Uni-Protractor Set tonearm alignment


Looks like Dertonarm has put his money where his mouth is and designed the ultimate universal alignment tractor.

Early days, It would be great to hear from someone who has used it and compared to Mint, Feikert etc.

Given its high price, it will need to justify its superiority against all others. It does look in another league compared to those other alignemt devices

http://www.audiogon.com/cgi-bin/cls.pl?anlgtnrm&1303145487&/Uni-Protractor-Set-tonearm-ali
downunder
Oops. I made a few typos but it appears I cannot edit my post.
1) Note: datatables are tough to read but please use your imagination.
2) In para3, it should be "inner null point", not "inner groove null point" (guess I have inner groove on my mind...
3) I left out the third "Dert60" which is like a modified Stevenson because the benefits vs actual Stevenson or the other two are terribly significant.
4) Note that doing the algebra took 10. Figuring out how to write it took a bit longer. Hope it helps those in need of "proof" that numbers are numbers.
Dear T_bone: I'm confuse about your numbers.

In this link there is the calculations with graphics for 245mm EL:

www.vinylengine.com/tonearm_alignment_calculator.php?mv=&l=e&ev=245&i=i&c1=60.325&o=i&c2=&cal=1&submit=calculate

and don't shows your numbers. What am I missing here? before I go for your other numbers.

Could you guide me through VE calculator? which the link?, thank you.

Regards and enjoy the music,
raul.
Or the links for your calculations if are different from the VE tools.

Thank you again.

Raul.
Dear T_bone: Re-reading your post I found out those offset angles: 20.325/20.574 that I don't take in count ( I use the ones that gives the " natural " calculations, not forced ones. ) due that I use the VE calculator instead the comparator tool.

But I'm still missing something because this link calculations/graphics don't shows your numbers even that the input data comes from your post:

www.vinylengine.com/tonearm_alignment_comparator.php?m_el=246&m_oh=14.5&m_oa=20.325&compare=i&submit=calculate

Regards and enjoy the music,
Raul.
2) I simply did this to put a stop to the months of questioning. The exercise took me all of 10mins to do (given a pre-existing spreadsheet), far less time than has been spent on questioning whether the numbers come out this way....

Kudos T_Bone