Quote Originally Posted by GMichael
Can you still call this amp an Adcom after all this? Seems like you are building an amp from scratch and just keeping the shell it came in.
You are probably right. What started out as small as changing the input coupling capacitors mushroomed over a period of years to what I have now. I haven't made any changes to the actual circuit designs just replaced most of the components with higher quality ones. My Dyna MK-III's are more in the line of new amps. The only thing they have in common with the originals is the transformers and the choice of output tubes. I designed new hard wired input driver boards (no PCB) using a 6CG7/6FQ7 as a driver and a 12AT7 as a phase splitter. I had experimented with a solid state power supply but it needed a soft start circuit to allow easy tube warm up so I went back to a GZ34 rectifier tube. The RCA tube manual (out of print) has been invaluable for any kind of tube design work. I have used high quality parts with my MK-III's also.