Will
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Post by Will on Mar 23, 2009 18:48:11 GMT
Come YP53, let us know who you are, it's pretty obvious your a visitor here!
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Post by andyhay on Mar 23, 2009 19:29:38 GMT
If I`d bought mine from him, I think I`d probably be taking him up on his guarentee. I`ve listened to it for a couple of hours and the 2132 is a step up. I do like my music on the warm side, and the 49720ha left me cold. Maybe it requires the JLH, but the only +ve is, it halved my already tiny DC offset. Back to the 2132 methinks. AndyH.
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Post by traf on Mar 23, 2009 19:44:32 GMT
cheez and I have some more to get rid of interesting the chap also uses it in an "SCHA" and the chap likes my perf board lead forming technique ;D it's a wonder there wasn't a link to rockgrotto for more details Robert OK for the record yp53 = traf = me If I'd wanted to stir up a mini hornets nest I would have posted an ad in the 'for sale' section here, but didn't to avoid interferring with the Group Buy. (This is also why there is no link to RG in the ebay ad) So sorry Robert if you've still got stock to shift - I hope everyone who signed up has taken up their allocation and you haven't got too many left. Also note how many have sold so far (2) - hence the 'money back guarantee' bit to get things moving a bit and spread the word. simon
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Deleted
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Post by Deleted on Mar 23, 2009 20:01:19 GMT
If I`d bought mine from him, I think I`d probably be taking him up on his guarentee. I`ve listened to it for a couple of hours and the 2132 is a step up. I do like my music on the warm side, and the 49720ha left me cold. Maybe it requires the JLH, but the only +ve is, it halved my already tiny DC offset. Back to the 2132 methinks. AndyH. Andy Mike has already stated that the LM4562 didn't really shine until after the JLH was fitted. It is much fussier of a good power supply. Robert has also been able to make it sing with his mods. Incidentally, while testing Nick's build, I used an OPA2134 as a "sacrificial" I.C. It also improved considerably after the JLH was in line. I would suggest that the majority of simple I.C. based designs do not have an adequate PSU to show them at their best. See also: rockgrotto.proboards39.com/index.cgi?board=chitchat&action=display&thread=3621&page=32Mike's reply 473 Alex
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Post by andyhay on Mar 23, 2009 21:21:39 GMT
Alex,
I`ll bow to your testimony. The JLH it is then. I must concede, I`ve skipped over most of the JLH postings, so I wonder if you could enlighten me.
Has a final JLH BOM been posted ? ...or is it still WIP ? Are there any Gerber files available ? Is a schematic available ? Anyone tried to compress the footprint ?
AndyH.
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Deleted
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Post by Deleted on Mar 23, 2009 21:30:17 GMT
Alex, I`ll bow to your testimony. The JLH it is then. I must concede, I`ve skipped over most of the JLH postings, so I wonder if you could enlighten me. Has a final JLH BOM been posted ? ...or is it still WIP ? Are there any Gerber files available ? Is a schematic available ? Anyone tried to compress the footprint ? AndyH. Andy Have a look in Silicon Chip Headphone Amp Tweaks. rockgrotto.proboards39.com/index.cgi?board=chitchat&action=display&thread=3622&page=1Gerber files are not available. That would make things easy , wouldn't it? A couple of U.K. members are currently collaborating on making a smaller footprint JLH, perhaps using a few vertically mounted resistors to conserve space? There may be boards available soon, if all goes to plan. Send Jon Clancy a PM and he may be able to tell you more.As well, he needs expressions of interest to let him know whether it is all worthwhile.. Alex P.S. I will email you a copy of the original article.
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Post by PinkFloyd on Mar 23, 2009 21:30:27 GMT
Oh well, that's my metal can installed: Not quite sure what to make of it as yet, it's certainly smooth and polished but taking a bit of time to re-adjust to the sound after the GDaudio Sun module which, IMO, is a bit more organic sounding.... I'll let the can burn in for a couple of days and see how it sounds then. The T05 heatsinks are pretty much a perfect fit and seem to do the job very nicely.... I found my stash of them and if anybody would like one I'll send free of charge, just pay the postage and packing - if interested please PM me.
