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ARP35

Sensibly equivalent to:
63SPT CV1091 CV1578 EF50 VR91 Z90
See also:
The Famous EF50 of WWII - Inside the EF50
    
Extras ▼

 

The ARP35 is the UK Army, pre-WWII, name for the EF50.
Valves supplied to the services are usually left in plain aluminium cans without the maker's name. This exhibit is clearly a Mullard EF50 with ARP35 printed in place of the commercial designation.
The valve is a high impedance variable μ pentode and was a workhorse of receivers for TV, radio and especially war-time radar.
The reverse is unmarked.
The wide glass tube envelope is 33 mm in diameter and, excluding the B9G base pins, is 58 mm tall.
References: Data-sheet & 1043. Type ARP35 was first introduced in 1938.

 

Pin Connections
B9G
1
2
3
4
5
6
7
8
9
h
g2
a
g3
s
k
g1
s
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
250
-2
10
3
1M
6.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 14, 2021.
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