Vintage DD turntables. Are we living dangerously?

Lew,

Mikey has used the Feickert Platter Speed App to test his turntables for years.
Just buy the test disc directly from Feickert
http://www.feickert.org/index.php?id=16&L=1
And download the free App to your phone or iPad.
The only problems I have found with it over the years is:-

• The test record is rarely drilled perfectly concentrically and the results are thus contaminated
• The results I achieve continually vary from test to test (even with the same turntable/arm/cartridge)

Still interesting nevertheless....

@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,
We've had that discussion as nauseum in the past.
To me it seems more a case of 'shoot the messenger'...particularly when it comes from those who disparage it.
Show the results....THEN disparage away 🙃

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 

Once i've come across the Tuchan’s blog with a picture of his "stand" for tt-101 i realized it reminds me something. It was beautiful OMA plinth for one for their turntables, but later i realized the orignator for that kind of "plinth"  was Jean Verdier (Laboratoires Verdier) who passed away 3 years ago. His website is still active and full of information, but the web-design of that page takes you back to the 90s when all internet was like that. I think for the round turntable drives like Victor TT-101 this is very nice style of plinth (or call it stand with tonearm towers). I think it’s awesome.