As per my understanding and from the Tech specs, the SP10 is essentially the 1200 without the tonearm assembly and 1200 stock plinth.
Hardly. The design and construction of SP10 is very different. For broadcast purpose, it was sold as motor plus outboard power supply (SH-10E). Buyer supplies plinth and tonearm.
The domestic version was called SL 1100. It came with the very sexy obsidian plinth (some sort of volcanic glass, black like black marble and bit translucent), and I think the EPA 500 tonearm.
Quick and Dirty specs comparo:
SP10-II /
1200-II
Platter: 2.9 kgs (6.4 lbs) /
2 kg (Mk II)
Starting torque: 0.6 Nm /
0.15 Nm
Moment of Inertia: 380 kg per cm^2 / ?
Time to reach nominal speed: 0.25s (about half a revolution) to 33 rpm. Stopping 0.3s from 33 rpm /
0.7 s to 33 rpm
Motor controller: outboard (SH-10E) /
inbuilt
Wow and Flutter: 0.025% /
0.025% wrms
Rumble: -73 dB /
-78 dB
Control: quartz controlled phase locked servo /
quartz
Motor: Brushless DC motor, electronic rectification /
Brushless DC motor
Weight: 9.5 kg motor + PS, without plinth /
12.5 kg
Tonearm Effective Mass: NA /
12g
Speeds: 33, 45, 78/
33, 45
Pitch Control: 10% /
8%
Speed fluctuation by load changes: 0% within 5kg-cm / ?