Output pentode TESLA EL84 = 7189=6BQ5. PCS1.
Marking missing!
Uh=6,3V, Ua=250V, Ug2=250V, Rk=120Ohm
№3       Ia=48mA, S=9,4mA/V, Ig2=4,1mA
№8       Ia=45mA, S=10,8mA/V, Ig2=5,5mA

Designed for power amplification of low frequency. 
Weight not more than 20 g.

Main technical characteristics :
Filament voltage ...... 6,3 ± 0,6 V
Filament current ...... 760 ± 60 mA
The anode voltage nominal (DC) ...... 250V
The voltage of the anode limit ...... 300 V
The anode current ...... 48 ± 8 mA
The cathode current limiting ...... 65 mA
The second grid voltage nominal (DC) ...... 250V
The second grid voltage limit (DC) ...... 300 V
Current of second grid  no more than 7 mA
The power dissipated by the anode limit ...... 14 W
The power dissipated by the second grid,  limit ...... 2 W
The voltage between cathode and heater limit (DC) ...... 100V
The steepness of the characteristics ...... 11,3 mA/V
The amplification factor in a triode inclusion ...... about 20
Internal resistance of 30 ohms
Resistance in the cathode circuit to automatically bias ...... 120 Ohm
Capacity input ...... about 11 pF
Capacity output ...... about 7 pF
Capacity checkpoint ...... about 0.2 pF

Condition.

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