David Looser wrote:
"Phil Allison" wrote in message
...
"David Looser"
Indeed, unlike the 405 in which the TL071 op-amp is in the signal path.

** The original Quad 405 used LM301A op-amps.

http://www.geocities.com/quad_esl63/...c/power405.jpg


Well OK, but it was changed to a TL071 in later production.


The TL071 did not exist when it was designed.


So when was the 405 designed?, and when was the TL071 launched? I was using
TL071s (and TL072 and TL074 dual and quad versions) in the mid seventies,
and I've got an early production 44 control amp which is full of TL071s.


David.


405 released 1975 - ceased 1982 64,000 units
405-2 released 1982 - ceased 1993 100,000 units
44 released 1979 ceased 1989 40,000 units

I have no idea when the TL071 surfaced but it would have to be mid to late
1970's.