The UR2 is a rectifier with a mesh anode and dates from 1934-5. The Universal range of valves were designed to have their heaters run in a chain across the incoming mains with a Baretter to stabilise the current. The UR2 was specified for use as a full wave rectifier, a half wave rectifier with both halves in parallel or as a voltage doubler. The heater cathode insulation was substantial to allow for the stresses of a large heater cathode voltage differential.

The lettering is at the top of the envelope and provides basic operating details.

The classic envelope is 40 mm in diameter, and excluding the Ct8 base pins, is 95 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah	Va	mAa
	30	0.2	250	120

This exhibit was last updated on 24 July 2005