The LN309 is a television triode output pentode. It produces enough output power at 2.2 Watts for an average domestic room but was designed primarily for the frame timebase stage. It was first advertised in 1953.

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.

References: Datasheet & ¹⁰⁴⁰. Type LN309 was first introduced^¶ in 1953.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(t)	g1(t)	k(t)	h	h	a	k,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 PDF datasheet

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