The 1821 is a Philips full wave rectifier on a B4 base with a brown composition base. The operating parameters are taken from the UU5 and thus should be considered as approximate.

The dome of the envelope contains the etched lettering. It is unusual to see a Philips valve showing as Made in England, possibly this was made for export.

See also UU5.

The balloon envelope is 52 mm in diameter and, excluding the B4 base pins, is 106 mm tall.

 
Pin Connections

B4	1	2	3	4
	a(1)	a(2)	f	f

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah	Va	mAa
	4.0	2.3	500	120

This exhibit was last updated on 12 October 2008