Bernhard said:
It is the fact, the 1543 is :bs:
The low cost version of the 1541.
TDA1545 is more or less the low cost version of the TDA1541. AFAIK it has more resemblance technically.
Regarding your measurements. Could it be that 20+ year old used chips are simply EOL ? If chips differ that much the gear would not have met the manufacturers specs would it ?
jean-paul said:
Don't think so,
usually in the data sheets they claim around -35dB to -45dB guaranteed without MSB adjust.
The lucky ones ( one out of ten to twenty ) with or without MSB adjust are better -60dB.
I also found a good PCM54.
Dead chips show increased noise, increased or decreased output current and real bad linearity.
Mmm, I was thinking of TDA1540 when I wrote my post. That one really deteriorates with age.
Do you hear the difference between a chip with -35 dB and one with lets say -55 dB ?
Do you hear the difference between a chip with -35 dB and one with lets say -55 dB ?
How do you measure these values? Is there a seller who is willing to measure the 1543 and make sure they meet manufactures specs?
Which Chip is not Dire?
OK rfbrw,
Let's assume the TDA1543 is dire. Then which chip do you advice?
I already tried TDA1541S1, AD1865K, AD1851, PCM56, TDA1545, TDA1543; all NON-OS "of course".....
😉
rfbrw said:
OK rfbrw,
Let's assume the TDA1543 is dire. Then which chip do you advice?
I already tried TDA1541S1, AD1865K, AD1851, PCM56, TDA1545, TDA1543; all NON-OS "of course".....
😉
Ulas said:
Yes, I've had the same traces. Some remarks:
- with a tube output and a speaker that is not finicke (doesn't dislike) suprasonics, there is no problem in the sound.
The 1543 needs to be tailored in Vref very specifically to get the full 0dB on the given output load and the Vsupply.
In my experience, Ulas, the 'bad' trace has to do with too little headroom goiven the combination of Vref and Vsupply plus the Rout. So try to adjust these, it MIGHT have to do with individual chips.
The traces and the blocks don't say everything. I did the following trick: synchronizing with an external generator that I could run at 44kH, 88kHz, etc; and then at some frequency (if I recollect correctly) at some 220 kHz (ie 5x the beat frequency) I got a single trace on the scope; not the stacked blocks that result from juxtaposition of individual traces. Then you can see what the I/V is really doing - it gives off a very pure signal! But of course in steps. There is nothing to do about that exept add a low-pass filter. Or add a output transformer that really acts as a LPF.
Yes, when OS-sing the signal (like passing it through the 7220) then we get a pure signal; but that also means that a specific kind of dynamics is lost.
Now on the 'coarse sound': yes, it's raw. But: I visited a musical and took away the corresponding CD - only the NonOS gave the same experience as the original theatre when I played at full level . You can go really load with this design!
So, if you have those $500 tweeters eager to pick up any detail, it is a hard way to go. If you have an English sound (ESL, KEF) then it should be just marvelous imho.
albert
Re: Which Chip is not Dire?
I would never advise anyone to go down any particular route. I tried non-os but I'm much better now.
Elso Kwak said:
I would never advise anyone to go down any particular route. I tried non-os but I'm much better now.
Re: Re: Which Chip is not Dire?
Hahahaha yor post is an oximoron as you discourage the NON-OS route.
BTW "oxi" means no in Greek and a moron is a .......... MORON? (Mormom?)
rfbrw said:
Hahahaha yor post is an oximoron as you discourage the NON-OS route.
BTW "oxi" means no in Greek and a moron is a .......... MORON? (Mormom?)
Ulas
in the first post you mentioned
"An additional annoyance is the DAC-AH emits a constant squeal all by itself without being plugged into an amplifier."
maybe there is a problem other than the dac being used?
did you find the problem before measuring or did you just wanted to play with your new toy?
toy (scope not dac)
allan
in the first post you mentioned
"An additional annoyance is the DAC-AH emits a constant squeal all by itself without being plugged into an amplifier."
maybe there is a problem other than the dac being used?
did you find the problem before measuring or did you just wanted to play with your new toy?
toy (scope not dac)
allan
Re: Re: Re: Which Chip is not Dire?
For that to be the case one would have to hold two mutually incompatible positions as in a square circle.I do not.
While is indeed correct that I find non os displeasing, I consider that a personal dispositon like my intense dislike of beetroot and as such feel no need to discourage others.I have in past assisted those who wish to go down that route.
The derivation is oxy=sharp moros=dull
Elso Kwak said:
Hahahaha yor post is an oximoron as you discourage the NON-OS route.
