EF1

Philips EF1

H.F. Penthode used in car radio and as LF amplifier

Introduced in 1934

1	2	3	4	5	6	7	8	top	base
m	f	f	k	g3		g2	a	g1	P

Vf	Af	Va	Vs	Vg	mAa	mAs	Ra	gm
6.3	0.4	250	100	-2	3	0.9	1,700,000	2.3

Equivalent

S629, VF1, WE17