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KT24

Sensibly equivalent to:
ARP18 BY3 CV1334 PB2 PP220 PT240 VT51
    
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The KT24 was issued as a replacement for the KT21 output valve. The KT21 had a steep slope (gm=5.3 mA/V) (KT21 data-sheet attached).
We believe that like the KT2 it is 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.
With an anode load of 10,000 Ohms, a single valve would produce 650 mW output from battery supplies.
The Osram label.
The top mica: two filament tension springs can be seen but not the grids.
The classic envelope is 44 mm in diameter and, excluding the B5 base pins, is 90 mm tall.
References: Datasheet & 1043. Type KT24 was first introduced in 1939.

 

Pin Connections
B5
1
2
3
4
5
a
g1
f(-),g3
f(+)
g2

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
2.0
0.2
150
150
-2.8
10.0
2.1
3.2
0.65
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 28, 2014.
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