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KT2

Sensibly equivalent to:
220HPT 220OT ARP1 CV1118 NR39 PM22A PP2 PT2 Pen220 PenB1 VR118
See also:
Marconi KT2 Advert - Marconi KT2 Box - CV1118 short entry
    
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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, a single 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.
References: Datasheet & 1040. Type KT2 was first introduced in 1937.

 

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
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 04, 2015.
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