The classic 807 beam tetrode. The original design came from RCA and this example of this once ubiquitous RF and audio valve is from Westinghouse.
The parameters given are for single ended use. When used in a class AB1 as a push pull pair with 600 Volts on the anode an output power of 65 Watts was normal.
A fluted top cap and plain mica discs top and bottom. Westinghouse have not seen the need for ceramic insulators. The lower screen is the iconic elliptical shape.
The anode sides are stitched together.
The classic envelope is 51 mm in diameter, and excluding the UX5 base pins is 128 mm tall.
References: Datasheet & 1040. Type 807 was first introduced in 1938.