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UY85

Sensibly equivalent to:
38A3 U119 U381
    
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The UY85 is a half wave rectifier and would be used on small universal (AC/DC) mains appliances. The heater chain would draw 100 mA and this was to enable the small number of valves used in a broadcast radio receiver to be run without a large dropper (ballast) resister.
The UY85 can work into a maximum reservoir capacitance of 100 µF, as protection a series resistance of 100 Ohms minimum is required.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 57 mm tall.
References: Datasheet & 1040. Type UY85 was first introduced in 1954.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
-
-
k
h
h
-
-
-
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
38
0.1
250
110
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 02, 2015.
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