The 6CW5 is an output pentode with an anode dissipation of 12 Watts. It is designed for a higher anode current and lower anode voltage than the EL84 and thus suitable for use in TV receivers where the rectifier mains gave lower HT voltages.
This design would also suit transformerless audio amplifier designs of the type called single ended push pull see data-sheet. It was also specified for use as a series regulator.
Made in Germany - suggests after re-unification in the 1990s.
This is a true pentode with three wire grids. The control grid has copper supports and heat radiating fins.
Close-up of the top mica components.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 70 mm tall.
References: Datasheet & 1040. Type 6CW5 was first introduced in 1956.