Tube-number record
RH6C / 8412
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BrandSiemens
ClassPlanar Triode
BaseSpecial / none
Filament6 V @ 800 mA
Construction
Primary TypeTriode
EnvelopeMetal-Ceramic
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated; metal dispenser cathode. Heater voltage reduction recommended for cathode currents under 70 mA.
Absolute Maximum Ratings
Plate Voltage600 V
Plate Dissipation30 W
Grid 1 Voltage-50 V
Cathode Current75 mA
Audio Performance
Key Features
- Air-cooled
- Disk-seal design
- Metal-ceramic construction
- For oscillators, multipliers, and amplifiers
- Operable without air cooling below 10W dissipation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Characteristics | 420 V | 16000 | — | 60 | 60 mA |
| CW Oscillator (4 Gc) | 420 V | — | — | — | 60 mA |
| Amplifier (1 Gc) | 400 V | — | — | — | 60 mA |
Application Notes
The RH6C is designed for high-frequency applications up to 7 GHz. It features a radiator for air cooling connected to the plate. For operation at less than 70mA cathode current, heater voltage should be reduced to maximize tube life. Rotation-symmetrical plate circuits are required above 5 GHz.
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