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1807

Sensibly equivalent to:
442BU DW30 DW3 R3 U12 UU120/350
    
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The 1807 is a directly heated full wave rectifier dating from the early 1930s. The construction follows what became the standard pattern of anode shape and ribbon filament. Our other 1807 looks to be of an earlier construction.
The glass rod insulators that hold the filament tension springs and the inverted V of the oxide coated filament ribbon.
The pinch and lower supports.
The identification is confined to the dome.
The balloon envelope is 54 mm in diameter, and excluding the B4 base pins is 119 mm tall.
Reference: Datasheet. Type 1807 was first introduced in 1932.

 

Pin Connections
B4
1
2
3
4
a(1)
a(2)
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0V
2.0
350
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 17, 2019.
shape:balloon construction:pinch type:rectifier.fw age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.a(1) pin:2.a(2) pin:3.f pin:4.f
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