The KT2 is a 'critical-distance' tetrode, based on the Harries patent. This type of tetrode requires a large anode diameter and is efficient only in relatively low-power applications. The famous kinkless tetrodes (KT66 etc.) are aligned-grid beam tetrodes with smaller anode spacings but capable of very substantial power outputs for their size.

The KT2 was in neither a beam tetrode nor a member of the KT66 family, except in name. The KT24 is essentially a beefier (and greedier) version of the KT2. The KT2 was introduced as a replacement for the PT2.

With an anode load of 17,000 Ohms, this valve would produce 0.5 Watts from battery supplies.

The classic envelope is 42 mm in diameter and, excluding the B5 base pins, is 90 mm tall.

 
Pin Connections

B5	1	2	3	4	5
	a	g1	f(-)	f(+)	g2

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm	Pout
	2.0	0.2	150	150	-4.5	7.5	1.7	2.5	0.5

This exhibit was last updated on 28 October 2006