The CV5215 is a UK government code for the ECF80.

The triode is the oscillator and has to produce 5 V pk-pk signal. The screened pentode is the mixer. The valve has two cathode connections so that the two valves can be used separately if required.

The triode on the left is located at right angles to the pentode on the right.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(t)	g1	g2	h	h	a	k,s,g3	k(t)	g1(t)

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.43	250	180	-5.8	5.7	1.4	1.5M	2.1

Triode	Va	Vg	mAa	ra	gm
	100	-2	14	4K	5

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 04 July 2009