cafe latte Posted September 8, 2020 Share Posted September 8, 2020 They all wobble (uni pivots) some less than others, the damping goop, string or magnets just reduce the amount they dont eliminate it. Chris 1 Link to comment Share on other sites More sharing options...
metal beat Posted September 8, 2020 Share Posted September 8, 2020 1 minute ago, cafe latte said: They all wobble (uni pivots) some less than others, the damping goop, string or magnets just reduce the amount they dont eliminate it. Chris I think Bob Graham would disagree with you. Link to comment Share on other sites More sharing options...
andyr Posted September 8, 2020 Share Posted September 8, 2020 20 minutes ago, cafe latte said: They all wobble (uni pivots) some less than others, the damping goop, string or magnets just reduce the amount they dont eliminate it. Chris 19 minutes ago, metal beat said: I think Bob Graham would disagree with you. Bob certainly would! At least my G2.2 had a silicon bath which the pivot point rested in. I can believe that this might 'work ' better (in terms of wobble) than Duc's 'UniVector'. Then again, shirley any 'wobble' would reveal itself in loss of resolution … and a confimed digiphile who came and listened to my system last year said "I'm amazed you can get so much resolution from vinyl ". (This is with Duc's arm.) However, my other arm is a Magnepan 'Unitrac' - from the 80s. This is interesting because - although it is a UP … the downward-facing spike rests in a ball race (not a cup). So maybe this makes for less 'wobble ' than a spike resting in a jewelled cup (or a cup resting on top of a spike)? Andy Link to comment Share on other sites More sharing options...
metal beat Posted September 8, 2020 Share Posted September 8, 2020 14 minutes ago, andyr said: Bob certainly would! At least my G2.2 had a silicon bath which the pivot point rested in. I can believe that this might 'work ' better (in terms of wobble) than Duc's 'UniVector'. Then again, shirley any 'wobble' would reveal itself in loss of resolution … and a confimed digiphile who came and listened to my system last year said "I'm amazed you can get so much resolution from vinyl ". (This is with Duc's arm.) However, my other arm is a Magnepan 'Unitrac' - from the 80s. This is interesting because - although it is a UP … the downward-facing spike rests in a ball race (not a cup). So maybe this makes for less 'wobble ' than a spike resting in a jewelled cup (or a cup resting on top of a spike)? Andy Bob uses magnets to stop any wobble on all his current tonearms. 1 Link to comment Share on other sites More sharing options...
VanArn Posted September 8, 2020 Share Posted September 8, 2020 (edited) J . Walton solved the stability problem of unipivot arms by adding de-coupling bearings to the pivot weight cup. That occurred around 1960 and it was known as the Acos Hi-Light pickup arm. Unfortunately it only accepted the heads that were designed to operate at very low tracking pressures, 1 gram for the mono and 2 gram for the stereo model. Not being able to use other cartridges was a drawback. Edited May 31, 2021 by VanArn Link to comment Share on other sites More sharing options...
cafe latte Posted September 8, 2020 Share Posted September 8, 2020 10 hours ago, metal beat said: I think Bob Graham would disagree with you. They all wobble no matter if damped, the wobble can be reduced with damping, strings magnets etc, but they wobble no matter how little they do. Chris Link to comment Share on other sites More sharing options...
cafe latte Posted September 8, 2020 Share Posted September 8, 2020 9 hours ago, metal beat said: Bob uses magnets to stop any wobble on all his current tonearms. The magnet wont stop ANY wobble it will reduce the wobble. Chris Link to comment Share on other sites More sharing options...
metal beat Posted September 8, 2020 Share Posted September 8, 2020 (edited) 46 minutes ago, cafe latte said: They all wobble no matter if damped, the wobble can be reduced with damping, strings magnets etc, but they wobble no matter how little they do. Chris 44 minutes ago, cafe latte said: The magnet wont stop ANY wobble it will reduce the wobble. Chris Feel free to read about the magnaglide system. Have you used a Graham arm? https://www.analogplanet.com/content/graham-engineering-phantom-b-44-tonearm-page-2 Edited September 8, 2020 by metal beat Link to comment Share on other sites More sharing options...
cafe latte Posted September 9, 2020 Share Posted September 9, 2020 7 hours ago, metal beat said: Feel free to read about the magnaglide system. Have you used a Graham arm? https://www.analogplanet.com/content/graham-engineering-phantom-b-44-tonearm-page-2 No but I understand how they work. Chris Link to comment Share on other sites More sharing options...
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