Equivalent to the 6V6 / 6AY5. Tetrode tube, military equipment. Reflektor factory. OTK marking.
General characteristics:
* Anode voltage, V: 250;
* 1st grid voltage, V: -12.5;
* 2nd grid voltage, V: 250;
* Filament (heater) current, mA: 475±40;
* Anode current, mA: 46±13;
* 2nd grid current, mA: no more than 7.5;
* Mutual conductance, mA/V: 3 to 5.2;
* Output power, W: no less than 3.6;
* Internal resistance, kO: 5.2;
* Inter electrode capacitance, pF:
- input: 9.5±1.6;
- output: 3.8 to 9.2;
- transfer: no more than 0.9;
* Operation time, h: >1000.