Tube-number record
5992
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BrandBendix Red Bank
ClassReceiving Tubes
BaseOctal
Filament6.3 V @ 600 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT-9
Base MaterialMelamine
SectionsSingle
Filament / Heater
Warm-up Time45s
Heater NotesCoil type heater inside an extruded alumina insulator
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation12 W
Grid 2 Voltage275 V
H-C Voltage350 V
Audio Performance
Typical THD8%
Power Output4 W
Key Features
- Reliable vacuum tube
- Aircraft and industrial applications
- Rigid structure maintains stability under shock and vibration
- 45-hour run-in stabilization
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-tube, Class A | 180 V | 3500 | 55000 | — | 29 mA |
| Single-tube, Class A | 250 V | 4000 | 45000 | — | 45 mA |
| Single-tube, Class A | 300 V | 3500 | 55000 | — | 34 mA |
Application Notes
Each tube is given a 45-hour run-in under overload, vibration, and shock conditions to reduce early failures.
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