Threshold Stasis 1 and 72 output devices

I have a pair of the SA/12e also which really makes my desire for the 1600e even more odd. I've compared the schetics of both, as I remember they are very similar. It's been a while but I think they are parallel vs bridged design .... I think ....
Correct like the S/1000 and SA/1.
Stasis 1 got a very bad review from Harry Pearson of TAS back in the days.
They were completely into tubes at TAS in 1981. Now it is one of the most sought after amplifiers. Believe NP updated a couple himself,
but there was never a official Threshold 'E' series update for it like there was offered for the Stasis 2 & 3.