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In Reply to: Baerwald alignment of my 103R on SL1210 posted by Ralph NLD on April 20, 2007 at 11:48:18:
Yes, it will need to be at least that far forward, maybe farther. There are two reasons. First, your tonearm is mounted so that a 15-mm overhang places most cartridges in the middle of the slots. However, Baerwald's alignment requires 17.8-mm overhang. Secondly, Denon DL-103 series cartridges have only 7.5-mm distance from stylus to mounting holes whereas most cartridges have around 9.5-mm. This means the DL-103 needs to be moved farther forward regardless of the alignment chosen.
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Here is what the difference looks like. The red line represents harmonic distortion at a stylus tip velocity of 10-cm/s.
Löfgren's alignment has lower RMS distortion, but it achieves that by having significantly higher inner groove distortion and slightly higher outer groove distortion. Personally I don't think that's such a good idea.
Baerwald's alignment has equal distortion at the three points of maximum distortion. I like that idea.
Now, these graphs are based on innermost and outermost groove radii of 60.325-mm and 146.05-mm respectively. Consequently, if you measure your LPs and determine they are different, say 65-mm and 145-mm for example, you can simply calculate a new set of Baerwald null-points for those parameters. In other words, if hardly any of your LPs have innermost grooves smaller than 65-mm, you will be better off calculating new Baerwald null-points than switching to Löfgren.
At any rate, I believe Baerwald's alignment is best, but you don't necessarily need to stick with null-points of 66-mm and 121-mm if your LPs do not conform to the specified innermost and outermost groove radii of 63-mm and 146-mm. You can easily calculate a new set of null-points using my spreadsheet, which can be downloaded at the link below.
Because the headshell doesn't allow enough movement? Do a 'as-good-as-it-gets' Baerwald or go to Lofgren?
Normally, you only need to alter cartridge offset by about one or two degrees at the very most.Give me more information about your tonearm and I'll make a recommendation.
using offical Baerwald is only a starting point. thanks.
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