The DY802 is an EHT rectifier for monochrome TV service as colour television tubes usually required 25 kV EHT.
The 1.4 Volt heater was designed to be run from a winding on the transformer supplying 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.
The lower screen connects to pin one as can be seen in the foreground of the image. The oxide coated cathode tube is central in the anode bell.
The thin glass tube envelope is 22 mm in diameter and, excluding the B9A base pins, is 65 mm tall.
Reference: Datasheet. Type DY802 was first introduced in 1965.
Absolute Maximum Operating Conditions¶
Updated January 25, 2016.