12J5GT

Small Signal Triode — Octal

Known Equivalents & Substitutes

12J5CV534CV535VT135VT135A12J5WGT

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Max Plate Voltage300V

Anode Dissipation (max)Plate Dissipation (max)2.5W

Cathode Current (max)Total Cathode Current (max)20mA

Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max)90V

Max Grid ResistorMax Grid Resistor1MΩ

Typical Operating

Anode Voltage (typical)Plate Voltage250V

Grid 1 Bias VoltageGrid Bias Voltage-8V

Anode CurrentPlate Current9mA

Anode ResistancePlate Resistance7,700Ω

TransconductanceTransconductance

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance3.4pF

Input CapacitanceInput Capacitance3.4pF

Output CapacitanceOutput Capacitance3.6pF

Heater

Heater VoltageHeater Voltage12.6V

Heater CurrentHeater Current0.15A

Notes

Electrically identical to the 6J5/6J5GT except for heater voltage (12.6V vs 6.3V).
Heater-cathode voltage should be kept to a minimum if direct connection is not possible (GE datasheet). Max Vhk = 90V DC.
Pin 1 (shell) should be connected to cathode per GE datasheet.
The d-c resistance in the grid circuit under maximum rated conditions should not exceed 1.0 megohm.

Pin Layout — Octal

1Shell

2Heater

3Plate

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References