The N37 is a television type audio output pentode.

The load impedance is 6000 Ohms and the cathode resistor is 330 Ohms. At 10% total harmonic distortion the valve can produce 2.3 watts of audio.

The red Marconi label covers most of the envelope circumference.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 58 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	g1	k	h	h	a	ic	g2

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	13.0	0.3	165	165	-11.4	29.0	5.4	23200	9.5

This exhibit was last updated on 18 July 2007