Tube-number record
12K1L
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ClassUniversal pentode
BaseSpecial / none
Filament12.6 V @ 75 mA
Construction
Primary TypePentode
EnvelopeGlass with external metal screen
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Grid 2 Voltage225 V
Cathode Current11 mA
H-C Voltage100 V
Audio Performance
Key Features
- Short characteristic curve
- Resistance to ambient temperature -60 to +70°C
- External metal screen
- Indirectly heated oxide-coated cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Pentode | 150 V | 1650 | 800000 | — | 2.35 mA |
Application Notes
Designed for amplification of voltage and power and for generation of high-frequency oscillation up to 200 MHz.
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