The ECC83 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. Mullard describe the ECC83 as a high μ double triode, having separate cathodes, primarily intended for use as a resistance-coupled amplifier or phase inverter.

This valve is still found in todays designs of hi-fi audio amplifiers. In the classic Mullard designs of the 1950s and 1960s the valve's two halves were used as second stage amplification and cathode coupled phase splitter.

The phase splitter being required so that the push-pull output stage was driven correctly.

By clicking on the link on the valve name above the full Mullard data sheet my be found. This is a large PDF file.

The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 48 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(2)	g(2)	k(2)	h	h	a(1)	g(1)	k(1)	hct

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	250	-2	1.2	62.5K	1.6

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This exhibit was last updated on 06 December 2008