12J5

Small Signal Triode — Octal

GE

Known Equivalents & Substitutes

12J5GTCV534CV535VT-135VT-135A

Similar Tubes (Not Drop-In Compatible)

Similar medium-mu triode but different pinout and capacitances

Electrically identical 6.3V heater version — same mu, ra, gm, and pinout but different heater voltage (6.3V vs 12.6V)

Electrically identical loctal-base equivalent — not pin-compatible with octal 12J5

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Max. Plate Voltage300V

Anode Dissipation (max)Max. Plate Dissipation2.5W

Cathode Current (max)Max. Cathode Current20mA

Heater-to-Cathode Voltage (max)Max. Heater-Cathode Voltage90V

Max Grid Resistor

Notes

Electrically identical to the 6J5 except for 12.6V/0.15A heater (vs 6.3V/0.3A). Identical to one section of the 6SN7 twin triode.
Pin 1 is the metal shell (internal shield) connection; it should be grounded (connected to cathode per GE datasheet).
The d-c resistance in the grid circuit under maximum rated conditions should not exceed 1.0 megohm.
Base designation 6Q (Octal 6-pin, RMA 8-1). MT-8 metal shell envelope, small wafer Octal 8-pin base.

Pin Layout — Octal

1Metal Shell (Internal Shield)

2Heater

3Plate

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References