Dear @holmz : This is what the gentlemans that made it the rise time measurements said and through the internet looking for bipolar, FET or tube rise time measurements coicide exactly with:
" Response speed is general refered as transiente time and transient time is the figure of merit in comparison the ability of the cartridge to reproduce the instantaneous changes of MUSIC. Transiente rise time is determined using a square wave test signal ( 1khz. ). The transient rise time is the time elapsed from the point of the leading edge wen it's at 10% of maximum height to the point of the leading edge is at 90% of the maximum height. . This is the accepted engeneering measurement method which uses the most uniform segment of the leading edge to measure the transient rise time.Musical sounds are transients by nature. "
Differences between the MM/MC other the kind of motor design was that the LOMC cartridge was paired with an additional SUT and this is by common sense why the MM is faster in that transient rise time when obviously must be the other way around. SUT/cables is the culprit. Maybe not?
R.