KR AUDIO 300B

Directly Heated Power Triode Vacuum Tube

The KR Audio 300B is a high-power triode vacuum tube designed for high-quality audio amplification. It supports Class A1 operation and features a directly heated filament, low plate resistance, and a transconductance of 6.2 mA/V. With a typical operating point of 450 V plate voltage and 100 mA plate current, it is designed for compatible high-performance tube amplifier circuits.

Technical Specifications

• Tube Type: Power Triode
• Amplification Factor: 3.9
• Filament Voltage: 5 V ± 5%
• Filament Current: 1.2 A
• Maximum DC Plate Voltage: 550 V
• Maximum DC Plate Current: 120 mA
• Maximum Plate Dissipation: 50 W
• Typical Class A1 Plate Voltage: 450 V
• Typical Class A1 Plate Current: 100 mA
• Grid Voltage at Typical Operating Point: −90 V
• Transconductance: 6.2 mA/V
• Plate Resistance: 630 Ω