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1821

Sensibly equivalent to:
CV1443 UU5
    
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The 1821 is a Philips full wave rectifier on a B4 base with a brown composition base. The UU5 is given as an equivalent but has twice the rating, so the UU5 may replace the 1821 but not the other way round.
See 1821 for internal details.
The dome of the envelope contains the etched lettering. It is unusual to see a Philips valve showing as Made in England, possibly this was made for export.
The balloon envelope is 52 mm in diameter and, excluding the B4 base pins, is 106 mm tall.
Reference: 1043. Type 1821 was first introduced in 1930.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
1.0
250
60
Updated September 14, 2013.
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