MATCHED pair 6J4 = 6F10, 6AC7. pentodes SVETLANA tubes. 1966,69.
Rhombus of military acceptance.
Advantages:
• high linearity;
• large gain, allowing to realize
single-stage voltage amplifier for driving the output triode 300V;
• low equivalent noise resistance (600...700 Ohm);
• low price;
• high mechanical strength.
TEST: Uh=6,3V, Ua=300V, Ug2=150V,Rk=160 Ohm
Tube №4  1969. Ia=9,4mA, Ig2=1,8mA, S=8,2mA/V
Tube №11 1966. Ia=9,4mA, Ig2=1,9mA, S=8,4mA/V


Pentode 6J 4 with a short characteristic is designed for high frequency voltage amplification

1 bottle
2 Glow (heater)
3 Third grid
4 First grid
5 Cathode
6 Second grid
7 Glow (heater)
8 Anode

Tube parameters 6J 4
(nominal mode)

Heating voltage 6.3V
Filament current 450±25mA
Anode voltage 300V
Voltage of the second grid 150V
Voltage on the third grid 0V
Cathode resistance for automatic bias 160Ω
Anode current 10.25±2.25mA
Current in the circuit of the second grid 2.2 ± 1.0 mA
Anode current at Ug 1=-6V <0.9mA
Seepness 9.0±2.0mA/V
Seepness at Uh =5.5V >5.5mA/V
Leakage current cathode-heater <20uA
Input impedance at frequencies 45-60MHz about 2.6KΩ
Internal resistance
1MΩ
Input capacitance 9.0±2.2pF
Output capacitance 5.0±1.5pF
Through capacitance <0.015pF
Service life 500h
Dimensions Ø33x67mm
Weight 40g

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