The CY1 is another Ct8 based valve. The CY1 is identical electrically to the CY31 which is on an IO base. This half wave rectifier was designed to operate on universal supplies as it has a 200mA heater. The maximum reservoir capacitor is 32 µF and the minimum series resistance to limit in-rush current is 125 Ohms.

The CY1 and CY31 were introduced in 1939 as replacements for the UR1.

The classic envelope is 40 mm in diameter and, excluding the Ct8 base pins, is 93 mm tall.

 
Pin Connections

Ct8	1	2	3	4	5	6	7	8
	-	h	h	k	-	-	-	a

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah	Va	mAa
	20	0.2	250	75

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 02 December 2007 {find valves by name}