Vintage DD turntables. Are we living dangerously?

Halcro.
In the manual of the ET2 Bruce Thigpen claims that a pivoted arm contributes to wow and flutter due to its geometry.

The TT-101 has exceptional figures in this area.
Since you have a rig with 3 arms, it would be interesting to run 3 consecutive tests of say 1 minute each with the three arms. This to to see if there is any difference. Each arm has different geometry, so if Bruce is correct, we may expect to see a difference between the three readings.

Purely for academic interest.

Technics SP10 Mk3

No affiliation with listing party but thought you guys would be interested

Good Listening

Peter

If anyone was interested in an SP10 Mk3, this one may be better value as it includes tonearm and base...

Halcro.

I re-read my last post and realise that it could be misinterpreted. Clarification here...

BT suggests that when accessing speed accuracy with a pivoted arm, the measured performance is inferior to the actual performance. This due to the geometry of a pivoted arm.

Since you have a rig with three different arms, it would be of interest to run three sequential tests to see if there are any measured differences.
If there are, maybe we could infer that the TT-101 is actually better than the readings indicate.

Richardkrebs,
The measured performance is inferior to actual performance?

Wow and flutter can only be measured with an arm/cart. Timeline measures or illustrates absolute speed. Henry has shown that absolute speed doesn't deviate when using 3 arms simultaneously on his Victor.

W/F is measured with a test record 3150Hz tone. Output is checked for deviation from that frequency.
I think Thigpen must be referring to low torque belt drives, in which case a gnat landing on the arm or platter might upset speed stability.
Regards,