Re: apparent leanness of LM6172 (see Ehien)

Posted by NormanCdn (A) on February 8, 2002 at 06:45:24

To quote Ehien: "At the moment I have LM6172 in my phono stage for auditioning. It is indeed a very fine opamp with superb specs. But the perspective into sonic texture is very different than the ones (OPA2604, OPA2134, OPA637) from BB/TI. LM6172 has great clarity and resolution, but the tonal balance, compared to OPA's is on the leaner side. For me LM6172 is more like what a good solid-state (YBA comes to mind) sounds; while OPA's are more like what a good tube amp sounds. With one exception that bass seems to be a bit weak on LM6172."

My comparisons of the LM6172 with OPA2604 and OPA2134 in entirely different conexts gives the same impression BUT there is not very much likelihood that what we are hearing is in fact literally a treble boost. The chip just can't be that non-linear as a function of frequency. It must be something else? Better transient response (well, that's not such an easy answer either, as the ability to deal with a sharp wavefront is also a partial function of high frequency response...).

I am not where my test equipment is, so can't give this a rigorous test. I do recall scoping the loaded output of a Rotel RCD791 with LM6172 in the analogue stages, using a test CD. Result: dead flat sine wave output from the lowest track to the highest. Voltage variance was on the order of millivolts.

So what's up here?

Norman

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Topic - Re: apparent leanness of LM6172 (see Ehien) - NormanCdn 06:45:24 02/08/02 (21)

Re: apparent leanness of LM6172 (see Ehien) - Ehien 16:50:15 02/08/02 (0)

Re: apparent leanness of LM6172 (see Ehien) - Spartacus 07:53:28 02/08/02 (1)

Re: apparent leanness of LM6172 (see Ehien) - Norman(Cdn) 08:10:42 02/08/02 (0)

Re: apparent leanness of LM6172 (see Ehien) - puppyslugg 22:36:54 02/27/02 (0)

Re: apparent leanness of LM6172 (see Ehien) - Thorsten 07:36:08 02/08/02 (17)

Re: apparent leanness of LM6172 (see Ehien) - tropiclcb 17:15:39 02/08/02 (4)

Re: apparent leanness of LM6172 (see Ehien) - Thorsten 03:55:57 02/09/02 (3)

Re: apparent leanness of LM6172 (see Ehien) - rwiley 11:48:10 02/22/02 (0)

Re: apparent leanness of LM6172 (see Ehien) - rwiley 09:05:43 02/22/02 (0)

BlackGates? - Sasha 06:27:04 02/12/02 (0)

PSRR of 6172 - Ehien 16:58:41 02/08/02 (10)

Re: PSRR of 6172 - eagle1 06:53:29 02/09/02 (8)

Zerodistortion, LM6172 and not reading App Notes.... - Thorsten 07:55:03 02/09/02 (7)

Re: Zerodistortion, LM6172 and not reading App Notes.... - rwiley 20:47:26 02/24/02 (0)

Re: Zerodistortion, LM6172 and not reading App Notes.... - dekbearder 16:18:14 02/09/02 (2)

Re: Zerodistortion, LM6172 and not reading App Notes.... - Thorsten 04:06:07 02/10/02 (1)

Re: Zerodistortion, LM6172 and not reading App Notes.... - dekbearder 11:42:45 02/11/02 (0)

Re: Zerodistortion, LM6172 and not reading App Notes.... - eagle1 09:10:56 02/09/02 (2)

Siemns Stacked Film Cap's - Thorsten 11:41:01 02/09/02 (1)

Thanks T! Will try to put my hands on these yummies! NT - eagle1 12:29:34 02/09/02 (0)

Re: PSRR of 6172 - Thorsten 04:01:12 02/09/02 (0)

Re: apparent leanness of LM6172 (see Ehien) - NormanCdn 08:13:01 02/08/02 (0)

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