Tube-number record
6889
1 archive entry
BrandBendix
ClassReceiving Tubes
BaseOctal
Filament6.3 V @ 1.2 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeNonex Glass T-11
Base MaterialGlass filled Mica
Sections1
Filament / Heater
MaterialPure Tungsten
Warm-up Time45s
Heater NotesHelical heater with high purity aluminum oxide insulator
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation30 W
Grid 2 Voltage850 V
Grid 1 Voltage5 V
Cathode Current125 mA
H-C Voltage450 V
Audio Performance
Key Features
- Hard glass bulb
- Tungsten stem seal
- Ceramic shield
- Pulse application conditioning
- High perveance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250 V | 5400 | — | — | 74 mA |
Application Notes
Designed for aircraft, military and industrial applications where high levels of vibration and shock are encountered. Avoid designs where the tube is subjected to all maximum ratings simultaneously.