572B Tube Operating Temperatures and Data
572B Tube Operating Temperatures and Data The 572B tube is a high-mu power triode designed for RF and audio amplification, relying primarily on radiation and forced-air convection for cooling. Key Thermal and Electrical Data: Maximum Envelope (Glass) Temperature: 250°C . Exceeding this limit risks softening the glass seal and causing vacuum failure. Plate Dissipation: Continuous (ICAS): 160 Watts per tube (some modern import versions are conservatively rated at 65–125 Watts due to thinner anode material). Peak (CCS): Higher short-term dissipation is possible, but modern tubes have reduced thermal mass compared to vintage US-made versions, limiting overload tolerance to seconds rather than minutes. Cooling Method: Radiation and Forced Air . The tube is not designed for conduction cooling through the base. Base Type: Ceramic (to withstand high temperatures), but the seal between the ceramic and glass envelope is the thermal weak point. 572B v...