6AS7

Power Triode — Octal

RCA

Known Equivalents & Substitutes

6AS7G6AS7GA60806080WA6080WB65206N13S6N13P 6H13CCV2523CV2984CV10322CK6080E6080ECC230A1834A4475EI834RK60807802

Similar Tubes (Not Drop-In Compatible)

Same Octal pinout but ~double the mu (5.4 vs 2.0) and gm (15.5 vs 7.0 mA/V) — changes bias points, not a drop-in

6533

RCA lists as similar to 6080/6AS7 — higher-current variant, not a drop-in

7105

RCA lists as similar to 6080/6AS7 — verify ratings before substituting

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)275V

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

Cathode Current (max)Cathode Current (max, per plate)125mA

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

Notes

When multiple tube sections are paralleled for higher current, it is recommended not to exceed 100 mA per plate (Tung-Sol).
Grid circuit resistance limit differs by bias method: 1.0 MΩ for cathode bias, 0.1 MΩ for fixed bias or combination (Tung-Sol).
6080 is the industrial/ruggedized version with tighter parameter tolerances but identical ratings and pinout.
6N13S (6Н13С) is the Soviet equivalent; electrically compatible but may have slightly different capacitance values.
The typical operating point in the Tung-Sol datasheet (Va=135 V, Rk=250 Ω) is for voltage regulator service. Audio use typically runs at higher Va (up to 250 V) as shown in the Svetlana datasheet.
Svetlana rates Pa_max at 13 W per plate vs Tung-Sol's 14 W — use the more conservative 13 W rating for design margin.

Pin Layout — Octal

1Grid (triode 2)

2Anode (triode 2)

3Cathode (triode 2)

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References