Similar twin triode but different mu (32 vs 35), higher heater current (0.95A vs 0.8A)
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)300V
Anode Dissipation (max)Anode Dissipation (max, Class B per plate)5.5W
Cathode Current (max)Peak Plate Current (max, per plate)125mA
Max Grid ResistorMax Grid Resistor (cathode bias)0.5MΩ
Typical Operating
Notes
Common cathode — both triode sections share pin 8. Individual cathode biasing per section is not possible.
Class A1 Pa_max is only 1.0 W per plate; Class B Pa_max is 5.5 W per plate. The tube is primarily intended for Class B push-pull service.
Rg_max is 0.5 MΩ with cathode bias, but only 0.1 MΩ with fixed bias.
Two 6N7s (or 6N7Gs) can be paralleled in Class B (4 triode units total) for approximately 20 W output at 300 V on a 5000 Ω plate-to-plate load.
6N7 has a metal shell envelope; 6N7GT/G has a T-9 glass envelope with intermediate shell and octal base. Electrically identical.
Predecessor type 6A6 has the same electrical characteristics but uses a different base (UX6, 6-pin).
ECC31 (Mullard) is similar but has different characteristics: higher heater current (0.95A), lower mu (32), and higher ra (14 kΩ). Not a drop-in replacement in critical applications.
Pin Layout — Octal
1Shell (6N7) / No Connection (6N7GT/G)
2Heater
3Anode 2
4
Socket-Compatible Tubes ⚠ Not electrically compatible