Features: The 6146B is power beam tetrode excelling in both RFs amplification (25-35W output) and high end sound applications, delivering warm tube driven sound with militarys grade durability for demanding communication systems and audiophile setups. Featuring base design and enhanced electrode construction, this vacuum tube operates efficiently at 400-600V anodes voltages while maintaining stability under high frequency HF band operations. Essential for radio enthusiasts restoring vintage transmitters, aviation technicians servicing legacys communication gear, and sound engineers building premium push pull amplifiers requiring authentic tube tonals characteristics. Optimized for HF linears amplifiers in amateur radio stations, emergence communication systems, and audiophile grade sound systems where power handling and harmonics rich output are critical. As direct upgrades to 807/EL519 tubes, this militarys 6146B combines Cold War radio heritages with modern component reliability, for both vintage KWM 2 transceivers and contemporary sound amplifier projects. Specifications: Materials: Glass Metal Size: 101×44mm Anodes voltages: 600V Second gate voltages: 250V Anodes dissipation power: 25W Package Includes: 1PC 6146B Electronic Tube note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.