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35E

Sensibly equivalent to:
235 UY35 VT-35
    
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The Type 35 is a variable-μ RF tetrode, it is believed that the 35E is a variant of this. The 2.5 Volt heater was the standard for American AC valves until the 6.3 Volt standard emerged in the mid 1930's.
The construction looks much the same as the 51, which is equivalent to the Type 35.
The outer screen. On the glass is the Type 35E.
The base pins.
Thanks to Mark Mallison for sending the images.
The classic envelope is  mm in diameter and, excluding the UY base pins, is  mm tall.
Reference: Type 35 datasheet. Type 35E was first introduced in 1931.

 

Pin Connections
UY
1
2
3
4
5
tc
h
a
g2
k
h
g1

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.5
1.75
250
90
-3.0
6.5
2.5
0.4M
1.05
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2019.
shape:classic construction:pinch type:tetrode age:1930.1940 base:uy heater:2.5v pins:4 pin:1.h pin:2.a pin:3.g2 pin:4.k pin:5.h pin:tc.g1
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