The CV1850 (commercially the 6L19) is a general purpose double triode. The ratings given by Wireless World are slightly different to the data-sheet. Possibly the valve was improved over time. No data-sheet for the CV1850 has yet been located.
The twin triode sections. Note the absence of an electrostatic screen between the sections - not an RF valve. The locating pip for the B8A valve holder is on the metal skirt of this all glass valve.
Face view of one triode.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 54 mm tall.
