My thanks to Charlie for scanning and emailing me the schematic.
I found the problem. When I replaced the lytics, I had miswired the source to the wrong side of the 22K resistor which feeds audio output. I couldn't figure out why there was a dramatic voltage drop after the tubes warmed up.
A stupid error made this set drive me cuckoo.
I corrected my mistake and the set now lives.
Here is the set before restoration:
After pic will be posted to the gallery.