572B
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BrandO'MALLEY
ClassZero Bias Power Triode
Base4 pin (Johnson 122-224 or National XC4CIR4)
Construction
Primary TypeTriode
EnvelopeNonex-hard glass
SectionsSingle
Filament / Heater
MaterialBonded Thoria
Absolute Maximum Ratings
Plate Voltage2500 V
Plate Dissipation225 W
Cathode Current290 mA
Audio Performance
Power Output730 W
Key Features
- Zero Bias Power Triode
- Direct plug-in replacement for 811A
- 225 Watts plate dissipation
- 300% increase plate dissipation over 811A
- Zirconium impregnated graphite anode
- Rugged bonded thoria filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B-SSB | 2400V | - | 6900 | 190 | 225mA |
| Class B Audio (2 tubes) | 2500V | - | 15000 | 190 | 400mA |
| Class C Telegraphy | 2000V | - | - | 190 | 200mA |
Application Notes
Can be mounted base up or base down. If horizontal, filament and grid should be in a vertical plane. Blower recommended if air circulation is restricted.
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