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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
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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
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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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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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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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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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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 25, 2018 1:20 pm 
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Joined: Tue Jun 10, 2008 3:10 pm
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Location: burlington, ON, CA
Anyone know about an rb330 on an older Rega table that had an rb300 on it? If so, is there anything different to it from a mounting point of view? I know the newer is a 3 point.

Also is the plinth to top of glass platter the same for old Rega 3 and new Rega 3?

I'm putting a DV 20x2L on the old table with new arm. I assume still needs 2 or 4 mm shim?

My table is set up now with rb300 and dv cartridge but the arm is very high. Its on a 3 point spacer ring on top height. I think that is 6 mm (or 8mm)? There is actually 4 mounting location heights on that ring.

From what I gather, the new arm needs a spacer to be like new table with that metal support brace, so that is 2 mm? This is also first position on that 3 point spacer ring. Then we will call this height 0 as its the "base" for the 3 point arms.


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 25, 2018 1:58 pm 
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Joined: Sun Dec 18, 2005 4:29 pm
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Location: Ottawa, 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


An effective length of 227mm does not sound right to me. That would mean an overhang of only 5mm. As far as I know, the effetive length for all Rega arms is 239mm.

I just checked the Rega site and it specifies 17.2mm overhang. Then the effective length becomes 222mm+17.2mm=239.2mm


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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 25, 2018 3:16 pm 
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Location: azilda, ON, CA
operafan wrote:
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


An effective length of 227mm does not sound right to me. That would mean an overhang of only 5mm. As far as I know, the effetive length for all Rega arms is 239mm.

I just checked the Rega site and it specifies 17.2mm overhang. Then the effective length becomes 222mm+17.2mm=239.2mm


That's what I thought as well. Here is what a member from the Rega forum stated; RB330 of new planar 3 has the effective length, 227mm, shorter than traditional Rega arm (237mm). With given the condition of Stevenson arc and 22 degree offset angle, equation solving result indicates that it has around 213mm P2S (mounting hole distance)
The stand alone version of RB330 has traditional 222mm P2S for compatibility in other decks. ALL I want here is just to get the facts. And I even emailed our distributor here, and he told me the same as you guys. And I have the Baerwald alignment protractor from Yip.


Last edited by dougroach on Thu Oct 25, 2018 3:24 pm, edited 1 time in total.

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 Post subject: Re: Geometry a RB330 arm
PostPosted: Thu Oct 25, 2018 3:20 pm 
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Joined: Sun Dec 18, 2005 4:29 pm
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Location: Ottawa, ON, CA
dougroach wrote:
operafan wrote:
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


An effective length of 227mm does not sound right to me. That would mean an overhang of only 5mm. As far as I know, the effetive length for all Rega arms is 239mm.

I just checked the Rega site and it specifies 17.2mm overhang. Then the effective length becomes 222mm+17.2mm=239.2mm


That's what I thought as well. But, a member from the Rega forum said that I was very wrong and was told "Mr. Fremer is not a scum reviewer to spread misinformation". ALL I want here is just to get the facts. And I even emailed our distributor here, and he told me the same as you guys. And I have the Baerwald alignment protractor from Yip.


I think there must have been a typo. Fremer is a very knowledgeable reviewer but mistakes can be made.


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