You guys may have seen this already, since it is a couple of years old, but I just came across this while doing a little bit of research on Jeff Bagby's PCD:
Zilch's 414Z-based econowave
Zilch did an impressive job building this thing and as usual, he was very generous with his documentation. I have a pair of 414-8Cs that I am tempted to try this with once I get done with my 604E project...







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