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 beam tetrode, 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.

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

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(t)	g1(t)	k,s	h	h	a	g3	g2	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	170	170	-6.7	15.0	2.8	150k	3.2

Triode	Va	Vg	mAa	ra	gm
	100	-2.3	4.0	12,500k	1.4

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 04 July 2009