Enjoy.
Western Electric 2A turntable, ~1926, was created for broadcasting & Vitaphone movie sound systems.
The rare stereophonic version had a moving coil cartridge, the turntable ran at 33-1/3 rpm.
Flutter-and-wow was far less than any modern turntable. Rumble was -65 dB or better.
The tonearm's angular error is so low that a straight-line tracking arm wasn't seen as necessary.
This was achieved with cast iron parts, ordinary copper wire, common ball bearings and a 1 horsepower electric motor.

 

Enjoy.
Western Electric 2A turntable, ~1926, was created for broadcasting & Vitaphone movie sound systems.
The rare stereophonic version had a moving coil cartridge, the turntable ran at 33-1/3 rpm.
Flutter-and-wow was far less than any modern turntable. Rumble was -65 dB or better.
The tonearm's angular error is so low that a straight-line tracking arm wasn't seen as necessary.
This was achieved with cast iron parts, ordinary copper wire, common ball bearings and a 1 horsepower electric motor.

View attachment 337325

Proof of how primitive records are and why we (those that have record collections) love them.
https://forum.allaboutcircuits.com/threads/ht-old-home-theater-rebuild.183659/post-1706451

https://us.technics.com/products/direct-drive-turntable-sl-100c
Wow and Flutter
0.025%　W.R.M.S.

DDs are essentially free from rumble.

 

There's no replacement for ~65-pounds of Cast-Iron !!!

Back in the Disco-Days I solved the Feedback problem from huge Sound-Systems
with plywood support platforms filled with Concrete, and supported by 4 custom-made, 2.5" diameter springs.
They worked great.
.
.
.

 

Crazy that its made of 3 separate floating modules?
How do you insure the tonearm part is in the correct position?

 

Crazy that its made of 3 separate floating modules?
How do you insure the tonearm part is in the correct position?

The user's manual must've been an interesting document. I wonder if there are copies still surviving out there.

 

And uses a steel pin needle I suppose... What is the output? Just the pair of wires going to... Nice big counter weight (harmonic balancer?) on the back of the motor or is that the pulley to fit on a steam driven leather belt shaft drive? Also, looks like the drive/motor units legs have a rubber bushing between them and the cast iron base screwed down mounts. Which makes me think maybe that IS a harmonic balancer on the end of the shaft. The other 2 pieces have levelers but otherwise are floating and not screwed down. Very interesting... Used in a silent movie theater?

 

From what I would tell the direct drive motor is designed to also power a 35mm projector from the flywheel end.
https://www.itishifi.com/archives//2010/04/1926-western-electric-turntable-2a.html

 

There's no replacement for ~65-pounds of Cast-Iron !!!

Back in the Disco-Days I solved the Feedback problem from huge Sound-Systems
with plywood support platforms filled with Concrete, and supported by 4 custom-made, 2.5" diameter springs.
They worked great.
.
.
.

Squash balls work well instead of the springs. They add some damping.

 

Squash-Balls sounds like an excellent idea.

My Turntable "platforms" were around 24" x 18" x 4", and weighed around ~30lbs and
had a resonant-frequency of around ~4-Hertz.
Foam placed inside, and around the Springs, provided oscillation-damping.
Black Formica provided a nice "invisible" look when recessed into the top of a DJ-Booth.
No feedback, even when placed directly on top of a huge Bass-Cabinet.
.
.
.