The CV65 is a directly heated battery pentode based on the Pen25.
The main image shows a rectangular slot in the first mica but no filament or tension springs remain. The top mica has holes where the springs would have been.
The retaining side mica pieces. Inside the bright anode can be seen the suppressor grid winding.
The many connections above the pinch.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 73 mm tall.
