Question on FR 66s

Dazzdax,
Have you checked the alignment with a good Protractor or Universal Template like the Feikert?
If it is easy for you to adjust the Pivot to Spindle distance of the tonearm....just do it so it aligns with the your preferred geometry (Baerwald, Lofgren, Stevenson).
Dertonarm has his own geometry which works very well for his UNIprotractor.
Just ensure that the off-set angle is OK at the Null Points and you should be fine.

Hi Lew, I believe Jonathan Carr has a point here. Sometimes I do hear something that you can call ringing when comparing vinyl playback with digital.
Of course it is not a proof this is due to the tonearm only because many other things can also contribute to this phenomenon.
Moreover, I find the bass reproduction is not state of the art: it is rather pompous and lacks definition and slam.

Chris

Hi Henry, I use the protractor which is supplied by the manufacturer of my turntable, Acoustic Solid. It is a Feikert like protractor.
Using the DB Technologies for the off set angle check at the null points.

Chris

Chris,

The issue about P2S and overhang using SPUs is something I've also struggled with using my SME M2-12R. Especially aggravating is the small de facto variance among SPUs that purport to have the same overhang. I read surprisingly little conversation about this issue, which will wreak havoc if one's armboard and tonearm-mount are unmovable.

I do what Henry recommends, which is to adjust P2S so that the SPU aligns with my selected geometry. Fortunately, the SME has a sliding mount; otherwise I'd be out of luck. I use arc protractors from MintLP and Accutrak, and I'm able get the stylus to track the arc almost perfectly. The UNI-Pro, which I also have, doesn't really work in this instance because it is contingent on a prescribed P2S.

Bill

Wrm57

If you use an integrated headshell cartridge like the SPU then you can't adjust the offset angle.

The SME arm you have is designed for LofgrenA (Baerwald). It is also designed such that that alignment can be set by adjusting the base for whatever cartridge is mounted.

In other words the P2S distance is variable, the effective length is variable and the offset angle is fixed. If you used a headshell and separate cartridge with sufficient clearance in the holes or slots, then the cartridge can be twisted to allow other alignments to be achieved (although Lofgren B doesn't require a twist, merely an adjustment of the sliding base.)

You can use any standard two point protractor to set up, or a the Dennison which works for any unknown mounting distance. (The Uni protractor uses the same principle, and doesn't require you to know or set the P2S, but it has to be Lofgren A/Baerwald.)

Unless you know the exact actual effective length, an arc protractor is not going to help, and if you did know it, it would only apply with LofgrenA/Baerwald.

If you have the wrong E.L, then the offset angle will be wrong for whatever P2S distance that enables the arc to be tracked.

John