Same Octal pinout but approximately double the mu (5.4 vs 2.0) and gm (15.5 vs 7.0 mA/V) — changes bias points, not a drop-in
6336
Successor design with higher ratings (Va_max 400V, Pa_max 30W) — not a drop-in due to different maximum ratings and potential for over-dissipation in 6080 circuits
6533
RCA lists as similar — higher-current variant, not a drop-in
7105
RCA lists as similar — verify ratings before substituting
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)125mA
Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max)300V
Notes
Automatic (cathode) bias is recommended by Philips. With fixed bias, the anode circuit must contain a protective resistance to provide a minimum voltage drop of 15V DC under normal operating conditions.
When two or more sections are paralleled at dissipations approaching rated maximum, separate anode and cathode resistors must be used to advance load sharing.
Grid circuit resistance limit differs by bias method: 1.0 MΩ for cathode bias, 0.1 MΩ for fixed bias (Philips datasheet).
The Philips datasheet specifies two typical operating points: Va=100V with Rk=300Ω (Ia=100mA, gm=6.5 mA/V, ra=300Ω) and Vba=135V with Rk=250Ω (Ia=125mA, gm=7.0 mA/V, ra=280Ω). The second is the regulator test condition at absolute limits of Ia and Wa.
6N13S (6Н13С) is the Soviet equivalent; electrically compatible but may have slightly different capacitance values.
Registered December 4, 1951 (Electron Tube Registration List 1039). The 6080 was intended as an improved, ruggedized version of the 6AS7G with tighter parameter tolerances for military and industrial voltage regulator service.
Pin Layout — Octal
1Grid (triode 2)
2Anode (triode 2)
3Cathode (triode 2)
4
Socket-Compatible Tubes ⚠ Not electrically compatible