Tube-number record
6900
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6900 is a tube type in the TubeDatabase archive (class: Medium Mu Twin Triode). Recorded specifications: brand Bendix Red Bank, construction Dual triode, base Gold Plated Pins, socket Noval (B9A), maximum plate voltage 600 V, and maximum plate dissipation 4.25 W. The archive does not yet hold a photographed example of this type.
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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