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Deleted
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Post by Deleted on Mar 23, 2009 21:44:02 GMT
Mike Are R1 and R4 (gain setting resistors) mounted under the PCB ? Alex
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Deleted
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Post by Deleted on Mar 24, 2009 1:44:25 GMT
Miguel How much excess do you have to pay with your car insurance policy ? Alex
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insomniac
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Post by insomniac on Mar 24, 2009 2:07:03 GMT
Oh well, that's my metal can installed: Not quite sure what to make of it as yet, it's certainly smooth and polished but taking a bit of time to re-adjust to the sound after the GDaudio Sun module which, IMO, is a bit more organic sounding.... I'll let the can burn in for a couple of days and see how it sounds then. The T05 heatsinks are pretty much a perfect fit and seem to do the job very nicely.... I found my stash of them and if anybody would like one I'll send free of charge, just pay the postage and packing - if interested please PM me. The Jury's still out on the LM4562HA as far as I'm concerned. Sure it's got a lot of the desirable qualities we search for in an op-amp... wide soundstage, airy presentation, accuracy but for me it is lacking in one major area.... "involvement". I won't write the chip off as it may prove useful for monitoring while mixing but for just enjoying music it would be far from my first choice.
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Deleted
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Post by Deleted on Mar 24, 2009 2:20:49 GMT
Dave What are you using it in ? Remember too, that this chip is VERY fussy about it's power supply. It can sound too detailed and fatigueing with an average PSU. Robert has also taken a lot of extra care in bypassing with his version of the SC HA to get the best out of it. (added tantalum capacitors) Alex
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insomniac
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Post by insomniac on Mar 24, 2009 2:45:12 GMT
Dave What are you using it in ? Remember too, that this chip is VERY fussy about it's power supply. It can sound too detailed and fatigueing with an average PSU. Robert has also taken a lot of extra care in bypassing with his version of the SC HA to get the best out of it. (added tantalum capacitors) Alex Alex It was in the Yulong DAH1 since arrival but has been removed in favour of OPA Earth. The DAH1's PSU is pretty decent and the layout has worked fine with all previous op-amps and discrete modules I have tried. Maybe not the most hi-end amp to test the LM in but as I know the sound of the DAH1 I find it is a good testbed in which these differences can be easily spotted. Also when testing with some electronic music I found the euphoric feeling often associated with this style of music just wasn't present.... no rush factor. All this is of course just my opinion and my findings on this occasion and I know many members, yourself included, enjoy the LM4562 sound. I will test the chip further in different set-ups over the next couple of months paying close attention to the PSU quality and bypassing where required. Dave
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Deleted
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Post by Deleted on Mar 24, 2009 2:55:28 GMT
Dave BTW, I tried the LM4562 in the SC Studio Series Preamp's main amplification, (The SC HA is part of this) and I went back to the OPA2134 at that location. Alex
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Post by Deleted on Mar 24, 2009 8:51:16 GMT
2 days after install ( permanently playing ) & 701s plugged in... This is the first time I've heard tuneful, solid, tight bass through my headphones. A facet of sound quality I take for granted from my 'speakers. I've yet to try a wider range of music ( that will test other areas ), but so far impressions are good. (Also SCHA put back together with only LM changed, several other mods still outstanding)
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Deleted
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Post by Deleted on Mar 24, 2009 9:03:55 GMT
Chris I gather that this is with a JLH in line ? That was one of the 1st things I noticed after putting a JLH in line in this HA. Incidentally, Geoff, a friend had a minor problem with a preamp I had built around 15 years or so back. As it turned out, he hadn't realised that the switch next to the headphone jack was for switching between headphones and line out using a delay circuit, and was in the headphone position. What surprised me most though, was to find that I had installed an earlier version of the JLH, all those years ago.I had forgotten about it ! Alex
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Post by PinkFloyd on Mar 24, 2009 11:28:04 GMT
Mike Are R1 and R4 (gain setting resistors) mounted under the PCB ? Alex For some peculiar reason, YES, they are
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Post by PinkFloyd on Mar 24, 2009 11:35:48 GMT
The Jury's still out on the LM4562HA as far as I'm concerned. Sure it's got a lot of the desirable qualities we search for in an op-amp... wide soundstage, airy presentation, accuracy but for me it is lacking in one major area.... "involvement". I have always said the LM4562 (and the LM6171) lack one thing and that is "soul"..... you call it "involvement" Dave, I suppose you and I are talking about the same thing. There's bones, there's meat, there's a heart and there's blood but there's no emotion, no laughter, no tears..... pretty much a zombie of a chip, sterile, precise as a swiss watch and technically perfect but emotionally dead.... A nice enough listen nonetheless but I do prefer my music with a bit more emotion and life.
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Deleted
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Post by Deleted on Mar 24, 2009 18:02:08 GMT
I gather that this is with a JLH in line ? Alex Oh yes, no doubting the value of that.
