I Need NEC uPC20 & uPC575 App Notes/Data Sheets

[Howard Eisenhauer]

Hi, as the titles says I'm looking for data sheets/application notes
for the NEC uPC20 & uPC575 audio amp chips, they don't seem to be
available on line anywhere .

If you have any idea where I can lay hands on them or if you have one
or both that you could scan & send I'd be v. grateful .

Thanks,

Howard.