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In Reply to: RE: The Good News and the Bad News posted by jedrider on January 13, 2015 at 10:31:02
Assume the circuits are appropriate in the kind of amp it's meant to be; assume the circuits are correctly wired; then all you have to do to start is buy some better iron (PT, chokes and OPTs) and then maybe buy some decent caps, resistors, switches, attenuators and tubes.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
Follow Ups:
Just looking at the technological front, the level of integration is increasing all the time. Don't need to look any further than Class D amps!!
Also, the new crop of op-amps only seem to be getting better.
I'm an optimist here, that some designers, whether designing by ear or by meter, are doing a good job!
Opamps have always done a great job in the right hands.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
"Opamps have always done a great job in the right hands"
Not really. Of course the first opamps used tubes but I'm guessing that you are thinking of monolithic ones. The Fab. technology and design knowledge have grown tremendously since the start. I suppose the uA709 was the first common opamp but it wasn't really fast enough for great audio and I don't believe had thermal symmetry on the die. And of course the thermal feedback always reduces their open-loop gain (and hence GBW) even if the offset is under control when you try to drive much of a load.
But the designer's knowledge base and Fab. capabilities are now outstanding and it's not like tubes are lacking in performance and design issues. That's just the nature of engineering, you do the best you can with what you've got to work with in terms of cost, size, performance, delivery, power consumption, et al at any given time
Rick
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