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Valve amp: power is directly proportional to speaker Impedance therefore power increases as the speaker Impedance rises.Solid-state: power is inversely proportional to speaker Impedance therefore power decreases as the speaker Impedance rises.
Per Docere's comments, let's say a bit more here than just the normal "watt is a watt" which is true but not really the point. The circuit interaction with the speaker impedance is the reason the two sound differently. Super simple once you walk through the basics.Here is a nice discussion of the difference you are likely to hear between tubes and ss (related to how the "power" is used):http://education.lenardaudio.com/en/14_valve_amps_7.html
This has a lot more to do with how the two amps sound and how they perform, watt for watt. Not all SS are the same, either. The discussion of Class A vs A/B, etc is really important. Simplified to a high degree, splitting the signal/wave into two parts vs. leaving it a whole wave is the issue.
A/B or Push-Pull circuits are not as pure sounding as Class A. This seems to be a lot more important than the harmonics issue (even vs. odd harmonics when distorting) since the amp should be paired with speakers that allow headroom at 105 db.
But if you have headroom and you have linear components and you are simply choosing tube vs. ss, then Class A vs A/B is really important. Pass Labs/First Watt is based on this idea and is a good starting point for discussion.
SS is voltage based, tubes are current based.
Hi Mike,Are you shure this? I have seem many SS amp with lots of current as 40A in this Odyssey:http://www.odysseyaudio.com/products-khartago-stereo.htmlBut I have never seen a regular 10-20W tube amp with this current figure, just its tension are hi.
A triode applies nearly constant voltage across the load impedance.
Hi Guys,Been hearing that tube watts are more "powerful" than solid state watts. In fact...it happened last week...oh these speakers are fine with 25 watts tubed. However with solid state...double that. I should know this after so many years in the hobby...but I really still do not. Is this true? How does it translate sonically and on clipping issues?Thanks for your help.
Thank you, Steve, I have much to learn still (as ever). So do I take it that you are saying that the speaker and the amp, regardless of class type, need to be suited to each other based on the impedance requirements of both the amp and the speaker?
That would imply that there are at least tendencies of amp types and speaker types that should be known. And what are these tendencies? Class A vs A/B might have different tendencies on their own, right? Some might be more suited for a certain speaker type's tendencies.
Here is one for you. Tube type amps are known for flabby bass, but there are tube type amps that are tight in the bass, even without negative feedback applied. It is all in the amp design. Of course if the speaker is known for flabby bass (improper total Qts) not much can be done.
With all due respect I will disagree.W is just a mathematical calculation, its the result of Tension x Currrent.So different proportions of Voltage X Current can result in an Watt final.Example of different structures of a 30W figure:Amp X 10V x 3Amp=30WAmp Y 15V x 2Amp=30WAmp Z 7.5V x 4Amp=30WSo W is an imaginary power figure that does not exist in the electrical reality, what exists circulating in the amps circuits and loudspeakers are different amounts of voltage and current.Hope this help.
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