Dear Howard,
With the SPU the distance from the collar (of the headshell) to the stylus tip is exactly 51mm. Ikeda clearly designed the FR7 with the SPU in mind and chose that same distance. This is why both these types are correctly aligned to Stevenson geometry when the arm is installed with the P2S specified by FR. Apparently your dealer installed the arm with the Dennesen protractor, which is preset for the Baerwald geometry. That alignment is preferred by ’experts’ and obviously there’s no problem if you have a ’normal’ cartridge that can be adjusted in the headshell. But these fixed headshell types can never correctly aligned in the FR using Baerwald.
Do follow chakster’s advise and get yourself the Feickert tool. If you look up the specified P2S distance of the FR66 and set the ruler of the Feickert at this distance you can figure out if the top plate of the arm pod allows a position that corresponds to that distance. If so, than your FR7 and SPU cartridges will be correctly aligned to Stevenson.
Of course choosing this setting will require repositioning your other cartridges to Stevenson as well. But using the Feickert tool that’s a walk in the park. The experts will advise against this change as they religiously follow Baerwald and dismiss Stevenson. You can judge for yourself: if they are correct the performance of the Koetsu should take a dive after its alignment has been changed from Baerwald to Stevenson. Conversily, by now correctly aligned the performance of your FR7 and SPU’s might improve considerably. Either way, this may prove to be an interesting experiment!
Keep us informed!
With the SPU the distance from the collar (of the headshell) to the stylus tip is exactly 51mm. Ikeda clearly designed the FR7 with the SPU in mind and chose that same distance. This is why both these types are correctly aligned to Stevenson geometry when the arm is installed with the P2S specified by FR. Apparently your dealer installed the arm with the Dennesen protractor, which is preset for the Baerwald geometry. That alignment is preferred by ’experts’ and obviously there’s no problem if you have a ’normal’ cartridge that can be adjusted in the headshell. But these fixed headshell types can never correctly aligned in the FR using Baerwald.
Do follow chakster’s advise and get yourself the Feickert tool. If you look up the specified P2S distance of the FR66 and set the ruler of the Feickert at this distance you can figure out if the top plate of the arm pod allows a position that corresponds to that distance. If so, than your FR7 and SPU cartridges will be correctly aligned to Stevenson.
Of course choosing this setting will require repositioning your other cartridges to Stevenson as well. But using the Feickert tool that’s a walk in the park. The experts will advise against this change as they religiously follow Baerwald and dismiss Stevenson. You can judge for yourself: if they are correct the performance of the Koetsu should take a dive after its alignment has been changed from Baerwald to Stevenson. Conversily, by now correctly aligned the performance of your FR7 and SPU’s might improve considerably. Either way, this may prove to be an interesting experiment!
Keep us informed!