6R4P

The Russian 6R4P (6P4П rus.) tube is a dual pentode for use as a low-frequency and video signal amplifier (first pentode), LF and intermediate-frequency voltage amplification and generation, a sync pulse selector, and a keyed AGC detector (second pentode), and in radio equipment. The cathode is indirectly heated oxide. Base – 10 pin.

Close analogues of 6R4P are tubes EL36, 6CM5.

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

Main parameters: first pentode at Un = 6.3V, Ua = Uc2 = 180V; second pentode at Un = 6.3V, Ua = 200V, Uc2 = 150V:

• Heat current: first pentode 840mA ± 60mA; second pentode 840mA ± 60mA
• Anode current: first pentode 30mA; 2nd pentode 10mA
• Second grid current: 1st pentode 7mA; 2nd pentode 2.8mA
• First grid reverse current: 1st pentode no more than 1µA; 2nd pentode no more than 0.8µA
• Slope: 1st pentode 21mA/V; 2nd pentode 8.5mA/V
• Cathode resistance for automatic bias: 1st pentode 75Ohm; 2nd pentode 130Ohm
• Vibration noise voltage: 1st pentode no more than 150mV; 2nd pentode no more than 300mV
• Interelectrode capacitances:
• Input 1st pentode 13pF; 2nd pentode 10pF
• Output: 1st pentode 7pF; 2nd pentode 11pF
• Transmission: 1st pentode 0.1pF; 2nd pentode 0.14pF
• Between cathodes: 1st pentode no more than 0.15pF; 2nd pentode no more than 0.15pF
  Output power: 1st pentode not less than 2.4W

Maximum operating data:

• Filament voltage: 5.7V to 6.9V
• Anode voltage of each pentode: 250V; without current draw: 550V
• Second grid voltage of each pentode: 250V; Without current draw: 550V
• Voltage between the cathode and the heater of each pentode: – 200V
• Power dissipated by the anode: 1st pentode 7.3W; 2nd pentode 2.8W
• Power dissipated by the second grid: 1st pentode 2.5W; 2nd pentode 0.65W
• Maximum cathode current: 1st pentode 16mA; 2nd pentode 60 mA
• Resistance in the first grid circuit: 1st pentode 0.5MOhm; 2nd pentode 1MOhm
• Ambient operating temperature range: -60°C to +70°C

Service life: at least 5000 hours