Vintage DD turntables. Are we living dangerously?

http://hifiheaven.net/shop/Phoenix-Engineering-RoadRunner-Tachometer-for-all-Turntables

I install these in my DP80 and DN308 rebuilds - they display to the third decimal point.  Whats the point of building a super accurate turntable if one cannot show it :-)  

http://pbnaudio.com/audio-turntables/vintage-direct-professional/dn308

I could not help but notice that a very popular BD table with two platters have a similar display device - it however only display with one decimal point :-) :-) :-) 

I have the Time line too use it at shows to demonstrate the accuracy of the GrooveMaster Vintage Direct Tables

Good Listening 

Peter

Technics claimed the SP-10MKIII would maintain speed with up to one thousand tonearms tracking at 2 grams each.

Sure, look at this photo from the 1976 Japan Audio Fair during the presentation of the Technics SP 10 mk2 what it could do without speed variations; The MK3 is even an even more powerful engine.


http://i949.photobucket.com/albums/ad331/marika-johnson/AA.jpg



@Halcro     ok  ;)

"Technics claimed the SP-10MKIII would maintain speed with up to one thousand tonearms tracking at 2 grams each."

The manual for my SP-10 Mk2A quotes maintained speed "even with a load torque up to 5 kg-cm (4.3 lbs. in.)"  That's only 500 tonearms tracking simultaneously at 2 g. each.  So obviously a very inferior performer.  ;^)

Halcro
re the 2 tonearm test.
Actually I would be surprised if any of the flag ship  DD TTs from that era failed this test.
Feedback and sufficient motor torque is all that is needed.
re the SP10 MK3, I don't run 2 arms, but I did a timeline test playing a record while forceably applying a carbon fiber record cleaning brush.
The dot did not move 3.7 meters away.
Not very scientific, I know,  but it is possible to apply much more torque this way than with a second arm.
It is also possible to significantly modulate this torque, which I did.
 No movement.

cheers 

The standard strobe on the turntable is not widely enough to control deviations?