6AU4

Rectifier — Octal

RCA

Known Equivalents & Substitutes

6AU4GT6AU4GTA

Similar Tubes (Not Drop-In Compatible)

Same half-wave TV damper family but 12.6V heater — not interchangeable without heater string redesign

6AX4GTB

Half-wave Octal TV damper rectifier — lower PIV (4400V vs 4500V), lower peak plate current

Electrical Specifications

Absolute Maximum

Anode Dissipation (max)Plate Dissipation (max)6.5W

Heater-to-Cathode Voltage (max)Peak Heater-Cathode Voltage (heater negative)4,500V

Rectifier

Peak Inverse VoltagePeak Inverse Plate Voltage4,500V

DC Output Current (max)DC Plate Current (max)210mA

Peak Anode Current (surge)Peak Plate Current1,300mA

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current1.8A

Notes

Pin 2 is an internal connection — do not use as a tie point.
Socket terminals 1, 2, 4, and 6 should not be used as tie points.
On the 5-pin base, pin 1 as well as pins 4 and 6 is omitted.
Peak inverse plate voltage rating of 4500V applies for operation in a 525-line, 30-frame system.
DC component of plate voltage must not exceed 900V.
DC component of heater-cathode voltage must not exceed 100V.
6AU4GT and 6AU4GTA are envelope/rating variants — pin-compatible drop-in replacements.

Pin Layout — Octal

1Internal Connection (Shell)

2Internal Connection

3Cathode

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References