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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: RE: "Remember the negative correlation..." posted by morricab on August 14, 2008 at 02:44:38:
"if you had only amplifiers without negative feedback I bet it {THD} would again have a meaningful correlation with sound quality"
I bet you are right. Traditional tools to treat traditional troubles.
Feedback isn't the only source of coupling from the output to earlier stages. Devices, including tubes are not actually unilateral and the power supply system provided yet another route as do strays in general.
"General engineering practice" evolves. Take a bunch of people from the tube days and make them start using transistors, which were themselves crude, unreliable and unpredictable in their early years as were tubes in theirs and you have problems. It was a major transition and a lot of guys just plain quit. Many of them told me that they hated transistors, that it wasn't what they signed up to do, that they were "too old for this crap" and would rather be sheep farmers. There was a similar, but smaller wave of departures when IC's started to come to the fore. "Except for semiconductor designers, the day of the design engineer is over." And look how it all shook out, why some people even still use tubes...
But back to your point, it takes a lot of time and usage to figure out the subtleties of a technology and about the time you do, it becomes obsolete. The arrival of class D amplifiers probably bodes well for the final 'perfection' of linear solid state ones.
Speaking of class D amps, I've never heard one. However there you have a scheme that has a basically linear transfer function without feedback as most device make better switches than amplifiers. I suspect tube guys will migrate to them and some of us will cling to our transistors saying "there's just nothing like the grungy sound of a classic 2N3055".
Rick
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Follow Ups
- RE: "Remember the negative correlation..." - rick_m 08/14/0808:47:45 08/14/08 (2)
- RE: "Remember the negative correlation..." - morricab 00:56:14 08/15/08 (1)
- RE: "Remember the negative correlation..." - rick_m 09:40:05 08/15/08 (0)
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