Here is a custom ST-70 clone type amp built from parts by an Italian builder "Andrea". It looks to me like a Curcio driver board with three 6922 (6DJ8) tubes. Instead of a quad cap he used separate power caps. He also had to reinforce the chassis with a brace in the center of the chassis.
A link to more info (all in Italian) with other photos and diagrams is below. If you want to know what the text is in English, copy and paste the Italian text into an online translator ..
Custom ST-70 by an Italian builder
Google online translation