6AH4

Power Triode — Octal

Tung-Sol

Known Equivalents & Substitutes

6AH4GT

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Max Plate Voltage500V

Peak Anode Voltage (max)Max Peak Positive Plate Voltage2,000V

Anode Dissipation (max)Max Plate Dissipation7.5W

Cathode Current (max)Max Average Cathode Current60mA

Heater-to-Cathode Voltage (max)Max Heater-Cathode Voltage (DC and peak)200V

Max Grid ResistorMax Grid Circuit Resistance2.2MΩ

Typical Operating

Anode Voltage (typical)Plate Voltage250V

Grid 1 Bias VoltageGrid Voltage-23V

Anode CurrentPlate Current30mA

Anode ResistancePlate Resistance1,780Ω

TransconductanceTransconductance

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance4.4pF

Grid-to-Cathode CapacitanceInput Capacitance (Grid to Heater+Cathode)7pF

Anode-to-Cathode CapacitanceOutput Capacitance (Plate to Heater+Cathode)1.7pF

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.75A

Notes

Tung-Sol datasheet (1952, tentative data): Two operating points given — Va=250V/Vg=-23V/Ia=30mA and Va=250V/Vg=-33V/Ia=5mA. Typical characteristics at 30mA point: gm=4500 µmhos, mu=8, ra=1780Ω.
Maximum ratings per RMA Standard MS-210 for vertical deflection amplifier service (525-line, 30-frame TV system).
Maximum peak positive plate voltage of 2000V; voltage pulse must not exceed 15% of one scanning cycle.
Maximum grid circuit resistance 2.2 MΩ; adequate bias resistor required to protect tube when excitation is absent.
MIL-HDBK-213A lists as 6AH4GT, class: receiving triode.
Muiderkring handbook lists on page 138, type classification: triode.
Grid voltage for 0.5mA plate current (approx.) is -40V.

Pin Layout — Octal

1No Connection

2Heater

3Plate

4

References