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http://www.zuoshi.com 12BH7 TJ FullMusic Classification- It is a Twin triode. It is a nine golden pins tube. Oxide coated of indirect heated. Application -It intended for use a voltage amplifier or Phase inuerter. Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, and 2. Fig 1 Fig 2 Nominal operating conditions and parameters Heater voltage ……………………………………………………………… 6.3V/12.6V Heater current ……………………………………………………………… 0.6A/0.3A Plate voltage ……………………………………………………………… 250V Grid voltage ………………………………………………………………… -8V Plater resistance ………………………………………………………… 7.7k Plate current ……………………………………………………………… 9mA Page 1 http://www.zuoshi.com http://www.zuoshi.com 12BH7 TJ FullMusic Amplification factor ……………………………………………………… 20 Characteristics-Average characteristics Figure 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply. Fig 3 Limiting Operation Conditions for Safe Nor simultaneous ratings Maximum plate voltage ………………………………………………… 300 V Maximum Grid voltage ………………………………………………… -50V Maximum Grid voltage ………………………………………………… 0V Maximum Power of plate ……………………………………………… 2.5W Page 2 http://www.zuoshi.com