Very close electrically (mu≈98 vs 100) but NOT pin-compatible: 6N2P heaters are internally parallel on pins 4/5 (no series-heater option, no pin 9 heater center tap), and 6N2P pin 9 is an electrostatic screen between the two triodes. Requires rewiring or an adapter.
Ruggedized high-mu twin triode (mu=70) on standard 12AX7 Noval pinout; 6N2P has higher mu (≈98) but different pinout (shield on pin 9, parallel heaters only).
Soviet twin triode on same Noval base, but medium-mu (mu≈35) voltage amplifier with much lower ra — different gain class.
ECC83
Same high-mu twin-triode electricals as ECC83 (mu≈98) but different Noval pinout — 6N2P has pin 9 as electrostatic screen and parallel-only heaters on pins 4/5.
NOT a drop-in replacement for ECC83/12AX7 despite similar electricals. The two heater elements are internally connected in parallel on pins 4 and 5, so only 6.3 V operation is possible (no 12.6 V series option). Pin 9 is an internal electrostatic screen between the two triodes, NOT a heater center tap as on 12AX7 — it is typically grounded.
Retrofitting a 12AX7 circuit for 6N2P requires rewiring the heater wiring and grounding pin 9.
Datasheet gain coefficient is specified as 97.5 ± 17.5 (6N2P) / 100 ± 15 (6N2P-EV). Internal plate resistance (ra) is not explicitly tabulated on the Russian datasheet; the value ≈43 kΩ is derived from the nominal mu/gm (97.5 / 2.25 mA·V⁻¹) and is consistent with published Russian handbook values.
Characterised at Va=250 V, Vg=−1.5 V, Vh=6.3 V. Operating period rated ≥5000 h for both standard and -EV grades.
Pin Layout — Noval
1Anode 2 (Triode section 2)
2Control Grid 2 (Triode section 2)
3
Socket-Compatible Tubes ⚠ Not electrically compatible