6J9P

Small Signal Pentode — Noval

Known Equivalents & Substitutes

E180F66886676

Similar Tubes (Not Drop-In Compatible)

6AH6

Western sharp-cutoff pentode with high gm — similar application but lower transconductance (~9000 vs ~25000 µmhos)

6J11P

Soviet E280F equivalent — even higher gm than 6J9P

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)330V

Screen Voltage (max)Screen Voltage (max)150V

Anode Dissipation (max)Anode Dissipation (max)3.5W

Screen Dissipation (max)Screen Dissipation (max)1W

Typical Operating

Anode Voltage (typical)Anode Voltage200V

Screen Voltage (typical)Screen Voltage120V

Grid 1 Bias VoltageGrid 1 Bias Voltage-1.5V

Anode CurrentAnode Current25mA

Screen CurrentScreen Current

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance0.005pF

Input CapacitanceInput Capacitance12pF

Output CapacitanceOutput Capacitance4.5pF

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.4A

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)330V

Screen Voltage (max)Screen Voltage (max)150V

Anode Dissipation (max)

Notes

Cyrillic designation: 6Ж9П. Russian_equivalents.json confirms: 6J9P ≈ E180F, 6688.
Frame-grid construction gives very high transconductance (~25 mA/V at typical operating point), making it one of the highest-gm small-signal pentodes available.
The E180F/6688 is a Philips/Amperex design widely used in professional audio and instrumentation. The Soviet 6J9P is the direct copy.
Used extensively in Soviet oscilloscope vertical amplifiers and wide-band IF stages.
Can be triode-strapped for audio applications — provides very high transconductance as a triode.

Pin Layout — Noval

1Grid 3 (Suppressor)

2Anode

3Cathode

References