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Post by Deleted on Mar 24, 2009 22:34:48 GMT
Miguel How much excess do you have to pay with your car insurance policy ? Alex What do you mean by EXCESS? Do you by any chance mean deductible? That is the amount I have to pay out of my pocket before the insurance company starts to pay out? If so $500 USD. Miguel That is what we call "EXCESS" . If I remember correctly, my excess was AU$400, although it may have changed recently. Alex
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Post by jphoward on Mar 25, 2009 12:02:33 GMT
Mine arrived today, thanks Robert. I'll suspend judgement until after I've got my JLH, and burn-in. However, one interesting observation was that before (with standard LM4562) I had 1.8mV at my outputs, and with the LM4562HA I have only 0.2mV.
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robertkd
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Electronics Engineer from sunny Queensland
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Post by robertkd on Mar 25, 2009 12:15:14 GMT
Mine arrived today, thanks Robert. I'll suspend judgement until after I've got my JLH, and burn-in. However, one interesting observation was that before (with standard LM4562) I had 1.8mV at my outputs, and with the LM4562HA I have only 0.2mV. Jeremy Glad to see they found there way to their new home Surprising although I would suspect that you might find they also have a slightly different sonic quality even with out a JLH. have you been able to follow my mods? Robert
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insomniac
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Post by insomniac on Mar 25, 2009 20:31:01 GMT
The Jury's still out on the LM4562HA as far as I'm concerned. Sure it's got a lot of the desirable qualities we search for in an op-amp... wide soundstage, airy presentation, accuracy but for me it is lacking in one major area.... "involvement". I have always said the LM4562 (and the LM6171) lack one thing and that is "soul"..... you call it "involvement" Dave, I suppose you and I are talking about the same thing. There's bones, there's meat, there's a heart and there's blood but there's no emotion, no laughter, no tears..... pretty much a zombie of a chip, sterile, precise as a swiss watch and technically perfect but emotionally dead.... A nice enough listen nonetheless but I do prefer my music with a bit more emotion and life. Yes I think "soul" is probably a better description Mike... I still can't put my finger on it but feel there is also something about the midrange that just isn't what I'm used to. At first listen the bass was lacking but this has now improved somewhat but the mids feel toned down or slightly recessed. I have yet to try the LM in a DAC to see how it sounds there but will get round to it soon.
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Post by jphoward on Mar 25, 2009 22:13:29 GMT
have you been able to follow my mods? No - the posts I've found assume a much higher level of competence than I have... Can you describe in layman's terms what the most important changes are? Are your mods and Alex's mutually exclusive? (I've already done all Alex's mods listed in the tweaks thread, except for the JLH).
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Post by PinkFloyd on Mar 25, 2009 22:44:10 GMT
I have always said the LM4562 (and the LM6171) lack one thing and that is "soul"..... you call it "involvement" Dave, I suppose you and I are talking about the same thing. There's bones, there's meat, there's a heart and there's blood but there's no emotion, no laughter, no tears..... pretty much a zombie of a chip, sterile, precise as a swiss watch and technically perfect but emotionally dead.... A nice enough listen nonetheless but I do prefer my music with a bit more emotion and life. Yes I think "soul" is probably a better description Mike... I still can't put my finger on it but feel there is also something about the midrange that just isn't what I'm used to. At first listen the bass was lacking but this has now improved somewhat but the mids feel toned down or slightly recessed. I have yet to try the LM in a DAC to see how it sounds there but will get round to it soon. To me the mids are artificial, female voices sound like they've been processed, there's no "spit and moisture" it's all dry and uninvolving.... I think we are both batting on the same wicket on this one Dave...... I'm sure the LM4562 has a place somewhere in an audio application but, to my ears, it's not the best you can do in the SCHA (far from it)..... I much rather the Burr Brown / AD house sound (AD = organic / BB = velvety smooth) and my chip of choice at the moment is none other than the Audio GD Earth.... it simply conveys the music / emotion naturally.
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Deleted
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Post by Deleted on Mar 25, 2009 22:52:11 GMT
Jeremy It would be best to stick with one version or the other. Both versions are tweaked to have an accurate as possible sound quality. Making changes to either version is likely to affect the tonal balance. e.g. adding the JLH to the PCBs that I have already modified, will give a marked improvement. Adding a JLH to Robert's version may give an entirely different result, due to the use of PSU feed chokes, and added opamp decoupling. Many people do not seem to realise that with today's higher speed opamps, that the PSU input pins of the I.C. are actually regarded as INPUTS, and as such, are very sensitive to the PSU used,it's components,such as value and type of filter capacitors, voltage regulator output capacitors,the type and location of opamp bypassing capacitors, track inductance, and many other variables. All these have a large effect on the perceived sound quality, and accentuation OR attenuation of parts of the audio spectrum. Alex
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