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85A1

Sensibly equivalent to:
CV431
See also:
85A1 Advert, December 1948 - Stabilized Power Supplies
    
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The 85A1 voltage stabiliser, from 1948, will strike at 125 volts and is useful for output currents of between 1 - 8 mA. The preferred operating point is 4.5 plus or minus 0.2 mA this indicates a design for a reference tube and not a direct stabiliser.
The envelope is opaque from all angles. The additional codes are date and location codes.
The base is a standard B8B but is unusual in that only three pins are present. I suspect that in practice this valve would have been held in place with a retaining clamp.
The wide glass tube envelope is 27 mm in diameter and, excluding the B8B base pins, is 62 mm tall.
References: Datasheet & 1040. Type 85A1 was first introduced in 1948.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
-
a
-
k
-
-
-
k

 

Absolute Maximum Operating Conditions
Stabiliser
Va
mAa
65
8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 31, 2013.
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