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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 18th July 2017, 01:02 AM   #94031
billshurv is online now billshurv  United Kingdom
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John Curl's Blowtorch preamplifier part II
The AES article I linked possibly has that. We just need a tame AES member to check!
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Old 18th July 2017, 01:33 AM   #94032
DPH is offline DPH  United States
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Originally Posted by billshurv View Post
I don't recall Pavel or Daniel posting scores so didn't account for them. Apologies to both of them if they did.
I wrote that I didn't vote simply because after doing a cursory listen, there wasn't anything jumping out. I also didn't want to confer that I couldn't hear any difference, so I recused myself there as well. I also would like to be clear that I *don't* pretend to have good hearing.

And that Mark's behavior amuses me to no small end.
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Old 18th July 2017, 03:51 AM   #94033
1audio is online now 1audio  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by billshurv View Post
The AES article I linked possibly has that. We just need a tame AES member to check!
I DL'd the article. Its really light on most details. Key takeaway was that the most unobtrusive removal was to just "zero" the signal during the event. Its not long and doesn't have a lot of really serious research into identification of 'clicks" etc. probably to protect what IP he had with it. he also says: "An electronic circuit which can reliably utilize all the clues in the program content long before and long after the tick becomes unduly complex and expensive. In the system to be described real time detection occurs based on the very low duty factor of noise impulses as compared with the high frequency content of the program." Today with DSP power what was unduly complex is not.

If you want a copy PM me.
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Old 18th July 2017, 04:50 AM   #94034
john curl is offline john curl  United States
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Richard Burwen is a very competent design engineer who first got Mark Levinson on the path to hi end audio. I think he was one of the founders of Analog Devices, before IC's became practical. His audio equalizer is considered one of the best in the business, and his transient suppressor is probably very competent in design and detail. Unfortunately, he cannot hear differences between most op amps, so he uses them profusely in his designs. This has been true since the early '70's. I may disagree with him in design approach, but I find it unprofessional to criticize his efforts, without real cause. Most here can't compare to him as a design engineer.
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Old 18th July 2017, 05:15 AM   #94035
RNMarsh is offline RNMarsh  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by scott wurcer View Post
I'm shocked actual lying, what's the world coming to?
isn't he related to The Don? Trump? That would explain it.
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Old 18th July 2017, 06:13 AM   #94036
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After all, there are only a few sota DAC IC around and so many companies can use it with a characteristic effect/sound. To differentiate would be what you can do all around it. level control (analog/digital etc), parts selection, opamp type and config, power supplies and filter algor etc.
Or make up a story and talk through your hat. Much more productive than anything else, the Bentley owners will buy it.
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Old 18th July 2017, 07:13 AM   #94037
jan.didden is online now jan.didden  Europe
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Originally Posted by john curl View Post
Jan, the waveform shown is not TIM30, but it is a DIFFERENTIATED (by using a passive inverse RIAA box (Jung, Lipshitz) and further rolled of by a 6dB/oct 30KHz filter. If I showed the TIM30 waveform, it would resemble a 10us rise-time, 3.18KHz square wave. The TIM(30,30) waveform is much faster than that.
Please Note that in Graph 1, I used an even slower test waveform TIM(15,10) in some measurements to be closer to a typical moving magnet cartridge.
Ahhh yes, I see. Thanks.

Jan
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Old 18th July 2017, 08:11 AM   #94038
RNMarsh is offline RNMarsh  United States
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John Curl's Blowtorch preamplifier part II
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Or make up a story and talk through your hat. Much more productive than anything else, the Bentley owners will buy it.
Or the Lambo. Both cars are all story and talking thru their hat. They really do not perform better than lesser cars. Not worth the price therefore. I have a nice hardly used DAC2 - you will love it. Cheap enough just for you.



THx-RNMarsh

Last edited by RNMarsh; 18th July 2017 at 08:14 AM.
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Old 18th July 2017, 08:55 AM   #94039
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Your amps do ADC-DSP-DAC, don't they Marsh?
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Old 18th July 2017, 09:00 AM   #94040
billshurv is online now billshurv  United Kingdom
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John Curl's Blowtorch preamplifier part II
Demian: Thanks, but right now I'll have no time to give it justice. I should also get off my posterior and do some measurements. Whilst I'm not about to take a hacksaw to a record as B&K did I have plenty of second hand vinyl with scratches on and, whilst I can't prove anything to AES levels I can certainly give myself confidence.

Scott: You not liking the sound of something! I thought that was reserved for horns ?
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