▼ Menu

1807

Sensibly equivalent to:
442BU DW30 DW3 R3 U12 UU120/350
    
Extras ▼

 

The 1807 rectifier is a directly heated device from the early 1930s. The construction looks very similar to the Mullard DW3 & DW30, the DW30 is rated for 500 Volts.
The filament supports are held in glass rods.
The identification is etched into the top of the envelope.
Thanks to Mike Edwards for the pictures and information that this valve came from a 1932 Kolster Brandes KB321 wireless set.
The balloon envelope is  mm in diameter, and excluding the B4 base pins is  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 February 20, 2013.
Return to Main Index