12K4
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ClassHigh-frequency pentode
BaseOctal
Filament12.6V @ 150mA
Construction
Primary TypePentode
EnvelopeMetal
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated oxide-coated cathode
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3.3 W
Grid 2 Voltage220 V
H-C Voltage100 V
Audio Performance
Key Features
- Tailed characteristic curve
- Remote cut-off
- Metal envelope
- Octal base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| High-frequency amplification | 250V | 4700 | - | - | 7.8mA |
Application Notes
Designed for amplification of high-frequency voltage. Resistant to mechanical vibration up to 6g and ambient temperatures from -60 to +70°C.
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