Turntable advice / opinion on setup / sound.

@necrosuit 

I owned a Rega P3 and P8:  they were decent turntables.  When I switched from a Rega cartridge to a different brand was the single best upgrade.  I tried Linn Krystal and then a (heavy) Koetsu Rosewood, and despite the Koetsu being to high, not using any shims, etc, it still sounded much better than the higher end Rega cartridges.  The Rega TT's are very sensitive to what they are sitting on, too much so, in my opinion; try different sound isolation devices under the feet.  Enjoy your TT, but also realize that the step you just took upgrading your cartridge is just a small step up in the analog world, and when you’re ready, you’ll be very impressed by higher grade TT, and phono stages.  

Seems to me some of the posters above have no clue, never owned a Rega.

Facts are - 

All Rega arms are 222mm pivot to spindle, 14.5mm overhang

Rega arms are designed for Stevenson alignment.

Rega protractor supplied delivers correct overhang and aligned for Stevenson for any cartridge, Rega or otherwise.

If you want to use Baerwald any 2 point protractor can be used - I use a Garrott 2 point protractor for most installs.

Experiences ( hands on, not from AI, and not speculation - P9/P10 )

Stevenson alignment works better than Baerwald on the Rega arms.

Non Rega cartridges - I have heard various Benz, Lyra Delos, and most of the Rega carts. The latest Aphelion 2 is a superb cartridge, a big step up from previous models. The Lyra Delos is superb for the price.

Most folk who buy Regas understand that you need to buy spacers to use non Rega cartridges for VTA adjustment. Rega dealers sell them.

@necrosuit 

The only thing I would suggest is that your antiskate is too high. Generally according to studies by Shure and others, antiskate should be about 25-30% of tracking force. Have a look at your cantilever from front on when you lower the stylus - you can usually see if it is pulling one way or other. I generally start with antiskate at 1/3 of tracking force and then check the cantilever, and listen to very small changes either way.

@dover thanks for the answers about Rega with non-Rega cartridges.

I still would like to know what the measurement is in ____ mm?

from center of spindle to the cross on their RB880 protractor provided.

@elliottbnewcombjr 

I would expect that is the inner null point for

222mm p2s, 14.5mm overhang, 21.55 degree offset angle.

Unfortunately I can't get into vinyl engine to calculate the inner null at the moment.

I note that vinyl engine has the wrong overhang listed for Rega arms ( 15mm )  so their published null points are incorrect. It is also possible like many arm manufacturers that the Rega alignment is close to but not exactly Stevenson, so you would have to use the vinyl engine calculator to generate the null accurately given the Rega specs.

Unfortunately there is a lot of misinformation on the net with regard to Rega alignment.

@elliottbnewcombjr 

https://www.rega.co.uk/download/rb330-retail-instructions-master-2017.pdf zoom in on page one.

https://www.rega.co.uk/download/TA-RB880-RETAIL-UNI.pdf

All RB series tonearms are cast from the same tool. The main difference is in the quality of the gimbal bearings and the vertical bearing housings which do not affect the geometry.