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7Z4

Sensibly equivalent to:
CV346 CV1790 EZ22 VT-181
See also:
Olympia Show 1947
    
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The 7Z4 is a full wave rectifier on a Loctal base. We also have the CV346. The UK made valves were introduced in 1947.
The twin anodes seen end on.
The anode is shaped and folded then stitched together.
The wide glass tube envelope is 29 mm in diameter, and excluding the B8B base pins is 63 mm tall.
References: Data-sheet & 1040. Type 7Z4 was first introduced in 1941. See also 1941 adverts.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
nc
a(1)
nc
nc
a(2)
k
h

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
6.3
0.9
450
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 04, 2022.
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