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 Post subject: Geometry a RB330 arm
PostPosted: Thu Oct 11, 2018 10:06 am 
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Joined: Fri Mar 07, 2008 4:34 pm
Posts: 271
Location: azilda, ON, CA
I am about to set up a buddies new Rega P3 with a Dyna 10x5 cart. Now I know about the VTA, my question is; can I set the RB330 arm with the Mint protractor that I have for my RB300 arm? :?
Doug


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 11, 2018 10:23 am 
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Joined: Tue Dec 07, 2004 4:18 pm
Posts: 2814
Location: GTA, ON, CA
Yes, both the RB300 and RB330 have a spindle to pivot mounting distance of 222mm.


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 11, 2018 10:25 am 
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Joined: Thu Jan 26, 2012 10:34 am
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Location: Ardrosssan, AB, CA
I am pretty sure they are both 222mm pivot to spindle.


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 11, 2018 11:26 am 
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Joined: Mon Jan 08, 2018 11:32 am
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Location: Kitchener, ON, CA
http://www.rega.co.uk/rb330-tonearm.html

Effective mass - Low / 11g
Overhang 17.2mm
Mounting distance platter center to arm hole center 222mm


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 11, 2018 3:24 pm 
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Joined: Fri Mar 07, 2008 4:34 pm
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Location: azilda, ON, CA
Thank you for your replies. I was aware of the mounting distance of 222mm, but the effective length is 227mm for the RB330, while the RB300 is as we all know, is 239mm. So this got me confused and threw me for a loop!
Doug


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 11, 2018 4:10 pm 
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Joined: Thu Aug 18, 2005 12:27 pm
Posts: 2768
Location: London, ON, CA
dougroach wrote:
Thank you for your replies. I was aware of the mounting distance of 222mm, but the effective length is 227mm for the RB330, while the RB300 is as we all know, is 239mm. So this got me confused and threw me for a loop!
Doug


The RB330 overhang/effective length numbers are indicative of a Baerwald alignment (or at least something very close to it). On the other hand, the 15 mm overhang and 237 mm effective length spec on the 300 are a Rega proprietary alignment which is closer to Stevenson.

Unless you specified a custom protractor from Yip, he probably supplied you with a Mint based on the 300 specs for your 300. That would not stop you from using it on the 330 as long as the slots in the headshell allow you the room fore and aft to secure the cartridge to achieve the proper alignment. But you'd be aligning, in that case, with the Rega alignment (closer to Stevenson) as mentioned above, as opposed to the Baerwald alignment.


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