This exhibit is the Mullard ECC82. Designed as audio and general purpose triodes, two independent valves exist in the envelope. A special quality version was also produced, the E88CC, and for differential amplifiers in industrial equipment the anti-microphonic and matched pair version E182CC was also made.

An amplification factor of 17 is quoted, which is much lower than that for the pin compatible ECC83 at 100.

In television receivers the ECC82 was used as frame and line timebase multi-vibrators, AGC circuits and driver stages. It was as multi-vibrators that faults would most often develop.

We were surprised at the very low CV number, suggesting availability at the start of WW2 even though the B9A base is post war in the UK.

Another ECC82 in the collection shows a different style of lettering in this long lived device.

The thin glass tube envelope is 20 mm in diameter and the length excluding the B9A base pins, is 48 mm.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(2)	g1(2)	k(2)	h	h	a(1)	g1(1)	k(1)	hct

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	gm
	6.3	0.3	250	-8.5	10.5	2.2

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 11 October 2009