SUT - electrical theory and practical experience

Dear @holmz  : Things are that's really weird that the rise time in a MM cartridge been faster than in a MC cartridge because it must be the other way around and maybe was the SUT who could had the culprit, at least everything point at the sut.

 

R

If you had an ishikawa chart of causal mechanisms, then it is possible that the inductance of a SUT could be on the list of things that limit the bandwidth.
Whether 500kHz or whatever the rise time corresponds to… is better or not, is uncertain.

Dear @holmz : Maybe you are rigth but today I know that the best SUT goes from 2hz-300khz almost flat and you have to think that are electronics that have not even that bandwindth.

My point about rise time is something different because transiente response live MUSIC is what " makes " MUSIC that at the end is a concecutive transient response notes.

By its design construction the fastest magnet cartridge is the LOMC against MM/MI/IM designs however the transiente response rise time at 1khz was measured and MM cartridge is fastest that a LOMC/sut combination and as I said the SUT made " slower " when thing must be the other way around.

With out facts my common sense tells me that a LOMC through an active bipolar hifgh gain design is way fast than the same LOMC cartridge + the additional IC cables and the SUT it self where both signal must pass through. So transient response that defines the notes/harmonics is slower through a SUT and this sole characteristic is an additonal and crucial disadvantage for a SUT.

All we know that, for example, the Etna SL quality level performance is better than the Etna that has higher output level, that’s higher inductance/impedance. Transient response rise time in the SL is faster.

R.

I forgot that rise time is from steady to the time to achieve 10% to 90% of the step response.

With out facts my common sense tells me that a LOMC through an active bipolar hifgh gain design is way fast than the same LOMC cartridge + the additional IC cables and the SUT it self where both signal must pass through. So transient response that defines the notes/harmonics is slower through a SUT and this sole characteristic is an additonal and crucial disadvantage for a SUT.

I am not a bat, nor hear like one.
I suppose that we can argue whether it is 20kHz, or higher bandwidth.

If the SUT was limiting the RF bandwidth, then it would also take care of the ringing at the high RF frequency that people talk about loading a SUT to stop.

How fast of a rise time do we need?

I would guess that the lower winding ratios would also have a higher bandwidth, or is that inductance also dependent upon the transformer core ?

I forgot that rise time is from steady to the time to achieve 10% to 90% of the step response.

If it is 50% duty cycle then it is “on”, in the half period, at the equivalent of a 2kHz rate.

10% of that would be 20kHz…
 

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.

tHOSE GENTLEMANS SAID:

" These measurements of cartridge circuit are of great significance to the user and illustrate why the cartridge's electrical output network has such a profound effect on the overall performance of the playback . "

r.