Universal two-point protractor that uses Heybrooks chosen null points of 63.5 and 120mm Suitable for the Helius Aureus tonearm only Suitable for the Audiocraft AC300C tonearm only ![]() These protractors are tonearm specific or use alternative alignment methodology. The Arc protractor is suitable as a cartridge alignment protractor for specific tonearm lengths / mounting distances only (see instructions enclosed) For example, this could be used in conjunction with the tonearm database to compare the tonearm manufacturers alignment with the popular Baerwald type found in most aftermarket protractors.Ī mirror protractor, a variation on the classic two-point protractor - suitable for experienced users only! A quick and easy way for experimenters to judge the sonic merits of different alignment methods. This is especially useful for arms which have limited room in the headshell slots and can't be aligned satisfactorily with a Baerwald type.ĭesigned to allow users to align their cartridge at any two null points between 60 and 150mm. If you aren't sure which type to use and want a free alternative to the common shop bought designs, download this one.Īnother universal protractor, this time using the Stevenson alignment method with null points at 60.325 mm and 117.42 mm. Calculate geometry for your DIY tonearm designĪssess the effects of changing stylus overhang while keeping the original angle of the cartridge in the headshell Generic (universal) protractors Stupid ProtractorsĪ pair of universal two-point protractors, one using the more common Baerwald alignment method as used on 99% of commercial products and the other Loefgren B (see Seb's user guide above for an explanation of the difference).Discover the optimal mounting distance for a known effective length.Optimise alignment for your own record collection by adjusting for optimal groove radii. ![]()
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