DY87 @ The Valve Museum

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DY87

Sensibly equivalent^¶ to:

152A 1S2A 1S2 DY86

See also:

Valves and their Habits

Extras ▼

Bentley Acoustic Corporation Valve Donation by Peter Bates (GM4BYF) 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.

The anode cylinder is at the top and connects to the top cap. The anode is closed at the top and so forms a bell. The stout wire support rod is fused into the glass at the top. The lower wider cylinder is cathode / screen.

The lower electrodes and base. The spot welds between the wires and electrodes are clearly visible.

The thin glass tube envelope is 22 mm in diameter, and excluding the B9A base pins is 62 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 January 04, 2022.

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