2. analog
  3. 1332245803

Multiple arms, multiple cartridges and geometry?

I have read the debates regarding the benefits of different tonearm geometries......Lofgren A and B, Baerwald, Stevenson etc....and I appreciate the benefits of choosing where, on the vinyl record, one wishes to have the least spread of distortion.
I also have read where certain arms seem to perform better with one or other of these geometries?

I have two turntables with three different arms on each one and I have a total of over twenty five different cartridges.
Four of those arms have removable headshells and twenty of my cartridges are mounted on their own headshells ready for installation into any of those four tonearms.
How then.......can I have different geometries for each arm if I don't wish to re-align a cartridge within its headshell depending on the arm in which its installed?
Surely......I must select a single geometry for all my arms so that the cartridges fixed to their headshells....are truly interchangeable?
128x128halcro

Showing 5 responses by nandric

nandric's avatar
nandric
4,086 posts
 
Dear Henry, You need, it seems, to start a new. I hope that
you own no more then 400 Lp's so you can rearange them according to the distance of the outer groove to the spindle. Assuming 3 geometries you will have then 3 kinds
of LP's collections which is 3x more then we, the other, have because we own just one collection. Then you should mark all your tonearms according to the new ranking or geometry while the same should be done with the carts/headshell combos. This way you will have 3 kinds of every kind while thanks to the markings no confusion
will ever (more) occur.

Regards,
nandric's avatar
nandric
4,086 posts
 
Dear Henry, Sorry, I overrated my Sliwowitz capacity. My
consideration was: the distance between the lead out
groove to the spindle differ by the most LP's. Depending from this distance Stivenson and Bearwald will give different inner 'O' points which means that one will be
more optimal than the other in (co) relation to the LP
you intend to play. You can estimate the distance or measure and then decide which tonearm (aka geometry) to use. Ie the geometry is primary about the records and only
'indirectly' about the tonearms.

Regards,
nandric's avatar
nandric
4,086 posts
 
Dear Henry, So far as I can overlook our members only Thuchan and Raul will really understand your effort. The rest of us can only repeat after Hawking ('History of time'): 'to many variables'.

Regards,
nandric's avatar
nandric
4,086 posts
 
Addition. With so many variables one can forget about the
constants. Why do you assume 'constant records' while the distance between the modulated inner groove and the spindle is variable? What is the sense of '0' point at an position on the record with no modulated grooves? I thought that
the different tonearm geometries are about those 'o' points. Ie we are supposed to have the choice among them. That is to say where on the record we want them.
My idea is to have Stivenson and Bearwald and then select
one of them by each LP depending from the mentioned distance.

Regards,
nandric's avatar
nandric
4,086 posts
 
Dear Henry, My father hated two kinds of the human kind:
the politian and the phylosopher. The reason: 'while everybody else try to solve some problem those two are only causing problems'. The phylosopher even for the sake
of argument (aka invented problems) for which they are willing to kill each other. They also invented 'the idea of the idea'. Well those '0' points are in a sense phylosophical points. We need to have the(firm) idea that those points are in the right place. Otherwise we can't sleep in a healty way. The trouble is that there are different
geometries with different '0' points while we are not sure
which are the right one. BTW my father killed himself when
his son enrolled the faculty of phylosophy...I heard about Freud much latter.
Regards,
More to discover