As the Cadet is almost identical to the Selmer Futurama Corvette, it is assumed that it was produced during the same time-frame, i.e. late 1963 to late 1964.
Valve line-up 2 x ECC83, 1 x EL84 and 1 x EZ80.
The Cadet in three different forms - the Futurama Corvette, the Selmer Corvette 6, and the Fenton-Weill Cadet. All made by Fenton-Weill to the same internal design. (Thanks to James Payze for a unique photo!!)