I have never seen non A R1 chip.
But I never seen a non A S1,too. And it seems to be real, in marantz cd 273 and cd 94. so might have some branch that we have not seen yet.
http://www.diyaudio.com/forums/digital-source/286722-tda1541-s-any-records-existing.html
But I never seen a non A S1,too. And it seems to be real, in marantz cd 273 and cd 94. so might have some branch that we have not seen yet.
http://www.diyaudio.com/forums/digital-source/286722-tda1541-s-any-records-existing.html
the danger would be not they are fake, but sorted out of the production because below the spec?
Old discussion ! It should be too expensive to make fake; if it works it's certainly genuine chip or genuine chip with a production default ! Wee need the knowledge of the old experts here
And also the latest taiwaneese TDA1541A would be on the same level than S2 but no marked S2 or double crown : same constant quality of production of the noemal level chip with the best spec ! Never had the chance to get a S2 nore to have a normal latest taiwaneese TDA1541A to check by myself but some did !
Old discussion ! It should be too expensive to make fake; if it works it's certainly genuine chip or genuine chip with a production default ! Wee need the knowledge of the old experts here
And also the latest taiwaneese TDA1541A would be on the same level than S2 but no marked S2 or double crown : same constant quality of production of the noemal level chip with the best spec ! Never had the chance to get a S2 nore to have a normal latest taiwaneese TDA1541A to check by myself but some did !
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The best is to have a fake to listen the "genuine" someone want to sell you ! Hoping there is not bader fake of fake 
That's terrible today all those designers who setup their DAC with false Philips chips !
What a pity there are no TDA1541A anymore at Rochester... but when I saw the price I paid for my two AD1862 chips + tax+customs, I'm not sure it's a problem !
Better to source an old CD player or steal the one of Grand'Ma!
That's terrible today all those designers who setup their DAC with false Philips chips !
What a pity there are no TDA1541A anymore at Rochester... but when I saw the price I paid for my two AD1862 chips + tax+customs, I'm not sure it's a problem !
Better to source an old CD player or steal the one of Grand'Ma!
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Hi niamex,
You can use a stereo jack with 2 channels + earth.
0.1mm would be fine, but you need low impedance for the earth lead or you might experience problems with hum.
The impedance of the signal wire is not that important as the current running through this wire is extremely low. By using a single 0.1mm signal wire, the interlink capacitance can also be kept low
I am now testing 15 x 0.1 mm insulated wires in parallel for earth and a single 0.15mm wire for the signal, all twisted together. Capacitance is comparable with conventional interlinks.
The single 0.1 mm signal wire is screened by the surrounding earth leads. I advise to use a different colour for this wire so you can pick it out easily after twisting the wires together.
In order to prevent breaking of the fragile 0.1 mm signal wire I folded it in a Z-shape at each end (within the plug) so when pulling the cable, all tesion is distributed to the point where the multiple earth leads are soldered to the plug.
You can use a stereo jack with 2 channels + earth.
0.1mm would be fine, but you need low impedance for the earth lead or you might experience problems with hum.
The impedance of the signal wire is not that important as the current running through this wire is extremely low. By using a single 0.1mm signal wire, the interlink capacitance can also be kept low
I am now testing 15 x 0.1 mm insulated wires in parallel for earth and a single 0.15mm wire for the signal, all twisted together. Capacitance is comparable with conventional interlinks.
The single 0.1 mm signal wire is screened by the surrounding earth leads. I advise to use a different colour for this wire so you can pick it out easily after twisting the wires together.
In order to prevent breaking of the fragile 0.1 mm signal wire I folded it in a Z-shape at each end (within the plug) so when pulling the cable, all tesion is distributed to the point where the multiple earth leads are soldered to the plug.
Thanks for your review Juanito!
I am surprised that the Mosaic T is still so dependent on the source, and on interconnects used. I was under the impression that John had deliberately chosen TOSlink connection etc. to eliminate exactly this.
