6J8 is a Russian HF pentode tube. The tube is covered with black metal screen. Equivalents to the 6SJ7.

Name: 6J8;

Type: HF pentode;

Application: HF voltage amplification;

Cathode type: oxide, indirect heating;

Envelope: metal;

Mass, g: 42;

Filament voltage, V: 6,3;

Filament current, A: 0,275-0,325;

Anode voltage, V: 250;

Anode current, A: 0,002-0,004;

Anode power, W: 2,8;

Grid1 voltage, V: minus3;

Grid2 voltage, V: 100;

Grid3 voltage, V: 0;

Steepness, mA/V: 1,3-2,0;

Reverse grid current, uA: 0,5;

Microphnic noise, mV: 100;

Socket type: rsh5-1.