BBAmp (BeBamp) bread board tube amp with no driver stage

This is this the rear of the bread board power amp showing the OPT case with speaker binding posts and RCAs. The On/Off switch and fuse cane be seen from here. Because the OPTs were of open construction I placed them in a metal case which doubled as a terminal block for speakers and input RCAs. The tubes are JJ Blue Glass KT88.