RB 300 template

[bear-hifi]

Would anyone have a mounting template for the RB300 tonearm? Thanks and yes I found a arm Frank ???

[JaS]

The template that came with my last RB300 is up in the tonearm section as 'RB series mounting template'. Once printed it should measure exactly 222mm from the arm hole centre to the spindle centre, I've provided jpeg and gif format images so that you can resize if neccesary. Regards JaS

[bear-hifi]

Thank you every much!  You and your site have been very helpful to me. Thank you for the GREAT site! Frank

[Seb]

Jas, come on, this is not the first time, you're a bad boy : a mounting distance of 222mm is not optimal if your intention is to have a baerwald aligment. It is only optimal when you follow rega recommandations (i.e a quiet stevenson aligment). You should consider the RB300 as a 237mm lenght tonearm and mount it consequently at 219.5mm from the spindle center. Seb

[JaS]

Hiya Seb, I haven't forgotten the controversy surrounding the Rega arms - maybe thats why they don't supply a manual or template online  ;) Having said that, I've never had any problem aligning carts either on my old Rega 3 or on armboards I've cut myself. Indeed if you cut the size hole Rega suggests then there is a good 1-2 mm of room for manoeuvre anyway. I don't use the Rega template for anything other than rough alignment though - I have a nice Baerwald two point protractor for that. I guess we'll have to agree to disagree on this one - there's enough evidence to suggest it shouldn't be right and yet I've never seen it in use (well not that bad)? Probably the placement of my arm in the hole...maybe I should attempt to measure the accuracy of my arm placement? Regards JaS

[bouquet]

Jas, come on, this is not the first time, you're a bad boy : a mounting distance of 222mm is not optimal if your intention is to have a baerwald aligment. It is only optimal when you follow rega recommandations (i.e a quiet stevenson aligment). You should consider the RB300 as a 237mm lenght tonearm and mount it consequently at 219.5mm from the spindle center. Seb

Baerwald expects 222mm from spindle to pivot , according to the instructions on the Rega Baerwald protractor in this forum.

[Seb]

I drew that protractor !

this protractor is the one you should use if you want to align the cartridge on your planar the baerwald way. The 222mm mounting distance is not the distance recommanded by Baerwald for a 237mm length tonearm but it is the actual mounting distance on rega turntable !

regards

Seb

[bouquet]

I drew that protractor !

this protractor is the one you should use if you want to align the cartridge on your planar the baerwald way. The 222mm mounting distance is not the distance recommanded by Baerwald for a 237mm length tonearm but it is the actual mounting distance on rega turntable !

regards

Seb

219,5 mm mounting distance should give me a slightly lower distortion ?

[Seb]

>219,5 mm mounting distance should give me a slightly lower distortion ?

yes (very) slighty

in fact, if your arm is already mounted, forget about it
if you wish to mount that arm, use 219.5mm

(for some cartridges, it may be hard to obtain the baerwald null points if your tonearm is mounted at 222 mm- this is the main reason of this mounting at 219.5)

regards

Seb

[bouquet]

>219,5 mm mounting distance should give me a slightly lower distortion ?

yes (very) slighty

in fact, if your arm is already mounted, forget about it
if you wish to mount that arm, use 219.5mm

(for some cartridges, it may be hard to obtain the baerwald null points if your tonearm is mounted at 222 mm- this is the main reason of this mounting at 219.5)

regards

Seb

Thanks Seb ,
I'll mount it at 219,5 mm.
No problem , as my TT has an adjustable armboard.

regards

Bouquet

[StephDale]

Seb,

I did it last night; yep I've cut a small arc of material out of the arm mounting hole on my Rega P25. I wouldn't recommend anyone to do it, it'd be very easy to screw up completely. But I was impressed with the difference it made to the tracking of my cartridge (Sumiko Blue Point Special). Subsequently confirmed with the HFNRR test record.

The only real pain was sitting infront of the computer for an hour to draw out the new protractor; I did one similar to the 'Kearns' one in the downloads area.

I simple jig made from plastic sheet confirmed the positioning of the arm as I tightened it down.

The P25 is certainly a great turntable, with or without mods/upgrades. Moving the arm centre helps to exploit it's qualities. For users of the Rega arms I can thoroughly recommend using the 219.5 mm centre distance...

Steph

[Seb]

Hi,

Thanks for your comment.

regards

Seb

[sanjivs]

A quick question, as suggested above, if I wish to mount a Rega/Moth 300/301 tonearm at a distance of 219.5 mm from the spindle, would I be able to use the Conrad Hoffman Alignment Template Generator to align a cartridge?

Why I ask is because when I feed this template generator with 219.5 mm as the spindle to pivot distance and choose the Lofgen A option (which I understand is the same as Baerwald); it calculates the effective length of the tonearm as 236.009 mm and not 237 mm. Is this much difference acceptable and close enough to do the job? Or will one have to use some other Arc Protractor?

Sorry, I am still trying to figure out all this…

Cheers,

[JaS]

Hi,
219.5mm is the correct mounting distance when you want to keep the 237mm effective length and optimise for IEC groove radii and Lofgren A.

http://www.vinylengine.com/tonearm_alig ... =calculate

If you have entered alternative groove radii etc then you will get a different result. Note that the required offset angle also changes so you may not be able to achieve every alignment that you can calculate.

Regards,
JaS