The ECC83 copy from Zaerix was made in the German Democratic Rebublic, what we used to call East Germany, and imported into the UK.

The Mullard ECC83 is high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100.

The thin glass tube envelope is 21 mm in diameter and the average diameter for B9A valves is 20 mm. Length excluding pins is 48 mm.

 
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

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 06 July 2007 {find valves by name}