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 triode is perched on the tip of the pentode and shares the central cathode. The other plates above the prntode are radiator strips for the grids.

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

More

This exhibit was last updated on 04 July 2009