John Curl's Blowtorch preamplifier part II - Page 3949 - diyAudio
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Old 18th May 2013, 04:30 PM   #39481
Bonsai is offline Bonsai  Taiwan
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Was that experience you had Scott with the O brand by any chance? The one the hifi press have been raving about for the last two years or so?
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Old 18th May 2013, 05:13 PM   #39482
1audio is offline 1audio  United States
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Quote:
Originally Posted by RNMarsh View Post
It's depressing me -- the more I look into it for myself.

Which brands/models use the Analog Devices ADC/DAC?


-Richard
Scott can probably provide more insight but I think ADI has effectively exited the premium audio ADC market. The current products are less focused on ultimate performance. The current serious players for ADC are AKM, Crystal, TI and a few boutique houses. None of the major players have released new stuff in the last 10 years it seems. From what I have been able to determine AKM has many of the pro and semipro sockets. The AKM 5394A is the best performing ADC I have found but I'm sure someone here will tell me why its no good.
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Old 18th May 2013, 05:27 PM   #39483
qusp is offline qusp  Australia
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PCM4222 is from 2006 and pretty decent, the ESS newer, but probably not by definition a 'major player'
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Old 18th May 2013, 05:48 PM   #39484
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Before this subject ends, I would like to say that many here have little idea or experience about hi end vinyl reproduction.
V15's and moderately expensive Grados just don't make the grade. Neither do record changers. No wonder you are put off by the very idea of vinyl reproduction. You can't resolve what the record 'ideally' has to offer, so to you, it is a waste of time.
Well, I'm glad that people are also finding fault with inexpensive D/A's too. Sometimes you guys act like the $100 player is all that anyone would need on this planet! '-)
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Old 18th May 2013, 05:49 PM   #39485
bcarso is offline bcarso  United States
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Originally Posted by bcarso View Post
I thought it was 6 times 8. Maybe that's on the BBC serialized version for television.

Oddly, recently, in cataloging books, I finally reached the box that had my copy of the jumbo Douglas Adams compilation, and brought it back to the apartment. I knew I had it but came close to getting another copy since it wasn't turning up.
Found it in the book and there, at least, is it 6 times 9.
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Old 18th May 2013, 05:58 PM   #39486
qusp is offline qusp  Australia
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Originally Posted by john curl View Post
Sometimes you guys act like the $100 player is all that anyone would need on this planet! '-)
nobody...ever....acts like that...ever

not even going to touch the rest of that post... par for the course

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Old 18th May 2013, 06:12 PM   #39487
bcarso is offline bcarso  United States
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Originally Posted by john curl View Post
Before this subject ends, I would like to say that many here have little idea or experience about hi end vinyl reproduction.
V15's and moderately expensive Grados just don't make the grade. Neither do record changers. No wonder you are put off by the very idea of vinyl reproduction. You can't resolve what the record 'ideally' has to offer, so to you, it is a waste of time.
I've heard some very fancy vinyl playback systems, multi-kilobuck MC cartridges, Forsell turntable, pricey big stepup transformer, tube preamps, custom room etc. Unfortunately the source material was in need of cleaning. But it sounded pretty nice, although not, to my ears, revelatory.

I tried to get the guy, Elliot Midwood, to deploy his washing equipment but he kept changing the subject. Perhaps he was conserving precious fluids, or the machine was broken.

The vinyl listening came after sighted A/B tests with digital material, and was by then more for pleasure.

The occasion was to demonstrate that a solid-state all-JFET buffer amp placed in the signal chain from preamp to the equalizer ahead of the power amp would be inaudible. I may have related the results: Elliot was impressed that it did appear transparent, as he was fairly well convinced that all solid state was bad news. However he said he might have heard a little less bass extension, and although I thought this unlikely it came to light that the input resistor at the buffer was a teensy bit smaller that the input resistance of the equalizer, so it was not a bad call. Indeed, I was very impressed with his acuity.

But --- of all the accessories that should be regarded as crucial for vinyl, right after the basic setup itself a record washer is I think the most essential. One of the nice things about the lower-bandwidth Shure was the brush on the stabilizer, which besides assisting the tracking of severely warped records did a bit of last-moment cleaning ahead of the stylus.

Last edited by bcarso; 18th May 2013 at 06:19 PM.
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Old 18th May 2013, 06:41 PM   #39488
morinix is offline morinix  United States
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After all this talk my lowly Shure v15 mk iv hopped up with a Jico SAS stylus does not want to go out in public anymore.
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Old 18th May 2013, 06:45 PM   #39489
SY is offline SY  United States
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As Bob pointed out here, and detailed extremely well in his recent Linear Audio article, the key to using high R high L cartridges is understanding their electrical loading requirements and accommodating it in the preamp design. If you do that, you can get excellent frequency response and overall performance- that's why cartridges like the V15 series have gotten such high praise from "independent" reviewers.

Of course, if your only design tool is high input C FET stages and you don't tailor your designs to accommodate these cartridges, you'll do better trying to convince people that cartridges like V15-V intrinsically have "low resolution" (whatever the hell that means) and sound "soft" and "smooth." Saves engineering work outside the designer's comfort zone and supports the high end marketing of his Team.

To be fair, I can also make the same cynical comment toward tube designers who use high mu triodes in the front end with a whopping Miller capacitance. Most 12AX7 stages that I've seen are particularly bad in this respect.
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Old 18th May 2013, 06:54 PM   #39490
bcarso is offline bcarso  United States
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Speaking btw about bass extension, read the review and measurements of the $42,000 TAD C600 line-level preamp in the latest Stereophile (June 2013). JA finds the low-frequency -3dBr point mighty high when driving the admittedly unrealistic 600 ohm load. I'd conjecture we'd pop the hood to find a very expensive but rather undersized output coupling capacitor. But what do you want for a mere 42k? And, it has gain! All of 12dB.

The noise reported is low but not strikingly so.
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