Main technical characteristics for 6J4P:
Filament voltage 6.3±0.6 V
Filament current 300 ±25 mA
Nominal anode voltage (DC) 250 V
Anode voltage limit (constant) 300 V
Anode current 11 ±3.3 mA
Cathode current limit 20 mA
Reverse grid current of the first is no more than 0.5 µA
Grid voltage second nominal (constant) 150 V
Second limit grid voltage (constant) 150 V
Second grid current 4.5 ±1.7 mA
The maximum power dissipated by the anode is 3.5 W
Power dissipated by the second grid, maximum 0.9 W
Maximum voltage between cathode and heater (constant) 90 V
Characteristic slope 5.7 ±1.1 mA/V
Internal resistance about 0.9 MOhm
Cathode resistance for auto bias 68 ohms
The resistance in the grid circuit of the first boundary is 0.5 MOhm
Input capacitance 6.3 pF
Output capacitance 6.3 pF
Pass-through capacitance no more than 0.0035 pF
Miniature glass version
Durability of at least 5000 hours