Hi Samuel,
For a number of years I have used an IC that I liked a lot, the MC33178 by TI. It's an interesting animal that combines relatively low noise (8nV/sqrtHz), low current drain (0.42 mA typ) and high drive capability (+/-12v into 300ohms). Surely not the fastest opamp in the world, but it is very stable, tolerant to layout design, in short the ideal all-rounder. After having used several tens of thousands in production, the distributor said the product was discontinued, so I had to use other products. In many cases, I replace it with the JRC2068, except for output stages, where the 5532 is stlll a very strong contender.
I've just found out that the MC33178 is stil current with ON semiconductors, in its Pb-free guise at http://www.onsemi.com/PowerSolutions/product.do?id=MC33178PG
Just to add to the superlative job you've done so far, that would be interesting to see how these two relatively obscure parts, the 2068 and the 33178, behave in your series of tests.
At the time I had conducted all sorts of tests including DIM, but the most important was that nobody ever complained about any restriction in sound quality, although many sound aficionados would churn on its meagre 2V/us slew rate.
I had also used huge quantities of JRC4559, in positions where its low noise (same as 5532) and low consumption (same as a TL072) were appreciated (mainly in the " "gyrators" " in graphic EQ's.
For a number of years I have used an IC that I liked a lot, the MC33178 by TI. It's an interesting animal that combines relatively low noise (8nV/sqrtHz), low current drain (0.42 mA typ) and high drive capability (+/-12v into 300ohms). Surely not the fastest opamp in the world, but it is very stable, tolerant to layout design, in short the ideal all-rounder. After having used several tens of thousands in production, the distributor said the product was discontinued, so I had to use other products. In many cases, I replace it with the JRC2068, except for output stages, where the 5532 is stlll a very strong contender.
I've just found out that the MC33178 is stil current with ON semiconductors, in its Pb-free guise at http://www.onsemi.com/PowerSolutions/product.do?id=MC33178PG
Just to add to the superlative job you've done so far, that would be interesting to see how these two relatively obscure parts, the 2068 and the 33178, behave in your series of tests.
At the time I had conducted all sorts of tests including DIM, but the most important was that nobody ever complained about any restriction in sound quality, although many sound aficionados would churn on its meagre 2V/us slew rate.
I had also used huge quantities of JRC4559, in positions where its low noise (same as 5532) and low consumption (same as a TL072) were appreciated (mainly in the " "gyrators" " in graphic EQ's.
