The DY802 is an EHT rectifier and was not listed in the 1960s although one would expect it to be for monochrome Tv service. The other potential use is in instrumentation such as oscilloscopes. The 1.4 Volt heater was designed to be run from a winding on the transformer suppling the EHT. This would be an HF transformer similar to the line output transformer of a television receiver.

The DY802 is designed for a maximum PIV of 30,000 Volts and will produce an output voltage of 20,000 Volts. The maximum reservoir capacitor is 0.003 μF.

The anode bell contains the indirectly heated cathode as can be seen above. The distance between the cathode and anode is large to prevent a flashover. The shield cup below the anode is to provide the maximum protection from x-ray emission.

The thin glass tube envelope is 22 mm in diameter and, excluding the B9A base pins, is 65 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah	Va	mAa
	1.4	0.6	20000	0.5

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 06 July 2007 {find valves by name}