Tube-number record
C30
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BrandSiemens
ClassPentode
BaseSpecial / none
Filament6.3 V @ 400 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating; suitable for parallel or series supply.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation4 W
Grid 2 Voltage300 V
Cathode Current30 mA
H-C Voltage120 V
Audio Performance
Typical THD10%
Power Output1.5 W
Key Features
- Long life (> 10,000 hrs)
- High reliability
- Tight tolerances
- Special cathode without interface layer
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 220 V | 6500 | 250000 | 19 | 16 mA |
| Triode (g2 and g3 to plate) | 220 V | 7200 | 2500 | 18 | 18.5 mA |
Application Notes
Universal pentode for wideband communication systems, suitable for LF, IF, and HF amplifiers in pre- and power stages, oscillators, mixers, and control amplifiers.
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