05-01-08: Hjp
The Mk I has an all vacuum tube audio circuit. The Mk II has an all solid state audio circuit (not just the input stage....all)
This is not correct. The input stage uses J-FETs followed by 6H30 tube for the 2nd gain stage and another 6H30 as a follower/output driver. That's why there are four 6H30 tubes (two per channel).