Tube-number record
7731
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BrandCBS
ClassTriode-Pentode
BaseNoval (B9A)
Filament6.3 V @ 450 mA
Construction
Primary TypeMulti-section
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 | 150 V | 8500 | 5000 | 40 | 18 mA |
| Pentode | 250 V | 5200 | 400000 | — | 10 mA |
Datasheets
Datasheet: 7731.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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