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The 6AU4GTA is a half wave rectifier designed for American TV receivers. The design purpose is as a damper diode with a conduction time of no more than 15% of the line cycle. In European terminology this is an efficiency diode.

The anode dissipation is 6 W.

The 19AU4GTA is identical but has a 600 mA heater for series connection. The 6AU4GT is basically similar but with a reduced current rating.

In this image the helical insulator that adds additional separation between the heater and cathode can be seen.

Thanks to Mark Mallison for sending the images.

The wide glass tube envelope is  mm in diameter, and excluding the IO base pins is  mm tall.

Reference: Data-sheet. Type 6AU4GTA was first introduced in 1955. See also 1955 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.