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DY87

Sensibly equivalent to:
152A 1S2 1S2A DY86
See also:
Valves and their Habits
    
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The DY87 is a television EHT rectifier introduced in 1956. It was designed to have its heater supply produced by an overwind on the line output transformer. The 18,000 Volt rating places this as a rectifier for medium sized monochrome televisions.
This generic version has no maker's name but has unusually clear glass.
Electrically the DY87 is identical to the DY86. The DY87 has the glass treated with silicone to improve insulation in humid environments.
The heater is made of stranded wire and is fixed to the two rods.
The coated cathode tube is located at the centre of the bell anode with significant space around it.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 66 mm tall.
References: Datasheet & 1040. Type DY87 was first introduced in 1955.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
tc
h,k,s
h
ic
h,k,s
h
h,k,s
ic
h
h,k,s
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
1.4
0.55
18,000
0.15
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December20, 2017.
shape:thin.glass.tube construction:all.glass type:rectifier.hw age:1950.1960 base:b9a heater:1.4v pins:9 pin:1.h.k.s pin:2.h pin:3.ic pin:4.h.k.s pin:5.h pin:6.h.k.s pin:7.ic pin:8.h pin:9.h.k.s pin:tc.a
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