2PCS 6F6S / 6F6G Pentode Tubes! NOS! OTK! RARE 60's! 

Tubes was made in  60'S by famous Novosibirsk military plant in USSR and have OTK test marking.

The 6F6S Pentode is designed for Power Amplification in Output Sdages of Low-Frequency Amplifiers. The 6F6S Pentodes are enclosed in Glass Bulb and are providet with an Octal Base and an Indirectly Heated Oxide-Coated Cathode.

Main technical characteristics 6F6S :

• Heater voltage,V ...... 6.3

• Heater current, mA ...... 700

• The voltage at the anode , V ...... 250

• The voltage on the second grid , V ...... 250

• The bias voltage on the first grid , V ...... -16.5

• The current in the anode circuit , mA ...... 34

• The current in the circuit of the second grid , mA ...... 7

• Slope , mA / V ...... 2.5

• Internal resistance, ohms ...... 78

• Load resistance, ohms ...... 7

• Output power, W ...... 3.2

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