DY87 @ The Valve Museum

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DY87

Sensibly equivalent^¶ to:

152A 1S2A 1S2 DY86

See also:

Valves and their Habits

Extras ▼

Tungsram The Hampshire Collection Other DY87 exhibits

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.

Electrically the DY87 is identical to the DY86. The DY87 has the glass treated with silicone to improve insulation in humid environments.

The anode bell is held from the top on three rods.

Looking between the lower shield and the anode bell, one can see the heater and cathode tube. The latter is oxide coated for part of the length. The cathode is only supported from the base.

The thin glass tube envelope is 22 mm in diameter, and excluding the B9A base pins is 67 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type DY87 was first introduced in 1955. See also 1955 adverts.

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 June 27, 2023.

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