▼ Menu

DW2

Sensibly equivalent to:
1821 500BU CV1443 R1 UU5
    
Extras ▼

 

The DW2 is a directly heated device with the original UK standard 4 Volt 1 amp heater requirement for AC valves.
The DW2 is rated to work with no more than a 16 μF reservoir capacitor.
The pair of anode towers.
The base of one anode showing the oxide coated ribbon filament.
Above the top mica are the filament tension springs. The oxide coating of the ribbon is clearly seen.
The classic envelope is 45 ;mm in diameter and, excluding the B4 base pins, is 103 mm tall.
References: 1931 datasheet. Type DW2 was first introduced in 1930.

 

Pin Connections
B4
1
2
3
4
a
a
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4
1.0
250
60
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated January 15, 2015.
Return to Main Index