Discuss The Viv Lab Rigid Arm

Dear @lewm  : Any one can argue about because it's a way incomplete ideal tonearm description that I'm not willing to " take " this time.

In the other side what you posted:  

" the stylus should always ride right down the middle of the groove. "

that could not happens not only in LT but pivot LT tonearms due that the tremendous forces generated during stylus tip ridding modulations impedes that groove after groove the tip stays just centered. As a fact the stylus tip is not always in touch with the LP grooved surface.

Anyway, I assume that you are not still ready to share your final veredict of what you are experienced. Yes, listening time is important in that issue.

R.

Dear friends: Even that lewm posted that it's not the main subject in the thread and yes it's not however I consider that's important for each one audiophile knowledge levels and especially because in this thread we are talking of tonearm/cartridge alignment, what this means and differences against ( mainly ) Löfgren A or B alignments.

Several times I posted about " corrupted " AHEE and here in the kind of alignments the " corrupted " word is the precise one because " invent " alignment or false alignment information is a kind of corruption. Examples of professional tonearm/cartridge protractor manufacturers:

Dr. Feickert site speaks of Löfgren, Baerwald and Stevenson alignments

Wally: speaks of Löfgren and Baerwald.

J.Ellison calculator speaks the same.

In both cases they " invented " a new alignment because Löfgren alignment just does not exist. What exist is Löfgren A and Löfgren B Additional they give an " honor " to Baerwald when he was not involved side by side with Löfgren in 1938 developed alignments equations.

I know not no body cares about but I do because in " theory " those " professional " manufacturers at least should have the responsability to share the rigth information to his customers that are all of us However what they are showing or trying we learn is corrupted information even if they do not did it on purpose.

For me both sites need some kind of explanatio for audiophiles can have first hand professional and true information.

Well, that's my take.

R.

Btw, only VE calculator named Löfgren A instead that Baerwald and obviously speaks of Löfgren B.

Raul, When I wrote that the stylus should always ride down the middle of the groove, it was perhaps a poor choice of words for what I wanted to convey, which I then tried to capture better in my follow on statement.  Of course, in reality the groove itself, because of its tortuosity, friction, and Newtonian mechanics, will toss the stylus tip around quite a bit, and this is sometimes an audible cause of mistracking.  But Mijostyn was laying down ideal parameters that cannot be perfectly adhered to, so I added to his list of idealistic goals.  In an ideal world, the tonearm and cartridge would be massless and therefore not affected at all by groove tortuosity.

Dear friends: I forgot to post on the protractor manufacturers that speak of Stevenson alignment that ( as with Lögren ) Stevenson alignment does not exist but Stevenson A and Stevenson B and no one of those manufacturers an even tonearm manufactursrs made any explanation about..

@lewm , agree with you but unfortunatelly there no exist that " ideal ".

Next information on alignment is important due that came from Löfgren him self:

" “From the shape and location of the curves, it results that the largest distortion risk occurs when the overhang is not correctly set for the linear offset. On the other hand, the angular offset itself is not so critical”

R.

" “From the shape and location of the curves, it results that the largest distortion risk occurs when the overhang is not correctly set for the linear offset. On the other hand, the angular offset itself is not so critical”

I don't think when Löfgren had the above idea that he considered the concept of an advanced profile and the possibility of dissimilar info on opposing groove walls.  I think those two additions make the correct angular offset (Zenith) as or more important than overhang.

dave