MATCHED PAIR 6F1P (ECF80, 6BL8, 6AX8) triode - pentode. 1968 SAME DATE. 
Triode-pentode with separate indirectly heated cathodes for generating, converting and amplifying high frequency voltage, as well as for use in pulse circuits .
TEST TRIODE: Uh=6,3V, Ug1=-2V, Ua=100V
№2. 1968. Ia=12,4mA, S=4,9mA/V
№5. 1968. Ia=12mA,    S=4,9mA/V

TEST PENTODE: Uh=6,3V, Ug1=-2V, Ua=170V, Ug2=170V
№2. Ia=11,6mA, S=6mA/V, Ig2=3,2mA
№5. Ia=11mA, S=5,8mA/V, Ig2=2,7mA

1 triode anode
2 first pentode grid
3 second pentode grid
4 heat
5 heat
6 pentode anode
7 cathode and third pentode grid, screen
8 triode cathode
9 triode grid

6F1P triode parameters:
Nominal anode voltage 100V
Maximum anode voltage 250V
Grid voltage nominal -2V
Anode current 13±5mA
Cathode current limit 14mA
Power at the anode, maximum 1.5 W
Steepness 5.0±1.5mA/V
Gain about 20
The maximum resistance in the grid circuit is 500 Kom
Cathode-heater voltage limit 100V
Input capacitance 2.5±0.5pF
Output capacitance 0.3pF
Pass-through capacitance 1.45..0.35pF
Capacitance between anodes 0.15pF
 
General parameters 6F1P:
Filament voltage 6.3±0.6V
Filament current 430±25mA
Total power dissipation maximum 4.5W
Weight 20g

6F1P pentode parameters:
Nominal anode voltage 170V
Anode voltage limit 250V
Anode current 10.5±3.5mA
Cathode current limit 14mA
The voltage of the first grid is nominal -2V
The voltage of the second grid is nominal 170V
The second grid voltage is limiting at a cathode current of 10/14mA 175V/200V
Second grid current 4mA
Steepness 6.2±2.2mA/V
Maximum resistance in the first grid circuit is 1.0 MΩ
Input impedance:
at 50 MHz
at 100 MHz
10Kom
2Kom
Input capacitance 5.5±1.0pF
Output capacitance 3.4±0.6pF
Pass-through capacitance 0.025pFTESTED  6F1P  (ECF80, 6BL8, 6AX8)  triode - pentode. NOS.  1971,80. 2pcs.  


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