Wolfgang Holtmann
Just Qvigstad
E414_Philips: own collection
Peter den Boer † 2025
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