2D21

RCA 2D21

Thyratron tetrode relay or grid-controlled rectifier

Introduced in 1950

1	2	3	4	5	6	7	Base
g1	k	f	f	g2	a	g2	B7G

Vf	Af	Va	mAa
6.3	0.6	400	100

Equivalent

5727, CV797, EN91, PL21