Sure, you can upgrade G, GR or even GAE by changing the tonearm (if you want), but why not buy used SP-10mkII or new SP-10R if you’re looking for higher quality turntables? You are limited with a choice of tonearm for SL1200GAE plinth, but you have no limits with SP-10mkII or SP-10R (except for the very short arms), you can use "10.5 or "12 inch tonearm easily.
So which cartridge do you use ?
Decca cartridge is definitely not good for Technics tonearm.
A cartridge with Shibata profile is good, especially the Victor X-1II
some mono shibata or decca? . microgroove mono
So which cartridge do you use ?
Decca cartridge is definitely not good for Technics tonearm.
A cartridge with Shibata profile is good, especially the Victor X-1II