Radfordman
pfm Member
I did not like my 405 (bought new in 1976), sat on a shelf for years, changed the op-amp for TL071 and amp was pretty good.
Later I upgraded the boards to 405-2 (bought from Quad) and to be honest could not tell the difference to the 405 with TL071.
Later I upgraded the boards to 405-2 (bought from Quad) and to be honest could not tell the difference to the 405 with TL071.