The CCa is a miniature double triode with an inter valve screen. The Siemens catalogue lists the applications that this high mutual conductance valve is suited to as:- A low noise universal twin triode for cascode, mixer and phase inverter stages, multivibrator and cathode coupled amplifiers.

For class A amplifier service the typical operating conditions would be an anode voltage of 220V and anode current of 9.2 mA. The load resistance would be 20 k Ohms.

Thanks to Kajetan Rozycki for the data from the Siemens 1962-3 catalogue.

The thin glass tube envelope is 19 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)	g1(2)	k(2)	h	h	a(1)	g1(1)	k(1)	s

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	220	-1	15.0	20k	12.5

Thanks to Frank Philipse for supplying the above datasheet

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