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19H4

Sensibly equivalent to:
2T/350D CV2180
    
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The 19H4 is a high voltage half wave rectifier, it is indirectly heated and uses a 2.5 Volt heater, the original American standard for AC heated valves.
The anode has a wide diameter central tube and four side flanges for greater surface area. The blackened outer surface of the anode aids radiation efficiency.
A closer view of the anode, ceramic support and top cap connection.
Thanks to Mark Mallison for sending the images.
The wide glass tube envelope is 40 mm in diameter, and excluding the IO base pins is 115 mm tall.
Reference: Datasheet. Type 19H4 was first introduced in 1948.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
-
h
-
-
-
-
h,k
-
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.5
1.7
8,300
30.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December17, 2018.
shape:wide.glass.tube construction:pinch type:rectifier.hw age:1940.1950 base:io heater:2.5v pins:8 pin:1.- pin:2.h pin:3.- pin:4.- pin:5.- pin:6.- pin:7.h.k pin:8.- pin:tc.a
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