Tube-number record
6884
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BrandRCA
ClassBeam Power Tube
BaseCoaxial
Filament26.5 V @ 540 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal
Base MaterialMetal
Sections1
Filament / Heater
Heater NotesHeater voltage should be reduced depending on operating conditions and frequency to prevent overheating the cathode due to back bombardment.
Absolute Maximum Ratings
Plate Voltage1000 V
Grid 2 Voltage300 V
Cathode Current180 mA
Audio Performance
Power Output80 W
Key Features
- Cermolox Type
- Forced-air Cooled
- Integral Radiator
- Coaxial-Electrode Structure
- Ceramic-Metal Seals
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid-driven coaxial-cavity class C amplifier | 1000 V | — | — | — | 180 mA |
Application Notes
The 6884 is the same as the 6816 except for heater voltage. Heater voltage reduction is required at higher frequencies to counteract cathode back bombardment.
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