You're right I did have them swapped at first - the 6X5 really lit up!
I did find another problem though. I screwed up and connected the black lead on one of lytics to ground. It should be connected to the AC line.
That brought the voltages back up to the proper levels and the picture improved quite a bit
My victory was short lived though. I had the set running for a while and it was working well when I saw a bright flash from the 6X5
I tested it and the filament is blown. Could be the brief time I had it in the wrong socket damaged it. I popped in a good one, but it's not working. The filament doesn't glow. Which is bizarre because all the other tubes are lit and it's a series wired set
Maybe the socket has developed a short ? Time to do some more investigating.