The LN309 is a television audio triode output pentode. It produces enough output power at 2.2 Watts for an average domestic room.

In the envelope the two electrode systems are side by side.

Another M-OV sample in the collection shows a slightly different appearance.

This valve is badged with the Osram trade name.

The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 47 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	at	gt	kt	h	h	ap	kp,g3	g2	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAs	ra	gm	Pdiss	Pout
	12.6	0.3	170	170	-9.5,mAa_30	5	53k	5.5	5.4W	2.2W

Triode	Va	Vg	mAa	ra	gm
	250	-8.5	10.5	7700	2.2

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 12 June 2007 {find valves by name}