W.E. 500 Series Set, with 425A Network, and 426A Tube, and C3A Ringer.

[Dan/Panther]

This particular model uses a C3A,  2 wire ringer. Please note polarity on L1 vs. L2.
I want to thank Bill Guerts, Jorge Amely, and Jim Stettler, for the help on this set up, it took a couple days to get it right. Everything works very well including the tube, which is a great display all in itself. If you get the chance to have a 426A working set up, remove the black paint from the 426A with a razor knife, and watch the show.