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Author Topic: Modeled amplifier tone  (Read 12933 times)

Offline Andi

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Modeled amplifier tone
« Reply #105 on: August 02, 2007, 07:41:25 AM »
quote:
Originally posted by rt0412

The RMS power output rating of ANY amp is usually based on UNDISTORTED sine wave output.


You'd hope so, but I strongly suspect that your average SS amp is quoted at 5-10% THD to massage the figures, and your average tube amp is quoted at more like 1%. And what frequency? I honestly don't think that any serious testing is done to establish the output power.

quote:
My take on the SS amp is that it becomes unusable past the clipping point because of it's harsh distortion, so it stops at the 100W level. However, the tube amp can go quite a bit further - at that point the output waveform is a SOFTLY CLIPPED sine wave (still pleasing to the ears) which has a higher energy content compared to that of a pure sine wave. At this point, the tube amp will be putting out more than it's undistorted sine wave output rating and will definitely sound louder.


Yup. I would tend to agree (assuming that the tube amp user likes and wants power tube saturation).

But comparing wattage between amps seems to me to be a futile exercise; thus any claim that "valve watts" are louder than "ss watts" is ridiculous. Particularly given the enormous influence of the speaker sensitivity.
 

Modeled amplifier tone

Offline Andi

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Modeled amplifier tone
« Reply #106 on: August 02, 2007, 02:54:38 PM »
As promised/threatened, here's the link to the article I was talking about. There's some good stuff in there - bear in mind it's from a company that makes high end solid-state amps when you read it, but it's pretty sound.

http://www.award-session.com/pdfs/GEAR_TALK_1.pdf