6J9P

Small Signal Pentode — Noval

Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

↗ Radiomuseum

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

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

Socket-Compatible Tubes ⚠ Not electrically compatible

12B4A 19BY7 6J11P AL860

References

https://www.radiomuseum.org/tubes/tube_6j9p.html