6N5S

Power Triode — Octal

Svetlana

Known Equivalents & Substitutes

6AS76AS7G6AS7GA60806080WA6080WB65206N13S6H13CCV2523CV2984CV10322CK6080E6080ECC230A1834A4475EI834RK6080

Similar Tubes (Not Drop-In Compatible)

Same Octal pinout but approximately double the mu (5.4 vs 2.5) and gm (15.5 vs 5.5 mA/V) — changes bias points, not a drop-in

Noval (9-pin) base variant of similar design — not pin-compatible with Octal 6N5S

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)250V

Anode Dissipation (max)Anode Dissipation (max, per plate)13W

Cathode Current (max)Cathode Current (max, per section)130mA

Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max)300V

Notes

Also written as 6Н5С in Cyrillic. The Latin transliteration 6H5C is used interchangeably in Western markets.
The 6N5S is an earlier Soviet production variant in the same family as the 6N13S (6Н13С). Commercial sources and multiple vendors confirm them as interchangeable equivalents with identical pinout and nearly identical specifications.
Soviet datasheet specifies typical parameters at Va=90V, Vg=-30V: Ia=80mA, gm=5.5 mA/V, ra≤460 Ω per triode. The Western 6AS7G (Tung-Sol) specifies mu=2.0 and gm=7.0 mA/V at different operating conditions (Va=135V, Rk=250Ω).
Maximum ratings per triode: Va=250V, Pa=13W, Ik=130mA. Grid circuit resistance must not exceed 1 MΩ.
Works in any mounting position. Minimum rated service life: 2000 hours.

Pin Layout — Octal

1Grid (triode 2)

2Anode (triode 2)

3Cathode (triode 2)

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References