Russian designation is 6Ж32П (6Zh32P). The Latin transliteration 6J32P is used internationally.
Pins 1 and 7 are internal metallic shields — must be grounded for lowest noise performance, identical to EF86 shielding arrangement.
Russian spec gives gm = 1.8 ± 0.5 mA/V vs Western EF86 spec of 2.0 mA/V; this reflects wider Soviet production tolerances rather than a design difference.
Rg_max = 3 MΩ per Russian datasheet (applies at all operating points), vs EF86 which allows 10 MΩ at Pa < 0.2 W.
Svetlana EF86 datasheet specifies cathode bias resistor of 1 kΩ (pentode) or 3.9 kΩ (triode); some Russian sources cite 1.5 kΩ for pentode — verify against specific circuit requirements.
Triode-strapped data from Svetlana EF86 datasheet (manufacturer data): Va=250V, Rk=3.9kΩ, Ia=0.65mA, ra≈65kΩ, rl=220kΩ. Schlangen measured values for EF86 (μ=33, gm=2.0, rp=16.5kΩ) represent a different operating point.
EF806S is a selected low-noise variant with tighter tolerances — not identical but pin-compatible.
Pin Layout — Noval
1Screen Grid
2Internal Shield
3Cathode
Socket-Compatible Tubes ⚠ Not electrically compatible