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The 6AB8 is a triode plus output pentode primarily designed for use in television receivers (VHF 405 line models) with the triode as a frame blocking oscillator and the pentode as a frame output valve. Other applications include the use of the triode as a line blocking oscillator, AF voltage amplifier or in multivibrator circuits and the operation of the pentode as an audio output valve or a synchronising pulse separator.

The lower electrode structure is the pentode and the three wire grids can be seen through the side holes in the anode. The triode is the small structure at the top of the valve. The triode grid is set at 90 degrees to the pentode grids. The heater at 6.3 Volts and 300 mA makes this valve suitable for equipment with mains transformers and also heater chains across the domestic mains.

The vertical copper rod is the triode anode connection.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 6AB8 was first introduced in 1950. See also 1950 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.