Post by cooksferry on Jul 14, 2017 12:31:58 GMT 12
Anyone used the item below or similar. Once I have the 2nd arm setup on the table I'll have to find some way to handle two sets of phono cables in the phono stage. The RS stage has one set of RCA inputs and one set balanced. At this stage I have plenty of single ended cables but if I upgrade the cable in the Wand in the future Simon can terminate it with XLRs. Dont really want the expense of a balanced phono IC at this stage. The Y splitter looks like a reasonable solution unless anyone can give me a reason not to go there. The other choice is running single ended cables into XLR adapters at the amp but from what I've read that's not a recommended option.  ru image host
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Post by Owen Y on Jul 14, 2017 12:46:59 GMT 12
I can't see that this is going to work well, or work at all.... If one cartridge is working, it's signal will go through the 2nd cartridge's coil (not good for the wee coil), unless the latter is disconnected. (A MC coil is only say 10 ohms & the phono input might be 100-47k ohms - it will also load down the working cartridge & affect its performance.) If you then have to disconnect one cartridge, then you may as well avoid the extra connections by disconnecting (or switching) at the phono preamp. Unless I am misreading what you plan to do, cooksferry....?
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Post by cooksferry on Jul 14, 2017 12:59:53 GMT 12
The plan was the Y splitter will go into the RCA inlet on the back of the phono stage (need left and right )and I'll feed the ic leads into splitter, one set from each arm. Looking for an easy way to feed both sets of cables into one amp inlet. If that wont work I'll just swap the cable(s) over at the arm end when needed and use the one pair of ICs.
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Post by Owen Y on Jul 14, 2017 13:02:55 GMT 12
I see....then my comments will apply I think. Unless I am technically incorrect.
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Post by cooksferry on Jul 14, 2017 14:59:41 GMT 12
Bugger, thought I'd struck a cheap temporary solution. Owen, what are your thoughts on using RCA to XLR adapters 
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Post by Owen Y on Jul 14, 2017 16:57:59 GMT 12
cooksferry - I think XLR-to-RCA is do-able, but the other way around doesn't work. (Unless the preamp XLR input is not into a truly 'balanced' cct internally.) Pro-Ject Phono RS?
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Post by cooksferry on Jul 14, 2017 17:16:16 GMT 12
Yes Owen, Phono RS. Just random thoughts. As I said in an earlier post I'll get sorted with cabling nearer the end of the year. Up grade the arm wiring and terminate with XLR connectoirs and get a proper balanced phono cable to the amp inputs.
Hopefully going to pay a call to Design, Build in Dn next month so I'll talk things over then. Maybe get a sneak peek at the up coming TT.
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Post by Owen Y on Jul 14, 2017 17:29:42 GMT 12
Actually I'm unsure if RCA-to-XLR will.... - work or not - work poorly It may depend on the Pro-Ject RS cct design - maybe check with them, or their distributor.
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Post by Owen Y on Jul 15, 2017 7:18:52 GMT 12
What are your phono ICs, that you have to hand? They will likely be twin conductor type (twin axial), with shield (as opposed to single conductor core with shield) - in which case you can have them re-terminated with 3-pin XLR plugs - voila! If you have a spare pair.
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Post by cooksferry on Jul 15, 2017 14:05:25 GMT 12
Not sure that I have any dedicated phono cables Owen. Currently using an Audioquest Panther that solved a bad problem I had with humming after I switched to a LOMC. I have a few of the new KLEI cables and an older Eichmann one plus some Antipodes of various types and a couple of WBT cables . The Antipodes didn't work at all as a phono cable, fine every where else. Not sure about the others, been so long since I tried them but if one was suitable it could be sacrificed. How would this work. www.mediacollege.com/audio/connection/xlr-rca-1.html
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Post by Owen Y on Jul 15, 2017 14:18:16 GMT 12
The top diagram is good - where the 3 XLR pins are separately wired & the pin-1 blk wire is to be connected to the cable shield (not shown). The type of cable that you want (& your high quality hifi ICs should be of this type) is the bottom 'one pair/shielded' cable shown at bottom on this page (with separate shiled): www.mediacollege.com/audio/connection/cables.htmlI usually connect the cable shield at only one end (preamp end in this case) in order to avoid any 'ground loop' through the shield.
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