6F1P tube  (~ECF80 ~6BL8 ~6AX8) NOS Triod-pentode HiFi

Can be used for sound amplifiers.
2pcs in Lot!
Original vintage tubes.



Heater voltage, 6.3
The anode voltage of the transistor, in 100
Bias voltage on the grid triode In -2
Anode voltage pentode, in 170
The voltage on the second grid of the pentode, in 170
Bias voltage on the first grid of the pentode, in -2
Filament current, mA 430 + - 25
Current in the anode circuit of the transistor, mA 13 + - 5
Current in the anode circuit of the pentode, mA 10.5 + - 3.5
Current in the circuit of the second grid of the pentode, mA not more than 4
Transconductance of the transistor, mA / V 5 + - 1.5
Slope pentode, mA / V 6.2 + - 2.2
The gain of the transistor about 20
The internal resistance of the pentode, MW 0.4
Input impedance pentode at 50 MHz, k about 10
Input impedance pentode at 100 MHz, k about 2
Equivalent noise resistance of the pentode, k about 1.5




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