The CV2300 is a selected 3A4 and is a miniature output pentode is specified for both audio and transmitter use. For a small dry battery valve 1.2 Watts output in the HF range would be quite an achievement. The ratings given above show a higher anode voltage and cathode current compared to the 3A4 and probably this made the CV2300 more suitable for transmitter use in battery portable or hand held sets.
The bright anode hides the inner structure.
Another view.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 46 mm tall.
References: Data-sheet & 1040. Type CV2300 was first introduced in 1957. See also1957 adverts.
