Tboy make a good point. A Model T is basically a 5F6A front end, a Master Volume control and an Ultra-Linear power amp. There arent any examples of ultralinear power amps using 6V6s I can think of but Hammond makes several transformers in the 15 to 30 watt range that would work fine. Just decide if you want two or four 6V6s, pick an OT, then find a PT that will give a B+ in the 375 to 425 range. Use the Model T schematic as a guide.