Is the reason for this the jitter level of the input signal?
@John: Are you planning to further develop the 'input / reclocking stage', i.e. your passive clock concept etc., in a way that it becomes immune to jitter in the input signal, so find a cure WITHIN the Mosaic? Or would you say that the best advice for the time being, or generally, is to use an external device like the Mutec MC-3 to fix this OUTSIDE / IN FRONT OF the Mosaic?
BTW: That's why I loved your SD player, it put the source out of the equation, or rather included it, supplying your DAC concept with the best possible source quality. It seems to me that letting go of SD as source in favor of opening up to PC audio, USB, Airport, network players etc. (which is very understandable, and probably not a bad thing in terms of versatility, but not sure about signal quality) brought back a lot of problems and factors for deterioration.
I am surprised that the Mosaic T is still so dependent on the source, and on interconnects used. I was under the impression that John had deliberately chosen TOSlink connection etc. to eliminate exactly this.
Is the reason for this the jitter level of the input signal?
@John: Are you planning to further develop the 'input / reclocking stage', i.e. your passive clock concept etc., in a way that it becomes immune to jitter in the input signal, so find a cure WITHIN the Mosaic? Or would you say that the best advice for the time being, or generally, is to use an external device like the Mutec MC-3 to fix this OUTSIDE / IN FRONT OF the Mosaic?
BTW: That's why I loved your SD player, it put the source out of the equation, or rather included it, supplying your DAC concept with the best possible source quality. It seems to me that letting go of SD as source in favor of opening up to PC audio, USB, Airport, network players etc. (which is very understandable, and probably not a bad thing in terms of versatility, but not sure about signal quality) brought back a lot of problems and factors for deterioration.
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hi , the MC3 don't fix the jitter of the Mosaic it is just here to give the best Spdif output possible to the Mosaic dac , the Glass fiber too . i was first using the optical out of an airport express with plastic optical cable so garbage in garbage out with this dac. the Mutec MC3 is even a little overkill for the Mosaic but i have not tried others and i need a reclocker for my TV optical out with long plastic toslink cable .
i would prefer a BNC spdif input too but i'm not an engineer
as long i can remember the best listening sessions i had at my local shop long times ago was a Wadia 9 associated with a CEC TL0 Drive and Fiber glass ST optical cable not with Aesbu or cinch spdif ...
the fact that computer audiofools needs dedicated servers , usb regenerator / isolator reclocker etc.. is just because computer audio sucks transmitting bad power supply from the beginning to the end . i'm happy that the Mosaic don't fall in this category and can be isolated by the optical way .
i would prefer a BNC spdif input too but i'm not an engineer
as long i can remember the best listening sessions i had at my local shop long times ago was a Wadia 9 associated with a CEC TL0 Drive and Fiber glass ST optical cable not with Aesbu or cinch spdif ...
the fact that computer audiofools needs dedicated servers , usb regenerator / isolator reclocker etc.. is just because computer audio sucks transmitting bad power supply from the beginning to the end . i'm happy that the Mosaic don't fall in this category and can be isolated by the optical way .
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If it's not jitter (isn't that what a reclocker like the MC3 is there for...?), what kind of garbage is this you are mentioning? Assuming that the input to the Mosaic T was always bit perfect, there's not really anything else that can travel down the TOSlink connection to arrive at the Mosaic T, right? Or are there any digital artifacts or anything else in the signal?
the MC3 USB is just a USB/SPdif device with isolated usb and precise output clocking . the Aiport do the same task but not with the same result don't know if it is bit perfect or jitter but i'm sure there are many device that can output a Clean optical output too
but at the end for me it is the result that count i have listened a lot of expensives dacs in my life and i think this one is very unique and deserve to be heard.
but at the end for me it is the result that count i have listened a lot of expensives dacs in my life and i think this one is very unique and deserve to be heard.
