7731
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BrandCBS
ClassTriode-Pentode
BaseMiniature 9-pin
Filament6.3V @ 450mA
Construction
Primary TypeTriode-Pentode
EnvelopeT-6 1/2
Base MaterialGold plated base pins
Sections2
Filament / Heater
Heater NotesContinuous-wound coil heater
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- Gold plated base pins
- Continuous-wound coil heater
- Extreme reliability
- Stable characteristics
- Life tested transconductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode | 150V | 8500 | 5000 | 40 | 18mA |
| Pentode | 250V | 5200 | 400000 | - | 10mA |
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