Tube-number record
6900
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BrandBendix Red Bank
ClassMedium Mu Twin Triode
BaseNoval (B9A)
Filament6.3 V @ 1000 mA
Construction
Primary TypeDual triode
EnvelopeT6
Base MaterialGold Plated Pins
Sections2
Filament / Heater
MaterialTungsten
Warm-up Time45s
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage600 V
Plate Dissipation4.25 W
Grid 1 Voltage-100 V
Cathode Current4500 mA
H-C Voltage500 V
Audio Performance
Key Features
- Hard glass bulb
- Tungsten stem seal
- Ceramic spacers
- Multi-pillar supports
- Pulsed grid-drive capabilities
- High ambient temperature operation
- Gold plated pins
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pulsed Operation | 500 V | — | — | — | 4250 mA |
| Static Operation | 120 V | 11500 | — | 18.5 | 36 mA |
Application Notes
Specifically designed for pulse applications in missiles, aircraft, and military/industrial installations. Reliability is impaired if maximum bulb temperature is exceeded.
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