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In Reply to: RE: Aural Symphonics AS-One Phono Cable??? posted by Duster on August 22, 2015 at 16:04:39
Ok, it has a 5 pin din plug, which has a hot and ground, for the left and right channels. The fifth one is for the separate ground wire, that you usually hook up to the ground post on your phono preamp. About a foot from the din plug the single cable splits into two cables, one each for the left and right channel, ending with a rca plug.
In those two lines, I am finding an extra green wire. Four wires in a shieded cable, black and white to the positive, red and the shield to the ground terminal on rca plug. And a green wire in each cable not hooked up to anything.
Follow Ups:
By what you describe, each stereo channel of the cable is a twisted quad (black, white, red, & green color-coded conductors) with a braided shield. However, the green conductor (assuming a negative/return wire) floats at the rca connector end of each cable for some reason, perhaps because the shield *might* be connected at both ends of the cable? Have you inspected or tested the DIN plug to find out if the shield is connected to one of the DIN plug contacts, or if it floats at that end of the phono-level cable? If the shield is connected at both ends of the cable, the designer may have decided to use the braided shield as a negative/return wire, and found that omitting one of the return conductors from the signal path sounded better when the braided shield is implemented as a negative/return wire instead. This is just postulation on my part, but it's the only scenario that makes sense from what I gather.
Because the shield is connected to the negative wire at the RCA plug end, it will be connected to the negative on the din. I never thought to see if the green wire was connected to the din. I do know the separate ground wire, running outside of the cables is connected to the dins middle pin. Din has five sockets +/- for left and +/- for right channel. I run a step up transformer, and eliminated the last of my noise by removing the ground wire from the power supply of the battery powered preamp.
I think it is fixed for now, but I really want to replace the phono cable. I will remove the WBTs and throw on some cheap Daytons. If I sell any of the items I have listed, and get my non working Dyna 70 based Nobis Calibre up for sale/sold. The cabinet, transformers and most of it are fine, they just need some one who is into modding, to troubleshoot, and maybe replace the solid state first stage. My local tech tells me the fets get noisy, and are no longer available.
Morrow audio has a trade in deal going now, so I may try one of their phono cables,or go with something from AQ any thoughts or suggestions? Money is tight.
Jelco and 1877 tonearm cables seem to be good moderate-cost level products to consider.
Both are specialized phono-level cable designers.
Jelco:
https://www.usahifi.com/products/tonearm-cables
1877:
http://www.partsconnexion.com/wire_tonearm_1877.html
Duster, I was looking at the Jelco site, and it says they make tonearms for other companies, including Roksan. Well it looks like my Tabriz ZI is made by Jelco. That was a surprise, although I think the floating ounterweight is a Roksan add on.
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