2. analog
  3. 1269982038

MintLP Protractor for the JMW-9T tonearm

I was just about finished with my order of a MintLP protractor for my Scout's JMW-9T tonearm when an issue with the geometry of this particular tonearm arose. Yip from MintLP at first assumed the tonearm was the regular JMW-9, which has the same effective length as the Signature version. When I sent him a link to the description of the 9T from the VPI website to make sure he knew it was the upgraded version, he said he had made a mistake as the description stated that the 9T had the same geometry as the Rega RB-300 and could be dropped onto any Rega armboard. He suggested I contact VPI to get a definitive answer about the 9T.

So I did contact VPI and they responded that the 9T indeed has the same geometry as the Signature and the same as the Rega. So I'm now a little confused why Yip seemed to think the Rega RB-300 and the JMW-9 have different effective lengths? Is anybody familiar with the above mentioned tonearms and can confirm either way to settle this? I'd hate to waste over $100 on a custom made protractor if it's made on a wrong assumption.

Thank you.
actusreus
2002ss335
84 posts
 
I have never owned a VPI but I have read many threads concerning its geometry. Here is a link that should help.

VPI tonearm geometry

Regards,
Todd
dan_ed
2,451 posts
 
My take is Kip wants to give you a good tool that will serve you well. In cases like this where there is a question as to what the actual effective length is, I believe he wishes the purchaser to do the running down of the information needed. Anything less is an assumption and his protractor is too precise for assumption. Rather safe than sorry.
actusreus OP
733 posts
 
Oh boy, my head is spinning after reading this article. So basically there is no clear answer regarding the geometry of VPI tonearms. If so, I wonder how effective the Mint protractor actually is for VPI tables and tonearms. Owners of VPI gear seem to swear by it just as owners of other tonearms, but without actually being able to verify the effective length, mounting distance and null points, how can you actually claim that your cartridge is set up optimally? Sounds like you might as well use the VPI jig and be $100 richer.

Anyone with the new JMW-9T to prove me wrong? I'd love to hear feedback from VPI owners who have used the Mint protractor with their VPI tonearms.
dougdeacon
3,338 posts
 
The clear answer with regard to VPI tonearm geometry is that VPI has consistently refused to provide clear answers. That has always been the case. :-(

The article Todd linked was a great piece of research. Does it apply to the 9T? Only more research will tell.
More to discover