6BX7

Power Triode — Octal

General Electric

Known Equivalents & Substitutes

6BX7GT

Similar Tubes (Not Drop-In Compatible)

6BL7GT

Similar pinout but different mu (15 vs 10) and ra (2150 vs 1300 ohms) — substitution may require circuit adjustment

6BL7GTA

Revised 6BL7 with same differences — mu 15 vs 10, higher ra

Similar application but different characteristics — not a direct drop-in replacement

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)500V

Anode Dissipation (max)Anode Dissipation (max, per section)10W

Cathode Current (max)Cathode Current (max, average)60mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max, negative)200V

Max Grid ResistorMax Grid Circuit Resistance (self-bias)

Notes

Maximum plate dissipation is 10 W per section, 12 W total for both sections combined.
When operated as a combined vertical deflection amplifier and oscillator, it is recommended that section 1 (pins 4, 5, and 6) be used as the oscillator.
In stages operating with grid leak bias, an adequate cathode bias resistor or other suitable means is required to protect the tube in the absence of excitation.
The 6BL7GT is a near-equivalent with similar pinout but slightly different characteristics (mu=5.6 vs mu=10); substitution may require circuit adjustment.

Pin Layout — Octal