Tube-number record
FD-422
0 archive entries
FD-422 is a tube type in the TubeDatabase archive (class: Power Pentode). Recorded specifications: construction Pentode, maximum plate voltage 750 V, and maximum plate dissipation 30 W. The archive does not yet hold a photographed example of this type.
ClassPower Pentode
Filament6.3 V @ 1520 mA
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesCurrent tolerance: +/- 0.2A
Absolute Maximum Ratings
Plate Voltage750 V
Plate Dissipation30 W
Grid 2 Voltage250 V
Cathode Current100 mA
Audio Performance
Power Output10.5 W
Key Features
- Directly heated power pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 250 V | 5500 | — | — | 60 mA |
Application Notes
Commonly used in transmitter or audio power stages.
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