Cable Asylum

RE: Capacitance question on JR CC89259/1506A IC

68.222.113.99

Jon Risch

In Reply to: RE: Capacitance question on JR CC89259/1506A IC posted by marchewd on August 16, 2007 at 09:50:01

It depends on the actual spacing of the shield, and whether or not the filler pieces are put in, etc.

What I would consider a properly constructed cable, with shield ground as per my recommendations, runs approx. 17-20 pF per foot. If you skimp on the spacer material, etc., then it could run as high as 30-34 pF per foot. due to the closer proximity of the shield.

A naked twisted pair can be as low as 12-14 pF per foot, without any shielding present, and laid out in open air away from metallic objects.

Jon Risch

Follow Ups:

RE: Capacitance question on JR CC89259/1506A IC - marchewd 11:22:12 08/16/07 (2)
Jon,
Thanks. It has the extra shield braid and teflon tubing as spacer material. I think I contructed it pretty well. I was just curious since I am using a set of the CC IC's as a phono IC.

Thanks again,
Dan
- RE: Capacitance question on JR CC89259/1506A IC - Jon Risch 20:21:58 08/17/07 (1)
  Be aware that most RCA plugs have anywhere from 18 to 30 pF of capacitance or more, all by themsleves. DIN plugs to plug into tonearms can also have a signficant amount of capacitance, and the RCA input jack will also have about 1/2 to 2/3 the capacitance of an RCA plug.
  
  Minimize the effect of the capacitive loading on an MM by using slightly lower load R than nominal, instead of 47 kohms, try 33 kohms, this will tend to damp the HF peaking and make the capacitance value less critical. It might make some MM cartidges sound a bit 'soft' in the HF's, but if you listen for awhile, you will find it is a more natural HF.
  
  Jon Risch
  - RE: Capacitance question on JR CC89259/1506A IC - marchewd 22:59:17 08/17/07 (0)
    Jon,
    Thanks for the answer. I am currently using a MC cartridge. I think the cable sounds great, but I read somewhere that the capacitance of phono IC's makes a big difference in sound. I have a straight run from my cartridge clips to RCA plugs on my tonearm, so there is no DIN connection. I guess I was just wanting to make sure that a different cable wouldn't make an impact in the sound. I made about 15 pairs of your CC IC's and love them, as well as making a SPDIF coaxial cable and straight 89259 sub cables. I even made the CC89259 speaker cables. They all sound fantastic. Even my wife could tell a big difference when I got everything hooked up, and she never comments one way or the other.
    
    Thanks again,
    Dan

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