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Hi John,
Thanks your comment and advice. Will try the same idea but seems quite sophisticated mechanical work
. Please share the impressions afterwords.Cheers,
Ignat
John,
Is the signal wire 0.15 or 0.1 - you are mentioning both - not a big difference but still. Different colour of a litz wire ?! - they are all the same.
May be my misunderstanding, please correct me.
Thanks,
Ignat
No chance, out of sight . I am lucky to have some 1995 with taiwan sign but that is not the same beer
Hi Bertel
There are no digital signals, only analogue signals that vary roughly between two voltage or current levels that are labelled “0” and “1”. We could also use 3 different voltage or current levels:
https://en.wikipedia.org/wiki/Ternary_computer
This means similar problems occur as with analogue signals, including jitter, ripple and distortion spectrum.
As soon as this “digital” signal enters the DAC, all connected circuits will be polluted by the interference spectrum that comes with the one’s and zero’s. So bit-perfect playback and low jitter are just few of many factors that can change the output spectrum and related sound quality of a DAC.
This is possible because there are no perfect components and no perfect circuits. Even a plain PCB trace has DC resistance, inductance, and capaciance. So it’s not even possible to make a perfect connection between component A and component B.
Therefore it is impossible to prevent source interference (jitter, ripple, harmonics) from reaching the DAC output.
I went to extremes to isolate source interference from Mosaic T DAC output as good as possible, given the imperfect parts.
Compare it with a luxury car with superb suspension system being driven over a bumby road, since no suspension system is perfect you will still feel the bumps. But when the same car is driven over a completely flat road it offers much more comfort compared to a car with a poor suspension system.
So even when using a high performance DAC, one still has to make sure to use a clean soure and an interlink that adds minimum distortion. So an XTOS or M3U with a multi-stranded real glass interlink ensures we have a cleaner input signal (comparable with a completely flat road).
Poor source with high jitter, ripple, interference, and a poor quality plastic fiber interlink could be compared with the bumby road. Performance will be accordingly, despite the high performance DAC.
High performance DACs also add less masking so it is now easier to hear flaws in source, interlinks and connected audio set. The advantage of less masking is that you can now hear things on a recording that were previously masked.
There are no digital signals, only analogue signals that vary roughly between two voltage or current levels that are labelled “0” and “1”. We could also use 3 different voltage or current levels:
https://en.wikipedia.org/wiki/Ternary_computer
This means similar problems occur as with analogue signals, including jitter, ripple and distortion spectrum.
As soon as this “digital” signal enters the DAC, all connected circuits will be polluted by the interference spectrum that comes with the one’s and zero’s. So bit-perfect playback and low jitter are just few of many factors that can change the output spectrum and related sound quality of a DAC.
This is possible because there are no perfect components and no perfect circuits. Even a plain PCB trace has DC resistance, inductance, and capaciance. So it’s not even possible to make a perfect connection between component A and component B.
Therefore it is impossible to prevent source interference (jitter, ripple, harmonics) from reaching the DAC output.
I went to extremes to isolate source interference from Mosaic T DAC output as good as possible, given the imperfect parts.
Compare it with a luxury car with superb suspension system being driven over a bumby road, since no suspension system is perfect you will still feel the bumps. But when the same car is driven over a completely flat road it offers much more comfort compared to a car with a poor suspension system.
So even when using a high performance DAC, one still has to make sure to use a clean soure and an interlink that adds minimum distortion. So an XTOS or M3U with a multi-stranded real glass interlink ensures we have a cleaner input signal (comparable with a completely flat road).
Poor source with high jitter, ripple, interference, and a poor quality plastic fiber interlink could be compared with the bumby road. Performance will be accordingly, despite the high performance DAC.
High performance DACs also add less masking so it is now easier to hear flaws in source, interlinks and connected audio set. The advantage of less masking is that you can now hear things on a recording that were previously masked.
