the AKAI AM-2650: Seeking Precision V~I Mod Insights

Hello everyone, I'm seeking suggestions for 'precision' current source/sink and RPS designs suitable for the Akai AM-2650 amplifier. More importantly, I would appreciate your input on whether such a mod/addition would be (audibly) advantageous for this machine. The schematics have been redrawn (with minor glitches) and are quite clear. I've already upgraded/matched the drivers to the MJE series and replaced the power output ones (and recapped it, of course). Thank you in advance for your insights!

here's the link from akdatabase: (also like to extend my gratitude to the individual who meticulously redrew the schematics!)

https://akdatabase.org/AKview/albums/userpics/10007/Akai AM-2650 Schematic.pdf
 

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