A late 1930s receiving pentode. Mullard specify this device as for general purpose voltage amplification and for use in phase inverters etc. This valve was obsolete by the 1960s, and our data sheets show that the EF36 had identical characteristics and pin connections to the EF37 and EF37A. The (aad0108^EF37A} was particularly successful as a low noise low microphony AF voltage amplifier for high quality or Hi Fi use. These were all high gain low current audio frequency and intermediate frequency amplifiers in superhet receivers. With low capacitances they were useful at radio frequencies as well.

The classic envelope is 29 mm in diameter and, excluding the IO base pins, is 85 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	m	h	a	g2	g3	nc	h	k	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.2	250	100	-2	3	0.8	2.5M	1.8

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 04 June 2007 {find valves by name}