The Cossor 6BX6 is equivalent to the Mullard EF80. It is an internally screened pentode and was a workhorse of the VHF TV receiver. The type was introduced in 1950. Much used for RF, intermediate frequency, and video amplification in 405 line television receivers.

The circuit designer is given maximum flexibility by having all electrodes brought to external pins. Many pentodes have g3, the suppressor grid, internally connected to the cathode.

The thin glass tube envelope is 20 mm diameter and excluding the B9A base pins stands 60 mm high.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.7	0.3	170	170	-2	10	2.5	0.4M	7.4

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 11 November 2008 {find valves by name}