BTW "oxi" means no in Greek and a moron is a .......... MORON? (Mormom?)
For that to be the case one would have to hold two mutually incompatible positions as in a square circle.I do not.
While is indeed correct that I find non os displeasing, I consider that a personal dispositon like my intense dislike of beetroot and as such feel no need to discourage others.I have in past assisted those who wish to go down that route.
The derivation is oxy=sharp moros=dull
Sounds more like you've stuffed the AH or it has a fault.
Neither my two units one modded the other original make any kind of extranious noise, mechanical or electrical.
The NOS sound is not to everyones taste, but you don't have to ram your views down other throats either ...so "you" don't like the sound, it does not follow that the sound you like is the correct one, to which everyone must slavishly follow. We are after all individuals with individual tastes and ideas the last time I checked.
I still note that no expaination has been offer why your comparing such dissimilar costing dac's ? or have I missed something ....
Neither my two units one modded the other original make any kind of extranious noise, mechanical or electrical.
The NOS sound is not to everyones taste, but you don't have to ram your views down other throats either ...so "you" don't like the sound, it does not follow that the sound you like is the correct one, to which everyone must slavishly follow. We are after all individuals with individual tastes and ideas the last time I checked.
I still note that no expaination has been offer why your comparing such dissimilar costing dac's ? or have I missed something ....
zanash said:
For me is does not matter what the DAC chip costs. If a 100 $ chip sounds better to my ears than the 2 $ TDA1543 so be it......
Most striking to me is many high end specialists switched to AD1853: Mark Levinson (Madrigal), Jadis, Lindeman, Accuphase.... a. o.
Elso Kwak said:
No company will design for an old formats, it's not financially viable.
from AD1843 datasheet
"The AD1853 is fully compatible
with all known DVD formats and supports 48 kHz, 96 kHz and
192 kHz sample rates with up to 24 bits word lengths. It also
provides the “Redbook” standard 50 μs/15 μs digital de-emphasis
filters at sample rates of 32 kHz, 44.1 kHz and 48 kHz."
who makes a cd ONLY players these days and what for the future?
allan
rfbrw said:
Defence industry is something to itself sometimes
It can be the leader of technology and the user of antiquated technology at the same time.
bit different to home consumer market moto
"has to make a profit"
allan
Hi,
I'm not sure but this dac looks like a td1543 mounted on spruce. I dunno maybe it's a tda1545a.
http://www.mother-of-tone.com/attraction.htm
http://www.mother-of-tone.com/Reviews/pace.html 😎
I'm not sure but this dac looks like a td1543 mounted on spruce. I dunno maybe it's a tda1545a.
http://www.mother-of-tone.com/attraction.htm
http://www.mother-of-tone.com/Reviews/pace.html 😎
zanash said:
Mr. Zanash,
Please read my post again. The comparison was between the Lite DAC-AH ($175) and the ART DI/O ($149). I think the retail prices are close enough to make the comparison reasonable and fair. I mentioned the AN DAC 1.2 only in passing and acknowledged the difference in price. I also think you should learn more about the AN DAC lineup. Not all of them are mega-buck machines. The DAC 1.2 was sold as a kit for around $700; a far cry from your claimed £1000.
awpagan said:
Mr. Awpagan,
What other problem could there be? I hear the squeal when the DAC-AH is power on, and I don't hear it when the DAC-AH is power off.
I purchased the DAC-AH because I was curious to know what the TDA1543 sounded like since so many here seem to like it. Members of this and other audio forums have specifically recommended the DAC-AH. It has also gotten good reviews and several modders offer upgrade packages for it, some charging over $1200. I figured for a unit to warrant so much praise and attention it must be pretty good to start with. If the DAC-AH lived up to the hype, it would be $175 well spent. Otherwise, $175 was the cost to learn that I can safely ignore the opinions of a great number of people. Now I know. I have to wonder, though, how BG caps, AN and Jensen xformers, and WBT jacks are supposed to fix the linearity problem.
awpagan said:
Which problem are you referring to: Sounding bad or squealing? You don’t have to answer because I became aware of both problems immediately after trying the unit out in my home system. After that, I took it to the lab to see why it was so bad.
Ulas said:
when i listened to the DAC-AH there was not any squealing from the unit and i believe there shouldn't be.
the squeal could be a sync problem not shure didn't puchase it.
i was looking at it for practise on mods.
there maybe or are better dacs(more expensive) but it was an improvement over the standard cdplayer
If you have done any mods yet, don't
speak to the supplier about the sqeal it maybe a DOA
if you have done mods there are a lot a people on this forum that could help.
allan
- Status
- Not open for further replies.