6K3 / 6SK7 FOTON Russian Pentode Military OTK Vacuum Tube USSR 5pcs NEW 1950-60's TESTED

Tubes never used, old stock, made at Factory FOTON in USSR
Equivalent to the 6SK7
Date: 1950-60's
Lot of 5 tubes. TESTED

REAL PHOTO!

6K3 tube parameters.
Glow current: 300 ± 25 mA.
Anode voltage: 250 V.
Second grid voltage: 100 V.
Voltage on the third grid: 0 V.
The bias voltage on the first grid is: -3 V.
Anode Current: 9.25 ± 2.75 mA.
The current in the circuit of the second grid: 2.5 ± 0.9 mA.
Slope: 2.0 ± 0.4 mA / V.
The steepness of the characteristic at Un = 5.7V> 1.3 mA / V.
The steepness at the beginning of the characteristic (Uc1 = -35V): 1..30 μA / V.

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