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The 6AB8 is a triode, 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, the triode is the small structure at the top of the valve. The heater at 6.3 Volts and 300 mA makes this valve suitable for equipment with mains transformers and heater chains across the domestic mains. This dual use given in the data-sheet implies a tight control of the heater construction. In other cases the 0.3 A consumption is nominal and this would result in incorrect operation if a valve designed to be heated from a constant voltage were to be driven by a constant current.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 59 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.