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BrandMullard
ClassSpecial Quality Double Triode
BaseNoval B9A
Filament6.3V @ 600mA
Construction
Primary TypeDouble Triode
EnvelopeGlass
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesSuitable for parallel operation only, a.c. or d.c. Heater is centre-tapped.
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation4.4 W
Grid 1 Voltage-85 V
Cathode Current31 mA
H-C Voltage200 V
Audio Performance
Key Features
- Separate cathodes
- Stability of characteristics
- Long life
- Cut-off emission capability
- Shock and vibration resistant
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 250V | 5200 | 3850 | 20 | 14.5mA |
Application Notes
Designed for use in industrial equipment. Not intended for circuits critical with regard to hum, microphony or noise.
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