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In Reply to: RE: I'm with Andy......"tube sound" equals something wrong posted by Russ57 on December 16, 2015 at 18:25:27
Russ,
Interesting; but somewhat off the question I asked.
However, I do have some background with pro gear, and once built an active biamped stage system for a keyboardist. It was inspired by the EV S18-3; but voiced for a nicer vocal sound, as he sang along with his keyboards and when playing out alone, couldn't run his vocal mike through the band's system. It was over 100 dB/w sensitivity, and driven by a 200 W/ch stereo amp. But there's no chance to use anything like that in my 12' x 15' den in my condo where the phone rings if I crank it up even a little bit.
Jerry
Follow Ups:
First off, there is no doubt there have been advances in caps over the years. Also no doubt that all amps are built to a price point. So I have no problem buying an improvment in your amp from some cap tweaking. I too have heard the same. I started in this same forum doing the same things.
Still, at the end of the day, it strikes me like asking if amps built on NPN transistors are more "tubey sounding" than amps built on PNP transistors. In short I think you are asking the wrong questions about the wrong things.
For example why should a bi-polar transistor sound different than a FET or pentode or tetrode or triode? Could it be the active device or the circuit topology of the day when such devices were prevelant? And if, as a designer, you were free to use a device that developed greater output wattage, would you then be more inclined to use greater levels of negative feedback? I mean why wouldn't you? Less distortion, lower output impedance, etc. Seems a win/win. Yet we now know there is a difference between odd and even order distortion and how our ears react.
It all makes it hard to compare. Some like apples and some like oranges. More to the point might be that some speakers "require" apples while some do better with oranges.....and some might be fine with either.
From an engineering/electrical point what can you "guess" the added bypas caps could be doing to cause what you are hearing? An increase in the bandwith of the decoulping of the power supply? A reduction of high order ripple voltage?
Experiments are great. You heard what you heard. Now a theroy must come from it. Then you must duplicate the results. There is much work to be done and you can't use only your ears. If test equipment says it is worse it is.
To date nothing has measured as bad as speakers for me. Try recording what comes out of speakers and feeding it back into the amp. After a few generations it is pitiful. Square waves are widely used to measure an amp. Darn few speakers can reproduce one.
Some day I would like to hear a transformer coupled DHT amp driving high efficiency speakers. They way things are, I'd probably have to build it myself to hear it!
Dave
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