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705A

Sensibly equivalent to:
2J/40E 2T/450E A232 CV3587 CV8238 TH705A
    
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The 705A is an EHT power rectifier with a PIV rating of 35,000 Volts. The average rectified current is 100 mA with a peak of 500 mA. The construction is all glass with the lead-out wires being fixed to the main pins that are held in a ceramic disc outside the envelope. The special base clamps to this ceramic disc.
The filament is thoriated tungsten and when powered glows a bright orange.
See 705A from Western Electric for more details. This exhibit shows a different style of lettering.
The wide glass tube envelope is 58 mm in diameter, and excluding the B4A base pins is 117 mm tall.
References: Datasheet & 1040. Type 705A was first introduced in 1943.

 

Pin Connections
B4A
1
2
3
4
tc
f
fct
f
-
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
5.0
5.0
12.000
500
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 27, 2013.
shape:wide.glass.tube construction:all.glass type:rectifier.hw age:1940.1950 base:b4a heater:5.0v pins:4 pin:1.f pin:2.fct pin:3.f pin:4.- pin:tc.a
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