If you ask him directly it will be much easier. He can give you much more info and help than you will ever find in the net. He doesn't bite!😉
I have found the Orfeo 2 here and you can see it was published on CHF (Costruire HiFi) #23:
https://www.bonavolta.ch/hobby/en/audio/211_2.htm
It is the complete schematics, including the power supply. The MRO PT8 (Philips telephone triode) is very rare nowadays but you can replace it easily (minor modifications) with the 26 or you could use another 10Y....
All transformers and chokes are still made by Megahertz Audio. They are not cheap but they surely are first class:
https://www.megahertzaudio.it/trasformatori/
The coupling capacitors should be ICAR oil caps, model SP25. Unfortunately ICAR company was in financial trouble a few years back and I am not sure it is still in business. But some of their stuff can be still found around.
The other one with the 10Y at the input and 211 driving the 845 might be in the same CHF #23 or some other number of that year. I would personally prefer the Orfeo 2. It's already a BIG amp with plenty of grunt to drive perfectly a lot of speakers. I think it should easily make some 20W.
Last edited: