Audiolab 8000A advice (MKII or MKIII ?)

I just have the possibility to upgrade from a MKII Serial no. B Audiolab 8000A to a MKIII serial no. E. The S.no. D/E/F, for what I know are the last generation of the 8000A series and have Class II insulation protection (2 pin IEC socket) and guess other toroidal transformer. From what I've seen, none of the different Serials have same TALEMA toroidal.
I need to upgrade hence the transformer of my Audiolab started a gentle humming (and I can't find another same values discontinued transformer).
I was wondering what are the modifications done on the MKIII versions and if there are significant changes in sound???
Here is a internal view of my S.no B and here the E serial
 
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I am sure you will get many detailed answers from owners here but I have rarely seen so many versions of this amplifier ,with the same amount of variations on sound quality.


Actual year of build seems to make a big sound quality decision and the fact the first original version was 50Watts but yes--many changes in transformer versions .


I will leave detailed answers to actual owners as they will have more knowledge on sound quality depending on the version.


As an example post the mid- 90,s are "said " to "sound better " but all agree when Tag Mclaren took over --"they were never the same " --maybe they fitted Formula 1 engines instead ?
 
The MKIII versions were the last made, therefore they were built in the mid 90s, shortly before the other remote controlled versions came out.
Hope someone here has listened to and tested the different editions and is willing to share sound experience.