2. analog
  3. 173274-124530

How important is the cable between the SUT and phono pre?

I know when using a cable between a MM cartridge and the phono pre it's very important to take into account the capacitance of the cable for cartridge loading.

I don't recall seeing a discussion on the importance of using low capacitance cables between a SUT and  phono pre.  

I picked up a Denon Au-340 to replace my Denon AU-320 in my system and the AU-320 has built in cables that run to the phono pre, hence my question.

Is there a way to figure out the capacitance requirement for this cable or is it not that important? Will a good shielded cable work fine?

I don't want suggestions on some high dollar cables, that will never happen. I have about 15 or 20 pairs of cables that I picked up over the years, I can always go through the pile and measure the capacitance if necessary.

Thanks

 

BillWojo

billwojo
jpjones3318's avatar
jpjones3318
148 posts
 

Would love to see a cite with a detailed technical explanation.  I can’t find one, equivalent models I can find don’t show it, and a couple EEs I’ve talked to say it doesn’t.  Repeating a formula is not an explanation.  

imhififan's avatar
imhififan
2,176 posts
 

For transformer winding capacitance, please read the article on Jensen Transformers Application Notes "AN008" - Audio Transformer by Bill Whitlock

https://www.jensen-transformers.com/application-notes/

 

jpjones3318's avatar
jpjones3318
148 posts
 

Thank you for the reference.  Section 1.2.4 is in regard to inter- and intra-winding capacitance and electro-static shielding, which I understand.  While Figure 16 depicts secondary load C as CL, I do not see a reference to it in the text.  This section doesn’t seem to address reflected C.  

imhififan's avatar
imhififan
2,176 posts
 

@jpjones3318 

I think Chapter 1.3.2 or page 11 is what you looking for?

dover
2,241 posts
 

My laymans understanding of the scenario is that because the MC transformer converts high current low voltage LOMC to a higher voltage low current signal exiting the transformer an interconnect with high capacitance between the transformer and MM phono is more prone to noise intrusion.

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