ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
interesting read
http://www.angelfire.com/sd/paulkemble/sound4.html
not just marketing puff then
To get the best interface between a stylus and a record, it is best to replay the record in exactly the same manner in which the master was cut, ie; tangentially, 15° from the normal, although some high-spec cartridges will use a far higher angle. Radial arms will obviously, because of the trajectory induced in the stylus' travel, introduce distortion that remains of intense discussion, but nevertheless satisfies the majority of tastes. To obtain carrier-channel information, or improved high frequency performance, a defined stylus edge is required, and a decent tangential deck.
Tangential arms will not only reduce radii errors by at least an order of magnitude, but will reduce stylus and record wear. A high quality record deck with a radial arm giving a stylus to pivot mass (Me) of 9gm will exert on a record of some 650 grooves (counted on the radius, a record having only two continuous grooves, one on each side) played once a week for five years some 315,900 ergs, enough to lift a 63kg man 5cm off the ground. A tangential arm offering a Me of 4gm will exert 140,400 ergs, or 56% less.
Useful examples are the Beogram 6000, Revox B795 and the compact Technics SL-10.
Make your own B&O tonearm and use any P-Mount cart :-)
Useful DIY references are posted by Traddles
http://www.audioasylum.com/audio/vinyl/messages/3/33675.html
I've spent a lot of time on Paul Kemble's web site in the past. He doesn't elaborate just on turntables, but on amplifiers in particular.
Much if it is probably over the head of those who don't understand analogue electronics, but if you do, it's really good reading. Nice to see analysis on different amps and implementation principles without the nonsense you see elsewhere - he seems to appreciate most of what B&O did in the good years, although comments on the partly unnecessary complexity in some cases (as all of us who have to figure out how things work from the schematics can relate to)
http://www.angelfire.com/sd/paulkemble/soundindex.html
--mika