Tube-number record
8121
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BrandRCA
ClassBeam Power Tube
BaseMagnal
Filament13.5 V @ 1.3 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal
Sections1
Filament / Heater
Heater NotesMinimum heating time: 60 seconds
Absolute Maximum Ratings
Plate Voltage2200 V
Plate Dissipation150 W
Grid 2 Voltage400 V
Grid 1 Voltage-100 V
Cathode Current300 mA
H-C Voltage150 V
Audio Performance
Key Features
- Forced-air cooled
- Ceramic-metal seals
- Coaxial-electrode structure
- Integral radiator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Linear RF Power Amplifier SSB (Two-Tone) | 1500 V | — | 3800 | 12 | 160 mA |
| RF Power Amplifier Class C Telegraphy (470 Mc) | 1500 V | — | — | — | 300 mA |
Application Notes
For CCS operation at frequencies up to 500 Mc. Useful for single-sideband suppressed-carrier service and RF power amplification.
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