572B
High-Mu Power Triode – RF & AUDIO
High Dissipation Graphite Anode – Ideal for HF Linear Amplifiers
CONSTRUCTION EXCELLENCE AND RELIABILITY
• SUPERIOR ANODE DISSIPATION: Robust structure designed to withstand heavy duty cycles without thermal deformation, ensuring a long operational life.
• DUAL APPLICATION: Optimized for both radio frequency use (up to HF frequencies in Class AB2 or B linear amplifiers) and high-end radiant tube Hi-Fi audio amplifier output stages.
• HIGH AMPLIFICATION FACTOR (MU): Allows for high power gains with minimal input drive requirements.
Maximum Performance in HF Linears and Audio Systems
The 572B thermionic valve is a high-gain, direct-heated power triode, widely used in the repair, restoration, and upgrade of well-known amateur radio linear amplifiers (such as the classic YAESU FL-2100, Heathkit SB-200, or similar) and in sought-after radiant audio projects. Thanks to its extraordinary linearity and tolerance to temporary overcurrents, it ensures a clean signal, optimal efficiency, and exceptional operating stability on test benches and in the most demanding radio stations.
FILAMENT VOLTAGE
6.3 Vac / Vdc
MAX ANODE DISSIPATION
160 W
Reference Technical Specifications
| Characteristic Parameter | Nominal Value / Limit |
|---|---|
| Component Type | High-Mu Power Triode |
| Heating | Direct (Thoriated Tungsten Filament) |
| Filament Current | 4.0 A |
| Amplification Factor (µ) | 160 |
| Maximum Anode Voltage (DC) | 2750 V |
| Maximum Anode Current | 275 mA |
| Socket / Base Type | Super Jumbo 4-pin (4-Pin Ceramic) with top cap (Anode) |
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