Tested with a L1-3 tube tester. The measurement results correspond to the parameters indicated by the manufacturer.

  Double triode for voltage amplification of low-frequency and work in the relaxation schemes.

The oxide cathode of indirect filament.
Works in any position.
Weight 50 g.

 Main technical characteristics :

• Filament voltage ..... 6,3 ±0,6 V
• Filament current ..... 600 ± 50mA
• The voltage of the anode nominal ..... 250 V
• The voltage of the anode limit ..... 330 V
• Voltage grid nominal ..... -8 V
• Anode current ..... 9 ±3,5 mA
• Most power dissipation at the anode of the triode ..... 2,75 W
• The highest DC voltage between the cathode and the heater ..... 100
• The highest leakage current between the cathode and the heater ..... 20 µa
• The steepness ..... 2,6 ±0,53 mA/V
• Internal resistance ..... 7700 Ohms
• Gain ..... 20,5 ±2,5
• The largest current of the cathode ..... 20 mA