The CV1959 is an audio output beam tetrode designed for series heater chain use. The prototype was the American 50C5.
The anode covers the inner structure. The control is clearly wound on copper rods for good heat transfer and at the top of the supports is a heat radiating fin.
The ripples in the glass tube distort this image of the lower mica.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 57 mm tall.
