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UU2

 
See also:
Indirectly Heated Valves Advert - Indirectly Heated Rectifiers Advert - This Seasons Valves - The New Mains Valves
    
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The UU2 from Mazda is an indirectly heated full wave rectifier and dates to 1930.
The anodes are of a T shape with the tail anchored round a support. The heater connects at the top.
Side view.
The identification is etched into the dome. Within can be seen the shape of the anode and the heater/cathode connections.
The rectangular mica as the top insulator holding the electrodes in place.
The balloon envelope is 50 mm in diameter and, excluding the B4 base pins, is 97 mm tall.
Reference: Data. Type UU2 was first introduced in 1930. See also 1930 adverts.

 

Pin Connections
B4
1
2
3
4
a(1)
a(2)
h,k
h

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
1.0
250
60
Updated May 16, 2023.
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