Tube-number record
8891
0 archive entries
8891 is a tube type in the TubeDatabase archive (class: Beam Power Tube). Recorded specifications: brand RCA, year 1971, construction Beam tetrode / beam power, base Metal, socket Coaxial, maximum plate voltage 10000 V, and maximum plate dissipation 15000 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassBeam Power Tube
BaseCoaxial
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal (Cermolox)
Base MaterialMetal
Sections1
Filament / Heater
MaterialThoriated-Tungsten Mesh
Warm-up Time15s
Absolute Maximum Ratings
Plate Voltage10000 V
Plate Dissipation15000 W
Grid 2 Voltage2000 V
Grid 1 Voltage-600 V
Cathode Current6000 mA
Audio Performance
Key Features
- Cermolox Construction
- Thoriated-Tungsten Mesh Cathode
- Integral Radiator
- Forced-Air Cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Television Service (Cathode-drive, 216 MHz) | 6580 V | — | — | 12.5 | 4820 mA |
| Linear RF Power Amplifier Class AB (7 MHz) | 8000 V | — | — | 12.5 | 3910 mA |
| Class AB or Class B Telephony (400 MHz) | 8000 V | — | — | 12.5 |
Application Notes
Full input to 400 MHz. Designed for VHF-TV band applications at 13 dB gain. Requires forced-air cooling through radiator to limit plate core temperature to 250C.
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