Sensibly equivalent¶ to:
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.
References: Data-sheet & Kajetan Rozycki. Type CCa was first introduced in 1958.
Absolute Maximum Operating Conditions¶
Updated February 22, 2013. shape:thin.glass.tube construction:all.glass type:double.triode age:1960.1975 base:b9a heater:6.3v pins:9 pin:1.a pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.a pin:7.g1 pin:8.k pin:9.s