Is this the utter lunacy it appears to be? Discuss... :)
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From: Lostgallifreyan on 12 Jul 2010 13:33 http://bursonaudio.com/burson_opamp.htm http://www.audioenz.co.nz/forums/archive/index.php/t-5625.html Don't ask me how I bumped into those while Googling for a few bits of info on audio op-amps, I just wish I hadn't, and want to spread the pain. >:)
From: Vladimir Vassilevsky on 12 Jul 2010 13:54 Lostgallifreyan wrote: > http://bursonaudio.com/burson_opamp.htm > http://www.audioenz.co.nz/forums/archive/index.php/t-5625.html > > Don't ask me how I bumped into those while Googling for a few bits of info on audio op-amps, I just wish I hadn't, and want to spread the pain. >:) 1. The AP THD meter has a floor of ~0.0008% THD for direct measurement. Hence all measurements in vicinity of 0.001% are going to be vastly inaccurate; unless with a special test setup using passive filters. 2. The state of the art is ~0.00005% THD in the audible band. They claim 0.001% which is really not any distinguished result. 3. Practicality: I am fine with 0.1% THD. However if somebody is willing to pay money for 0.0001%, I will be glad to provide them the opportunity. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
From: Vladimir Vassilevsky on 12 Jul 2010 13:54 Lostgallifreyan wrote: > http://bursonaudio.com/burson_opamp.htm > http://www.audioenz.co.nz/forums/archive/index.php/t-5625.html > > Don't ask me how I bumped into those while Googling for a few bits of info on audio op-amps, I just wish I hadn't, and want to spread the pain. >:) 1. The AP THD meter has a floor of ~0.0008% THD for direct measurement. Hence all measurements in vicinity of 0.001% are going to be vastly inaccurate; unless with a special test setup using passive filters. 2. The state of the art is ~0.00005% THD in the audible band. They claim 0.001% which is really not any distinguished result. 3. Practicality: I am fine with 0.1% THD. However if somebody is willing to pay money for 0.0001%, I will be glad to provide them the opportunity. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
From: Lostgallifreyan on 12 Jul 2010 15:19 Ian Bell <ruffrecords(a)yahoo.com> wrote in news:i1fp4i$6u7$1(a)localhost.localdomain: > Lostgallifreyan wrote: >> http://bursonaudio.com/burson_opamp.htm >> http://www.audioenz.co.nz/forums/archive/index.php/t-5625.html >> >> Don't ask me how I bumped into those while Googling for a few bits of >> info on audio op-amps, I just wish I hadn't, and want to spread the >> pain.>:) > > It's Patrick Turner in disguise, making a fast buck from the audiophools > so he can fund his tube work ;-) > I don't know who that is, but I notice they're in the same part of the world �^O Maybe they need a dose of Phil Allisons's methods of correction to stun them into a bit of technical rigour. He might be able to reach them better than most can. :)
From: Lostgallifreyan on 12 Jul 2010 15:55
George Herold <gherold(a)teachspin.com> wrote in news:f992e68a-dd73-43af-a809- babebf18dfe1(a)b35g2000yqi.googlegroups.com: > On Jul 12, 1:33�pm, Lostgallifreyan <no-...(a)nowhere.net> wrote: >> http://bursonaudio.com/burson_opamp.htmhttp://www.audioenz.co.nz/forums/a > rchive/index.php/t-5625.html >> >> Don't ask me how I bumped into those while Googling for a few bits of inf > o on >> audio op-amps, I just wish I hadn't, and want to spread the pain. >:) > > I'm reminded of looking for good low dissipation caps. I heard that > teflon were the best, but the only teflon caps I could find were used > by audio types. There was one or two sites that said for best > performance you had to condition the caps by feeding them Gaussian > white noise for one month before using them! > Nice. For these things I think I need to wire my brain into some kind of hypersensitive bridge and a centred analog meter movement with a scale that has 'Laugh' written on one end, and 'Cry' on the other. |