Tube-number record
7842
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BrandRCA
ClassBeam Power Tube
BaseCoaxial
Filament6.3 V @ 3200 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal
Base MaterialMetal
Sections1
Filament / Heater
Heater NotesMatrix-type, oxide-coated, unipotential cathode
Absolute Maximum Ratings
Plate Voltage1000 V
Grid 2 Voltage300 V
Grid 1 Voltage-100 V
Cathode Current180 mA
Audio Performance
Power Output140 W
Key Features
- Ceramic-metal seals
- Coaxial-electrode structure
- One-piece electrode design
- Integral conduction cylinder
- Conduction cooled
- Matrix-type cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier & Modulator - Class AB1 (Push-Pull, per tube values) | 850 V | — | — | 18 | 100 mA |
| AF Power Amplifier & Modulator - Class AB2 (Push-Pull, per tube values) | 850 V | — | — | 18 | 177.5 mA |
| RF Power Amplifier & Oscillator - Class C Telegraphy (At 1215 Mc) | 900 V | — | — | — | 170 mA |
Application Notes
Specifically designed for use at frequencies up to 2000 Mc under conditions of severe shock and vibration. Requires conduction cooling via thermal coupling to a heat sink.
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