Tube-number record
475
0 archive entries
475 is a tube type in the TubeDatabase archive (class: Duplex-Diode High-Mu Triode). Recorded specifications: construction Triode, socket 6-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
ClassDuplex-Diode High-Mu Triode
Base6-pin
Filament6.3 V @ 0.3 mA
Construction
Primary TypeTriode
EnvelopeST-12
Sections3
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250 V | 1035 | 91000 | 100 | 0.8 mA |
Application Notes
The 475 is functionally equivalent to the type 75 tube, used as a combined detector, amplifier, and AVC tube.
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