For something like an Aro/Keel, there is no play for cartridge adjustment.
Smart people buy an Ekos - which I understand has headshell slots - and don't have this problem. Or even a non-Linn arm.
Regards,
Andy
For something like an Aro/Keel, there is no play for cartridge adjustment.
Distance from pivot centre to centre of the offside cartridge bolt hole is 224.5mm. It's the same on all issues of the drawings I have so probably safe to assume this has not changed.
Linn did something that seems blindingly obvious: provide a third hole for the Troika, Arkiv, or Akiva but also provide slots so that any cartridge within reason can be used.Smart people buy an Ekos - which I understand has headshell slots - and don't have this problem. Or even a non-Linn arm.
Regards,
Andy
Thanks. When you say "offside", I take it to mean "outside"?
Any other dimensions you care to share?
John, which dimensions are you after?
Mark,
You seem to be confusing the issue. The Linn/Naim spec is 211mm making it ideal for a Linn MC cartridge with 7mm bolt to stylus distance. The Naim spec of 212.5 makes it ideal for a cartridge with a bolt to stylus distance of 8.5mm and makes it closer for a majority of other cartridges. Simple as that. I have no commercial interest but I am trying to clarify what others have failed to do.
And the above continues to be the elephant in the room with regard to a fixed sub-chassis with no play.
Distance from pivot centre to centre of the offside cartridge bolt hole is 224.5mm. It's the same on all issues of the drawings I have so probably safe to assume this has not changed.
There is no such thing in phono cartridges as a 'standard' distance between mounting points and stylus tip. It is for this reason that headshells are furnished with slots so go out a buy a proper tonearm instead of complaining about being locked into some manufacturers mindset.
Goto http://www.vinylengine.com/overhang_shift_calculator.php put the numbers in and look at the distortion plots. All three values, spindle-pivot, offset and overhang have to be right to achieve a given alignment. So if your cart isn't Troika sized then the alignment will be sub-optimal wherever you put the arm base.
Paul
2 points: the 224.5 mm dimension is for pivot to outer cartridge mounting hole, not for pivot to the midpoint between the 2 holes; and you can't simply add the numbers to get effective length because of the offset angle.Now I find that to be an interesting specification because Naim states the effective length of the Aro to be 229, 230 or 230.5 depending on what spec you believe to be true.
This statement was put out by the person on The Vinyl Engine who put together the tonearm database:
You can calculate the approximate effective length by measuring the distance between the horizontal pivot centre and the centre of the headshell slots and adding 9.5mm - this will give you the location of the stylus tip with an average cartridge. You could then either use the mounting distance of the arm which is closest in effective length, or optimise your mounting distance for Baerwald/Loefgren/Stevenson alignment using the alignment calculator.
If that 224.5 number is correct then I don't see any cartridge giving you any of the effective length numbers that Naim states unless someone knows of a cartridge with 6mm bolt to stylus, that would match with an effective length of 230.5mm.