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Ed,
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Tonearm cables do take an extraordinarily long time to fully break in (buying a used cable is not a bad idea from that perspective). The low microvolt current running through the cable makes for some long break-in hours and as you pointed out, who wants to use up valuable cartridge hours on break-in.
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I have had dramatic success/results with my Audiodharma Cable Cooker that I bought from Allan Kafton at Audioexcellence.
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It works on power cords, IC's, speaker cables as well as Tonearm cables. Allan makes a Tonearm cable adapterthat you can buy that allows one to hook up from the cartridge clips and cook the cable from the clips all the way through din and or RCA's through to the termination that goes into the Phono stage.
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I had over 100 hours on my Graham IC-70 tonearm cable and was floored in the sound after I cooked the tonearm cable for about 30 hours. The Cable Cooker is not cheap, but one of the best investments I have made in audio.
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Alan claims that his Cable Cooker will break in a tonearm cable better than any amount of hours of regular use due. It also works on arms like Tri-Planar and Schroder that provide a continuous wire from tonearm clips to Phono Stage.
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Rgds,
Larry
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