Tube-number record
6524
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BrandRCA
ClassTwin Beam Power Tube
Base7-pin (non-miniature)
Filament6.3 V @ 1.25 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeGlass
Base MaterialGlass
SectionsTwin
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage600 V
Plate Dissipation25 W
Grid 2 Voltage300 V
Grid 1 Voltage-200 V
Cathode Current150 mA
H-C Voltage135 V
Audio Performance
Power Output57 W
Key Features
- Twin units
- High frequency operation up to 470 MHz
- Beam power structure
- Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier Class AB1 CCS | 400 V | 4500 | — | 8.5 | 25 mA |
| AF Power Amplifier Class AB1 ICAS | 600 V | — | — | — | 21 mA |
| RF Power Amplifier Class C Telegraphy CCS | 500 V | — | — | — |
Application Notes
Free circulation of air around the tube is required. Forced-air cooling may be required for maximum ratings.
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