The EBC33 is a double diode triode. The design dates from the late 1930s. Mullard specify the device for use as an AF voltage amplifier for use at the end of an IF chain where the diodes would demodulate the AM signal and rectify an AGC control voltage, and the triode would act as the first audio amplification stage.

The external screening metalisation precludes an inspection of the actual construction of the valve.

The classic envelope is 35 mm in diameter and excluding the IO base pins and central locating spigot it is 88 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	m	h	a	ad(2)	ad(1)	-	h	k	g

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.2	250	-5.5	5	15k	2

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 10 June 2007 {find valves by name}