The PCL83 is a television audio triode output pentode. It produces enough output power for an average domestic environment. Marconiphone is a brand name used by M-OV.

This standard design was made by several manufacturers. We also have other examples: PCL83 from Brimar & PCL83 from Mullard.

In the envelope the two electrode systems are side by side. The triode being much smaller anode. The wire grids can be seen through the hole in the pentode anode.

The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 47 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	at	gt	kt	h	h	ap	kp,g3	g2	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pdiss	Pout
	12.6	0.3	170	170	-9.5	30	5	53k	5.5	5.4W	2.2W

Triode	Va	Vg	mAa	ra	gm
	250	-8.5	10.5	7700	2.2

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 10 June 2007 {find valves by name}