There are probably 100's of Thousands of TT users of which a Large Proportion are types who do not know much of anything about TT's, apart from the need to level one, and have a Tonearm > Cartridge set to a particular geometry.
These types will I assume all be quite adept at replaying vinyl and useful disciplines to be maintained.
Within such a group a smaller proportion 'might' care to know a little more about their TT's such as the design for speed stability, torque, and the correct matching of Tonearm > Cartridge and maybe even consider the correct loading requirements for a Cartridge.
Within the smaller proportion there are a much smaller proportion and very rare type, that obsess in a manner that is a Polar Opposite and even does not seem to have any interest in taking part in the enjoyment of replaying music.
The whole attention is appearing to be focusing only on the the mechanics and electronics and not at any time reflect that the ownership of a HiFi System is basically about replaying music recordings and enjoying the moment.
I have travelled to meet many like minded individuals and throughout the years, during this time, I have encountered what is in my assessment the odd obsessional type, and I have found it to be best practice not to engage to much, as the fun of the days events can easily be obscured by excessive laborious Tech Talk.
The OP has requested that options on TT's are suggested and is working their way through the ones that has been offered.
There are quite a few things been made known, in relation to Plinth Materials to be used for a Design, along with the best configuration on the Plinth for the Tonearm Lengths to be considered.
Designing a Plinth for Two Tonearms is desired and if the Plinth Design was able to support a Longer Tonearm, that would be a future proofing consideration that can be incorporated.
An alternative if the Plinth Design was not wanted to have a provision to mount a 12" arm or longer would be to use an ancillary that would enable this at a later date.
The link will show a very recent thread that has discussed ancillary Tonearm Mounting devices, and give the OP a broader insight to how others, including contributors to this thread are expressing their thoughts on the use of such an item
I am sure that the OP's good judgement will help them make a choice for TT that produces a replay that is extremely satisfying, even if the TT has a 9", 12" Arm or longer and the performance is 0.025% rumble - 78dB - torque 1.5 kg.cm and not 0.015%, rumble -92dB torque 6.0 kg.cm.
It does seem from the overall input from the OP, they are keen to own a TT, that has a little creativity from their end contributed to the final assembly.
I am yet to see any concern from them for Microns, rumble and Torque available from a Model.
If the OP has been considering the Manufacturers Design Intent for a TT of interest.
The following has been supplied by Juergen, who is in my view a trusted source, and the Source of other info offered within this thread.
I think the info' clearly explains a enjoyable experience can be had when replaying LP's and a Tonearm of choice can be added, as long as it is off a certain length.
Source: Toshiba brochure from the 70s.
Toshiba STUDIO RECORD PLAYER SR-510
1. Direct drive
2. Electronically controlled servo motor
3.2 speed control
4. Sensor switching
5. Spot spirit level
6. Interchangeable tonearm
7. Preamplifier for electret condenser systems
1. Direct drive
Advantage:
In contrast to the previously known drive systems (friction wheel or belt), the axis of the turntable is one unit with the axis of the rotating part of the motor (rotor) in this studio turntable.
That means:
1. The rumbling noises that occur with this drive system are so low that they are well into the inaudible range.
2. Due to the direct power transmission, any slip is excluded; one reason for the exact adherence to the target speed.
3. The ramp-up time, in which the drive gets from standstill to the target speed, is within half a revolution.
2. Electronically controlled servo motor
Advantage:
The voltage level for the motor of the loudspeaker is constantly kept at the desired value by a photoelectrically generated control voltage.
That means:
Any deviation from the target speed is continuously compensated, the synchronization accuracy is better than 1/30,000.
3. Dual speed control
Advantage 1:
The target speed of 33 1/3 or 45 rpm can be roughly checked by means of a light display - too fast, normal, too slow.
Advantage 2:
There is a fine adjuster for each target speed, which can be used to adjust the indicator light (too fast or too slow) within a range of ±4%. The completely exact setting of the target speed is then carried out using the same fine adjusters with the help of an illuminated stroboscope.
That means:
With this ease of use, precise adjustment of the turntable speed has become possible for everyone; without additional measuring devices and also during operation.
4. Sensor switching
Advantage:
Turntable speed is switched by sensors. That means:
Sensors switch electronically without the application of mechanical force, ie only by briefly touching them. As a result, this process is completely free of cracking noises and vibrations.
5. Spot spirit level
Advantage:
A spot spirit level is installed in the housing of the drive, which enables precise sounding during installation with the help of the four spring-loaded and height-adjustable feet.
That means:
Uneven installation surfaces can be compensated with this device.
6. Interchangeable tonearm
Advantage:
The turntable and tonearm were mounted separately in the frame and have no other mechanical connection to each other.
That means:
The S-shaped tubular tonearm of the device with hydraulic tonearm lift and international tone head attachment can be easily exchanged for any other commercially available tonearm. 7. Preamplifier for electret condenser systems Advantage:
As a further component of the drive, a switchable equalizer preamplifier for electret condenser systems is already permanently installed.
That means:
The drive can be operated with both magnetic and electret condenser systems (e.g. Toshiba C-404 SY) without further upgrades.
Technical specifications
Drive: Type of drive: direct Motor: electrically controlled AC servo motor
Speeds: 33'/s, 45 rpm Speed deviations: ±0 Speed control range: ±4% Wow and flutter: ±0.03% Signal-to-noise ratio: >60dB
Platter: 300 mm~, 1.2 kg die-cast aluminum Run-up time: within 0.5 revolutions
Tonearm:
Type: statically balanced S tonearm eff. Length: 237mm
Max. tracking error: +1.5', -0.5° Overhang: 15 mm Tape head attachment: internal. '/2 inch Bearing pressure: 0 - 4 p
Tonearm lift: hydraulically damped Pickup system:
(drive can be delivered fully equipped)
Model: C-404SY
Type: Electret condenser Frequency response: 20 - 50,000 Hz Output voltage: 30 mV Channel separation: 25d13 (1 kHz), 15 dB (30 kHz)
Differences in the sensitivity of the channels: 1 dB
Stylus compliance: 15 x 10-` cm/dyne Bearing pressure: 1.5p, ±0.5p Stylus: EXTEND (special elliptical bevel for reading CD-4)
General:
Mains voltage: 110/120/220/240 V, 50/60 Hz
Power consumption: 14W Dimensions: W 550, D 414, H 190 mm Weight: 12.5 kg
Design: rosewood frame, smoke-colored acrylic cover Equipment: 2 cynch cables, 1 ground wire, 1 puck for singles, 1 screwdriver, liquid needle cleaner, velvet brush for cleaning records
