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Old 13th September 2009, 11:18 PM   #21
AKSA is offline AKSA  Australia
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Gaetan,

I will have a look, don't have the copy, read it at the newstand, but it was the month when the mag tested a rather expensive Chinese amplifier about a year ago.......

Anyone else see it?

Hugh
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Old 13th September 2009, 11:28 PM   #22
sandyK is offline sandyK  Australia
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Hugh
I vaguely remember what you were referring to, but I think it was more than a couple of years back.
SandyK
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Old 14th September 2009, 12:28 AM   #23
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well deservedthanks for sharing your knowledge and congratulation.
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Old 14th September 2009, 02:02 AM   #24
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Hello Hugh and sandyk

I have done a search on their web site, up to 2007, is it that article ?

http://www.siliconchip.com.au/cms/A_108021/article.html


I have also looked at others articles of that magazine and they seem to see thd measurements as "the way" to judge the quality of an audio gear.

Bye

Gaetan

Last edited by gaetan8888; 14th September 2009 at 02:20 AM.
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Old 14th September 2009, 02:23 AM   #25
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Hi Gaetan,

Many thanks, it's on track but not the one. Comments like these are very telling:

Quote:
So let’s flesh out this high-performance valve amplifier concept. First of all, let’s define high performance, in the valve context. If we do design a valve amplifier, it will need to deliver a total harmonic distortion of around 0.1%; or preferably .01%. That means we will be using negative feedback; in fact we will probably use "nested feedback" and lots of it, with a push-pull output stage. That concept will probably turn off more than half of the valve amplifier aficionados, since they have swallowed the nonsense from some hifi magazines that all feedback is anathema.
They indicate an overarching contempt for those who like tube amps, and further show just how he would design such an amp - along precisely the same lines he uses for SS amps, which is just not appropriate.

It is the very harmonic coloration of tubes which people enjoy, and which in the hands of a good designer can be manipulated to produce something truly musical and soulful. Using NFB to radically reduce this 'distortion' tends to reduce a tube amp to the level of a good SS amp, or at least one with very low single tone, measured THD. Leo's concept of 'straight wire with gain' is so far off the track as I understand it, specifically wrt tube amps, that to me it indicates an alarming ignorance of the facts.

Cheers,

Hugh
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Old 14th September 2009, 02:52 AM   #26
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Hello Hugh

I think I have it, it was in october 2005, he is quite corosive against valve amp. Maby he never listen to a good valve amp.

http://www.siliconchip.com.au/cms/A_105324/article.html

Quote:
It is quite another for someone listening to CDs to prefer the sound of a valve amplifier over modern solid-state hifi designs which DONíT suffer at all from high-order harmonic distortion.
Wooow, where does he read that "solid-state hifi designs DONíT suffer at all from high-order harmonic distortion" !!

Or I misunderstand his text or he his far from understanding thd measurements and distortions spectrum...

Bye

Gaetan

Last edited by gaetan8888; 14th September 2009 at 03:17 AM.
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Old 18th September 2009, 11:41 PM   #27
saf is offline saf
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Hello Hugh,

Just stopped by to say hello!
Good news the new forum....hope it will tripple the sales !

Best wishes,
Felipe
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Old 19th September 2009, 01:06 AM   #28
AKSA is offline AKSA  Australia
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Thanks Felipe,

I doubt it will triple sales, but it will certainly give me more visibility!

How's that slimline LF55 coming along? Have you managed to finish it? I bet it looks very nice, too!

Hugh
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Old 19th September 2009, 02:04 AM   #29
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Well I hope you make millions.
Then you might release some of your cirsuits to the diy community for use, just like Nelson.
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Old 19th September 2009, 03:19 AM   #30
AKSA is offline AKSA  Australia
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Aha, don't know about that, but yes, I would love to release some of my circuits, Than, but it is best to do it after they have exhausted the commercial life cycle, just as you say.

Cheers,

Hugh
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