6F4P

The 6F4P (6Ф4П rus.) triode-pentode tube is designed for use in the output stages of video amplifiers and low-frequency power amplifiers (pentode section), in automatic gain control (AGC) circuits, and in preamplifiers of television and radio broadcast receivers (triode section).

6F4P is equivalent to tubes: ECL84, 6DX8 and 6DQ8.

• Stamp of technical control department of the manufacturer ” ОТК “

Technical specifications:

Basic Data:

• Nominal Filament Voltage (DC or AC): 6.3V
• Maximum Filament Voltage (DC or AC): 6.9V
• Lowest Filament Voltage (DC or AC): 5.7V
• Filament Current: 720mA ± 60mA

Triode part:

• Nominal Anode Voltage (DC): 200V
• Limiting Anode Voltage (DC): 250V
• Maximum anode voltage (constant) of a cold tube: 550V
• Anode current: 3mA ± 0.9mA
• Maximum cathode current: 12mA
• Maximum power dissipated by the anode: 1W
• Maximum voltage between the cathode and the heater (constant):
• at positive heater potential: 150V
• at negative heater potential: 200V
• Slope of the characteristic: 4mA ± 1mA
• Gain: 65
• Cathode circuit resistance for automatic bias: 600Ohm
• Limiting grid circuit resistance: 1MOhm
• Input capacitance: 4pF
• Output capacitance: 0.6pF
• Transmission capacitance: 2.7pF

Pentode part:

• Nominal anode voltage (DC): 170V
• Limiting anode voltage (DC): 250V
• Limiting anode voltage (constant) of cold tube: 550V
• Anode current: 18mAh
• Limiting cathode current: 40mA
• Nominal second grid voltage (constant): 170V
• Limiting second grid voltage (constant): 250V
• Limiting second grid voltage (constant) of cold tube: 550V
• Second grid current: no more than 7mA
• Maximum power dissipated by the anode: 4W
• Maximum power dissipated by grid 2: 1.7W
• Slope of characteristic: 11mA ± 2.5mA
• Internal resistance: 100kOhm
• Cathode circuit resistance for automatic bias: 100Ohm
• Maximum resistance in grid 1 circuit: 1MOhm
• Input capacitance: 9.5pF
• Output capacitance: 4pF
• Transmission capacitance: no more than 0.1pF

The minimum operating time is not less than 5000 hours.