Gallien Krueger 1001RB owners, did they fix it? (plese help)
I am also interested the history, but cannot find the 'innovations' web page that used to be on the G-K site.
I did find an article about one of the older series, with some 30-odd published hardware changes, and additionals that were not published.
The -II series had cold-solder joint issues in the very early production, but I understand that was solved quickly.