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MU14

Sensibly equivalent to:
1867 AU4A CV1039 IW4 NU17 R3 UU120/350 UU120/500 UU5 UU60/250 VU39
See also:
Domestic Rectifiers
    
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M-OV's first indirectly-heated HT rectifiers were the MU12 and MU14. These were in fact the same valve but only a minority of each production batch were good enough to withstand the full rating when tested. These few were labeled MU14 but the 'also-rans' (initially the large majority) were labeled MU12 and sold against a reduced specification (350 V).
The Marconi paper label.
Face view of one anode.
The classic envelope is 45 mm in diameter and, excluding the B4 base pins, is 102 mm tall.
References: Datasheet. Type MU14 was first introduced in 1933.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.5
500
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 23, 2018.
shape:classic 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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