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VT-24

Sensibly equivalent to:
864
    
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The VT-24 is the American Government procurement code for the commercial 864 general purpose triode. Both Type designations appear on the valve.
The bright anode and single inverted V filament.
The original box shows that this was made for the U S Army Signals Corps.
Thanks to Mark Mallison for sending the images.
The wide glass tube envelope is  mm in diameter and, excluding the UX4 base pins, is  mm tall.
References: Data-sheet & Data.

 

Pin Connections
UX4
1
2
3
4
f(+)
a
g1
f(-)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
1.1
0.25
90
-4.5
2.9
13.5
0.61
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 07, 2025.
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