I promised !! PICTURES of 1976 Zenith soild state BW CONSOLE.

[zeno]

I didnt like the 19GB1. The vert outs went left & right on them
& they were a pain to change. Looks easy but you gotta pull
the heat sinks that were twist tabbed & soldered. The screws
were so tight taking them out invited a cracked PCB. Add to that
the PCB was almost like plastic & would kinda melt. And of course
when you heated the sinks the etch lifted.
I will take the duramodule any day. Near 100% reliable.
Better yet the hand wired SS 19" B&W, a rare bird.

73 Zeno