Phono cable, are they really different?


Going to VPI from SME, will need some RCA to connect from junction box to phono stage.

Was thinking of using a spare pair of Audience AU24 I have since used phono cable are not common and usually pricey. Are phono cables really constructed differently and if so what's the difference? Will I be better off building myself a pair instead of using a regular RCA cable?

What do all of you VPI owners use? Anyone compared both and heard any difference?
semi
Outlaw Audio sells truly great interconnects at unbelievably low prices. OCC Copper, twisted pair, dual shielded, quality RCA's.

Half meter pair $34.95, or 4 pairs for $119.95!

Before wasting a ton of money, read this Q & A from the Outlaw website:

Q. The PCA cables list "OCC" copper as a main feature. What is OCC copper and how is it different from conventional oxygen-free copper?

A. The OCC process for refining copper was developed and patented by Professor Ohno of the Chiba Institute of Technology in Japan and is licensed to our manufacturer for use in the production of wire and cable products for the audio/video industry. In conventional processing, hot molten copper is poured into a cooled mold for extrusion, resulting in multiple, fractionated crystal structure. While the copper may be "pure" in the sense of measuring gas impurities in the copper in comparison to standard copper refining techniques, Oxygen Free Copper (OFC) has undesirable effects that lead many to use more expensive materials such as silver for their conductive strands. As developed for A/V cable use, the OCC process utilizes a heated mold for casting and extruding, with cooling taking place in a separate process. The result is a larger crystal size and increased purity that approaches the 6N, 99.9998%! Looking at it another way, traditional copper has oxygen impurities of 200 to 500 parts per million (PPM), while traditional OFC copper reduces that to less than 10 PPM. With the OCC process, the figure is cut in half to less than 5 PPM of oxygen, and less than 0.25 PPM of hydrogen (compared to 0.5 PPM for OFC). With these results, the OCC process creates "ultra-pure" copper, and thus the acronym for the copper material is more properly known as "UP-OCC", for Ultra-Pure, Ohno Continuous Casting. Summarizing the benefits of the UP-OCC material used in our PCA cables you get the following:
• A true unidirectional copper crystal that is as free from impurities as possible to prevent corrosion
• Flexibility and fatigue resistance without impairing conductive characteristics
• Low electrical resistance
• Rapid signal transmission

We are proud to be one of the very few brands to offer UP-OCC products.

Q. What is the construction of the PCA interconnects?

A. We are firm believers in the use of twisted, twin conductor construction for analog audio interconnects. This type of construction is superior due to the natural hum and noise reduction when twisted pairs are used, something not possible when coax type construction is used for audio applications. In addition, the use of twisted pair construction allows us to build semi-balanced style cables, where the ground is lifted at one end. This allows for a further degree of noise immunity not possible when coax style cables are used for audio applications. To further increase the transparency of our cables, the PCA interconnects are designed in a "dual-symmetrical" configuration, with two separately jacketed conductor paths for each side of the cable.

Q. How do you handle shielding?

A. The PCA cables have a dual shield system to isolate them from RFI and EMI as well as the digital noise that permeates today's complex audio/video systems. A 100% coverage copper foil shield, as opposed to the less expensive aluminum shield used in competitive products, is the first line of defense, covered in turn by a high-coverage copper braided shield. This dual system gives the maximum possible defense against both high and low frequency intrusion into the audio signal path.

Q. Anything else?

A. The PCA cables have an internal fabric braid and the outer covering is a tough, clear PVC jacket. The connections are made with silver content solder and high quality locking connectors are used.
Oops - I hit send on the previous post accidentally before finishing it. What I was going to add is that the Phono signal is different in that it is a very low voltage compared to CD or other front end signals. So it is much more susceptible to RF interference, and simple loss through cable resistance, and distortion through any cable anomaly.

The Outlaw PCA cables' construction with full double shielding and OCC copper (minimal crystalline structure) are therefore excellent for phono use. (I do have a VPI table, too.)
I originally purchased VPI's phono cable with the purchase of my Scout TT. Detail was good, but there was this nagging hum in the background that I could never pinpoint. I found later that I was picking up 60 cycle house current because the cable was not properly shielded.
The solutions:
+ Purchased 2 pair of interconnects from the-music-cable.com(Has full copper shielding with locking RCA's)Stiff enough to hold out in front of you.Go see...
+ Grounded TT, phono pre-amp and tonearm base in the usual fashion to a copper rod driven 6 ft in the ground outside.
Now there is a dead quiet background providing a very musical top to bottom sound.
I have a VPI Scoutmaster going into a Supratek Chenin and I use Discovery Essence. So far I've been very happy with the results. The difference between that and a pair of Homegrown Silver Lace ICs I was using before was subtle but noticeable.