Those older Sony receivers are nice sounding I bet .That when Sony made quality stuff I'm sure it solid state not tubes .it could be Hybrid tube solid state. It looks fabulous and Ive never heard one I she sounds good.
The 6036 should get a quick nod here. I haven't had a 6050 through here but a couple of 36's and they were quite similar. Might be sharing some pcb's even. Once serviced, I was impressed with alot of what you touched on. Sonically warm and full. A little slow for techy metal or electrowhatever but The Stooges sounded right at home. Piano jazz with female vocals was dreamy smooth. ARGH the dreaded power switch!
Nice review. how this unit compares to the 6060 /6055 strictly by sound quality and power capability ? your comment on bass performance is interesting because some say that 6050 has a deeper bass than 6060. also i saw somewhere that real power of 6050 is 40 rather than 30 watts.