Hello all, This would be my first amp build and I am looking build a AB763 style head out of this eyelet board designed by Rob Robinette. I am looking to make this "Blackvibe" into a head that has an effect loop. Ideally it will have a transformer that can switch between 4/8/16 ohms. I figure I'll use Classictone transformers unless someone recommends others, but, I don't think I want to spring for a Mercury Magnetics. Layout - https://robrobinette.com/images/Guitar/AB763_Models/RR763_BLACKVIBE/RR763_BLACKVIBE_Layout.pdf Would this be a good output transformer http://www.classictone.net/40-18006.html Where would I integrate/(wire) the effects loop? Has anyone tried the Metropolis Zero Loss loop in their build? https://store.metropoulos.net/products/zero-loss-fx-loop-kit Thank you in advance.