Heres a layout for the schaffer vega, it's using a lot of odd connections, I couldn't really make head or tale of it so I don't know if it works. Not my work.
I found someone who sold a clone of ht replica on reverb I think. He post this picture where we can see a transistor. I don't know wich one is the closest too the original but I hope it could help. Maybe just the buffer is a little bit different.