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VT-223

Sensibly equivalent to:
1H5GT CV1820 DAC32
    
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The 1H5GT is a dry battery diode triode for receiver use. The 1LH4 is the same valve but on a B8B base. In a TRF receiver the diode would provide AM signal demodulation and the high μ triode would be the first audio voltage amplifier.
The Triode at the top and below the central mica sheet is the screen that conceals the rod that acts as the diode anode.
A closer view: the filament tension spring can be seen at the top.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 68 mm tall.
References: Datasheet, 1040 & 1043. Type VT-223 was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
-
f
a
-
a(d)
-
f
-
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
1.4
0.05
90
0
0.15
0.24M
0.275
65
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December19, 2018.
shape:wide.glass.tube construction:pinch type:diode.triode age:1940.1950 base:io heater:1.4v pins:8 pin:1.- pin:2.f pin:3.a pin:4.- pin:5.a(d) pin:6.- pin:7.f pin:8.- pin:tc.g1
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