The BC-696 had been used in Worldwar II in bomber aircraft like the B-17.
The transmitter originally uses 28 VDC power and was operated in CW or AM voice mode. It has two 1625 tubes in the Power Amplifier and is capable of delivering 50 Watts RF in the 80 m band ( unit operates from 3 - 4 MHz).
Frontview BC-696 CW/AM transmitter
Top view opened BC-696
PSU, designed by PA2HGJ