what changed...
90's to today? nothing.
70,80's vs. 90's yes. changed a LOT.
If you open user manual of 1980 equipment and 1990+ equipment you will see HUGE differences.
First off circuit, block diagram, service manual isn't published anymore. That is due to I guess depletion of normal human intelligence or something stimulating that depletion. If earlier people were smart enough to get to the bottom of problem by reading service manuals, now they can't. Now they get zapped and sue the manufacturer so service instruction ain't no good no mo pal since 90's.
My solution to this problem is using and servicing units that have circuit diagrams and user manuals and let the rest of crap disposed. So I assume nothing can possible beat 80's units that are the most advance, well built and serviceable.
