SUT - electrical theory and practical experience


Some vinyl users use a SUT to enhance the signal of the MC cartridge so that it can be used in the MM input of a phono stage.  Although I don't understand the theory behind it, I realize that a SUT should be matched individually to a particular cartridge, depending on the internal impedance of the MC, among other things.  

Assuming an appropriately / ideally matched SUT and MC, What are the inherent advantages or disadvantages of inserting a SUT after the MC in the audio chain?  Does the SUT theoretically enhance or degrade the sound quality?  What does the SUT actually do to the sound quality? 

Thanks. 

drbond

Dear @chrisoshea ; That gentleman that pass away was a tube lover and this and no other is the reason of his " fondness for SUT ", the SUT down there is a mustto have a necessity a " bad " necessity.

@lewm stop to wondering and solve it, in the mid time common sense is just common sense an a good response at least for me. Not for you? then solve it ! !

Btw, 300khz is an exceptional case, normally good SUTs goes to 60khz-100khz like LOMC cartridges and MM too.

 

R.

 

Wish I knew what you were talking about, Raul.  Solve what?  It was you who posted the information that your vintage SUTs had such a wide bandwidth.  Now when it does not suit you to admit your own facts, you want to reduce the bandwidth so you can claim sans data that the SUT must be what limits the rise time of the MC cartridge in the scenario.  Truth is, that was a badly done experiment, just because it introduces the SUT as another variable that may or may not limit rise time.  It's really not worth further discussion.  If you think MC cartridges sound "faster" to you than MM types, so be it.  There is nothing here to deprive you of your subjective impression.

@lewm : What words of this posted statement you just did not understand? :

 

" 300khz is an exceptional case, normally good SUTs goes to 60khz-100khz "

 

Now: " It was you who posted the information that your vintage SUTs had such a wide bandwidth "

 

Wrong, that bandwindth is the exceptional Technics SUT.

Solve what?: your wondering.

Btw, those measures were SUT and added IC cables.

and it’s not for me only that the LOMC cartridges are faster than MM ones: IT’S OBVIOUS. Not for you ok, follow wondering is fine for me.

 

R.

 

First of all, when did I say I disagree with you regarding the relative "speed" of the two types of cartridge?  Second, YOU posted the bandwidth of the Technics SUT when you were trying to claim superiority for vintage SUTs over some modern ones.  Yes, it's an actual number, I agree.  You're stuck with it if you want now to argue that the SUT used in the rise time experiment is reducing the apparent rise time of the MC used in conjunction with the SUT.  But like I said (twice at least), we lack data (frequencies, impedances, capacitance, inductance, etc), and whoever performed the measurements should certainly have re-measured the MC cartridge without the SUT in the circuit. 

Yes, I still wonder what you expect me to solve with virtually no data.  To achieve a bandwidth of 300,000Hz (at 0db), a SUT must have a rise time of at least .00000333 seconds.  Is that the solution you are looking for?  It's just a number that solves nothing.

Yes, solves nothing because it's not the real issue. Do you think that any MM cartridge is faster that your MC2000?, today I know that MM are near but still behind LOMC cartridge with an output level no higher than 0.4mv.

 

Btw, in this week I will pick-up my Denon AU 1000 that rigth now is under measurements mainly bandwindt and distortion levels. We will see.

 

R.