Tube-number record
12K8GT
0 archive entries
12K8GT is a tube type in the TubeDatabase archive (class: Triode Hexode Converter). Recorded specifications: brand TUNG-SOL, year 1941, construction Multi-section, base Metal Shell, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 0.75 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassTriode Hexode Converter
BaseOctal
Filament12.6 V @ 0.15 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialMetal Shell
SectionsTwo
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation0.75 W
Grid 2 Voltage150 V
Cathode Current16 mA
Audio Performance
Key Features
- Reduced interaction between oscillator and mixer
- Stable operation on high frequencies
- Broadband band performance
- Uni-potential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Converter Service (100V) | 100 V | 325 | 400000 | — | 2.3 mA |
| Converter Service (250V) | 250 V | 350 | 600000 | — | 2.5 mA |
Application Notes
Used in AC-DC superheterodynes using 150 mA heater tubes.
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