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85

Sensibly equivalent to:
CV2549
    
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The 85 triode valve would be used in radio reception equipment. The diodes are for signal use and probably would be for AGC and AM signal detection. The triode would act as AGC amplifier or first audio amplifier, probably the latter.
The same characteristics and heater but with an IO base are found in 6V7G. The same characteristics but with a 2.5 V heater are found in Type 55.
The cathode tube runs vertically through both parts of the valve. The lower box forms the two diodes, each side being an independent anode. The upper black anode is formed with a cylindrical cavity that houses the cathode and grid.
The classic envelope is 35 mm in diameter and, excluding the UX6 base pins, is 97 mm tall.
References: Datasheet, 1040 & 1043. Type 85 was first introduced in 1936.

 

Pin Connections
UX6
1
2
3
4
5
6
tc
h
a
a(d2)
a(d1)
k
h
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-20
8
7.5k
1.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 08, 2013.
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