ECC81 - 6N1P


S Ri Ra Pa Pout
3.2 11 - 2 -



General characteristics

6N1P is used to amplify tensions in audio frequency range. 6N1P is commonly used as preamplifier.
Cathode: indirectly heated, oxide-coated.
Operating position: any.
Nine pin base. Standart noval socket.


Capacitance between electrodes in pF

On grid for each triode: 3,8.
On plate for each triode: 1,75.
Grid to plate for each triode: 1,85.
Between anodes: 0,05.


Nominal Electrical characteristics (for each triode)

Heater Voltage, V 6.3
Anode Voltage, V 250
Resistance in cathode circuit for self-biasing, Ohm 600
Heater Current, mA 600+-50
Anode Current, mA 8+-2.4
Transconductance, mA/V 3.2
Transconductance when heater voltage = 5.7 V, mA/V 2.7 mini
Plate resistance, kOhm 11
Amplification coefficient 35+-7

Maximum ratings (for each triode)

Maximum heater voltage, V 7.0
Minimum heater voltage, V 5.7
Maximum anode voltage, V 300
Maximum anode dissipation, W 2.0
Maximum cathode to heater during potential, V 250
Maximum cathode current, mA 25
Maximum leak current between cathode and heater, µA 30
Minimum resistance in cathode circuit for self-biasing, Ohm 600
Maximum resistance on control grid, MOhm. 0.5

  6N1P is an analogue of 6N8C. The two tubes are interchangeable and are used in the same diagrams.

Typical Characteristics

Anode and grid currents versus anode potential.

anode current; grid current; maximum anode dissipation.


Anode current versus grid potential and load resistance with voltage supply at anode = 250V.


thanks to The Encyclopedia of Tube Electronics