Russian equivalent of 6SN7GT. Same Octal pinout but same electrical differences as 6SN7GT vs ECC32 (mu=20 vs 32, lower ra, lower heater current 0.6A vs 0.95A).
6SN7GT
Same octal pinout but different electrical characteristics: ECC32 has mu=32, ra=14 kOhm, Ih=0.95A vs 6SN7GT mu=20, ra=7.7 kOhm, Ih=0.6A. Higher heater current requires verification of heater supply capacity.
VT-231
Military designation of 6SN7GT. Same pinout but different electrical characteristics (mu=20 vs ECC32 mu=32, different heater current).
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)300V
Anode Dissipation (max)Anode Dissipation (max)5W
Cathode Current (max)Cathode Current (max)50mA
Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)50V
Max Grid Resistor
Notes
The ECC32 draws 0.95 A heater current versus 0.6 A for the 6SN7GT. Circuits designed for 6SN7 may not have sufficient heater supply headroom for an ECC32 substitution.
Va max is only 300 V compared to 450 V for the 6SN7GT. The ECC32 cannot be used in high-voltage 6SN7 circuits without verifying plate voltage stays within limits.
The ECC32 was the driver tube specified for the original Williamson 50-watt amplifier (1947), one of the first high-fidelity amplifier designs. First marketed by Mullard in late 1939.
The Rh-k max (heater-to-cathode resistance) of 20,000 ohms means the heater-cathode insulation should not exceed this value; relevant for elevated cathode voltage applications.
Pin Layout — Octal
1Control Grid (section 2)
2Anode (section 2)
3Cathode (section 2)
4
Socket-Compatible Tubes ⚠ Not electrically compatible