Russian equivalent of 6SL7GT. Same Octal pinout but same electrical differences as 6SL7GT vs ECC35 (heater current 0.3A vs 0.4A, mu 70 vs 68).
6SL7GT
Electrically similar but different heater current (0.3A vs 0.4A), mu (70 vs 68), and ra (44k vs 34k ohms) — not a drop-in in heater-current-limited designs
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)300V
Anode Dissipation (max)Anode Dissipation (max, per section)1.5W
Cathode Current (max)Cathode Current (max)8mA
Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)90V
Max Grid ResistorMax Grid Resistor
Notes
Heater current is 0.4 A — higher than the 6SL7GT (0.3 A). Not a drop-in replacement in heater-current-limited designs.
Mullard ECC35 has mu of 68 and ra of 34 kΩ at Va=250V, Vg=-2.5V. The American 6SL7GT is rated mu=70, ra=44 kΩ at Va=250V, Vg=-2V. Electrically similar but not identical.
Va(b) max of 550 V is the maximum anode voltage at zero anode current (no-signal or blocked condition), not the operating maximum.
Pin Layout — Octal
1Control Grid (section 2)
2Anode (section 2)
3Cathode (section 2)
4
Socket-Compatible Tubes ⚠ Not electrically compatible