The Z63 amplifier pentode was designed as a low noise audio pre-amplifier This valve was also known as the KTZ63.

The inner coating on the glass masks the electrodes. Here the connections emerging from the pinch can be seen together with heater wire and its insulation.

The Marconi brand of M-OV was usually reserved for professional valve types. Osram being the domestic brand.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 98 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	m	h	a	g2	g3	-	h	k	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	100	-2	1.0	0.25	1.5M	1.23

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 19 April 2008 {find valves by name}