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Old 19th December 2003, 01:18 AM   #11
SY is offline SY  United States
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Nope, overload recovery. The difference they heard was in the bass where, presumably, the slew rates are pretty low.
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Old 19th December 2003, 01:39 AM   #12
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Hi,

Quote:
The difference they heard was in the bass where, presumably, the slew rates are pretty low.
Hmmm...very interesting. I don't think I have that particular issue of the A A.

Is it worth eleaborating on?

I'm all ears anyway,
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Old 19th December 2003, 03:16 AM   #13
SY is offline SY  United States
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Quote:
I'm all ears anyway,
That's a funny image.

I'll dig up the article tonight and post a specific reference and a precis.
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Old 19th December 2003, 06:06 AM   #14
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It is my opinion that a zero global feedback amp running at low level will sound identical with each of these schemes properly implemented
John

Have you actually tried this? I must assure you, even 40db bellow overload the differences are clearly audible. And besides, does anything ever sound identical?

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Old 19th December 2003, 06:43 AM   #15
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Peter,

Not all at the same time, I must admit.
I've done CR vs transformer though. These are as far apart as any in terms of topopogy.

Does anything ever sound identical? Well allowing for the occasional cosmic particle passing through my brain an affecting my perception, yes. But of course that entire sentence brings into doubt my absolute judgement
But then we were talking coupling, weren't we....
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Old 19th December 2003, 12:53 PM   #16
SY is offline SY  United States
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Frank, the article in question was Carlstrom, Krueger, and Greenhill, Audio Amateur 3/1982, p 30, "Some Amplifiers Do Sound Different." The amps they compared included an Audio Research D120, all running an Acoustat electrostat (5 ohms impedance, pretty flat). The amps measured fine on the bench, but in double-blind comparisons, they could identify the AR amp to better than a 0.05 significance.

They determined that the amps were being driven into clipping about 1% of the time, and that there was an overload recovery issue with the AR. It was most audible on a bass drum from an Eagles album, where they heard a distinct buzz. They couldn't distinguish the amps with symphonic material (unspecified what that album was).
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Old 19th December 2003, 03:24 PM   #17
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Hi,

Quote:
Frank, the article in question was Carlstrom, Krueger, and Greenhill, Audio Amateur 3/1982, p 30, "Some Amplifiers Do Sound Different."
Thank you, SY.

Cheers,
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Old 19th December 2003, 04:43 PM   #18
Raj1 is offline Raj1  United Kingdom
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Hi John,

Having read your posts, is it possible to assume that coupling with trannies may be a bit more linear than using choke and cr methods, especially when the amplifier is 'pushed'? I must admit though tubes definatley sound nicer than SS when pushed hard.

Thanks
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Old 19th December 2003, 05:28 PM   #19
dhaen is offline dhaen  Europe
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Yes.

But this only applies so positively to circuits with little or no feedback.
Not everyone will agree with this, but it tallys with my findings
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