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Vintage DD turntables. Are we living dangerously?

I have just acquired a 32 year old JVC/Victor TT-101 DD turntable after having its lesser brother, the TT-81 for the last year.
TT-101
This is one of the great DD designs made at a time when the giant Japanese electronics companies like Technics, Denon, JVC/Victor and Pioneer could pour millions of dollars into 'flagship' models to 'enhance' their lower range models which often sold in the millions.
Because of their complexity however.......if they malfunction.....parts are 'unobtanium'....and they often cannot be repaired.
halcro

Showing 4 responses by richardkrebs

richardkrebs
427 posts
 
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 
richardkrebs
427 posts
 
Best groove
I was referring to the time line laser at a 3.7 m radius

cheers 
richardkrebs
427 posts
 
@halcro 
unfortunately I do not having a working TT or system at present. There was a devastating fire which took out one of my amps, damaged my preamp and speakers.
The TT survived but the wiring from arm to Pre was literally vaporized.
I do not have a second arm or the ability to mount one if I did. But I take your point. Show me the evidence.

The time line is an interesting device, but I think that some may read too much into what it tells us.
It only shows us where the platter is relative to the last time the laser fired. Say 1.8 seconds ago.
It does not tell us what happened in between the two laser shots.

For example,  a stationary platter would pass the timeline test.
It is also possible to pass the timeline test where the platter is stationary for say 1/2 a second and then accelerates up to a speed considerably faster than 33.3 and back down to zero. As long as the platter is in the same place every 1.8 seconds, all seems fine.
We need more sophisticated equipment to find out what is happening between the laser shots.

cheers 


richardkrebs
427 posts
 
Halcro
I'm not shooting any messengers.
The time line is an excellent device which tells us average platter speed relative to 33.3 or 45 very precisely. 
However, if  want to properly measure real time platter speed, you need to have granularity down to arc seconds.
Once every 360 degrees is way too course.

cheers 
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