Philips LHH1000??

Status
Not open for further replies.
Jump to Latest
#8
Philips LHH2000

Hi!

Can anyone give me elaborated opinion about possibilities of treating the TDA1540 the right way so it can achieve top performance and I do not mean in absolute terms but in the way it's been done with Philips LHH2000?

When I was young and working at the radio station I stumbled across one of the LHH2000s and listening to it through Tannoy Red 15" studio monitors I was stunned by the shear immediacy and reality of presentation. It was very emotional experience to be so close to what-the-artist-ment! ... And on CD!?!?!

Maybe I remembered it falsely but for many years that I've spent in quest for the ultimate sound reproduction the emotional aspect for me has been the strongest point in evaluation of the audio component.
 
#10
What a stunner this CD73 of yours!

So, Tubee,

you don't honestly believe there's much we can do harnessing TDA1540 a bit more up to its' potential! There must be something that's very time-consuming and absolutely uneconomical and therefore up our diy-alley!

Calling all forum buffs!

I am a great admirer of P.W.Klipsch who did turn our heads to think the alternate way.

I would like to get my hands on some bit-counter to measure dynamically the bit-consumption/sec in CD-player during playtime to possibly prove that the problem of quality do not necessary lie in word-length. I mean, I have it in my WaveLab application but I'd like to have it as a hardware standalone component.

I'll let you know if that happens but I feel it in my bones to be the way to the answer ... or it's my age playing with my expectations, ha ha ha!

Of course, we need the whole 16 bits but how we handle 14bit-DAC is making the whole lotta difference. When we decide about the quality of the component we are not "politically" correct bringing 2 machines in comparison and not ensuring equal state of readiness. We're not talking about different home planets but 2 persons reading a book where one (older 14bit) is reading it from the third-person's hands and the other (younger 16bit) is getting all kinds of help and still the former reader is strangely fascinating.
God, that was tough to get out of my system ...

In a nutshell, go listen to some vinyl on a nice equipment and you'll now what a detail and a treble is as an analogue experience - what our brain can take as plausible, convincing. You can witness great sense of speed and dynamics if the harmonics are played right, and in the end that's my thesis! By preserving harmonic content we get greater, objective proof of quality.
Philips did it gracefuly in LHH2000!

See you a few bits later!😀
 
#11
Hi dsmiljanic

I have the Philips CD300 14 bit, unfortunately not the Marantz.
Here is one: http://www.allegro.pl/item162310998_philips_cd_300_bcm.html

What you can do is replacing PS caps with decent ones, like Panasonics and at digital chips Sanyo oscon. Keep the NE5532, it is not that bad. and if you want to swap it, try then LM4562. But this one is more analytic i think, though i never tried this opamp myself. Will buy some in near future from digikey.

Coupling caps is better replaced by Auricaps or Audyn-cap, but don't use the Audyn-cap plus, i did, and didn't like it as coupling cap.
Replace the decoupling caps under the dacs with small MKT's, and replace the diodes in supply with BYV26's or something like that. Search for the mods, lot to find.

Or.... leave as it is, its a classic.

I like also natural and analog sound, now busy with PCM56s right after the decoder chip, non oversampling. Directer then this is not possible, like your Klipsch sound. This dac is mono like TDA1540.
I listen to a horn-based transmission line, 2way ML-TQWT.
 
#12
Ah, yes! Yours is a Philips!

Also a stunner! Easy for Marantz to copy the beauty of Philipses! Just comb them, anodize them, put some color in the LEDs and here you are - you have a prestige product.

Thanx Tubee!

You have a good ear an disciplined mind if you can understand horns and accept them. I would like to build TQWP enclosure and probably will later down the brick road.

I am familiar with the most of the mods concerning CD104.

I am also concerned about the perception of distortion in general.
A friend of mine, musician also, told me the other day that some kid having heard some brass sequence from his unfinished studio project said that it was full of distortion from the brass lines. He asked the kid had he ever heard real brass and the kid said no. Not knowing better kid decided that that was distortion he heard and not the natural flow of air and the leaks from the mouthpiece + valves flapping.

Have you ever felt discomfort in listening to realy high resolution system (analogue or digital). I have! Therefore, being once beaten I am twice shy!

I am careful about chasing dynamics and detail because I could be listening to "distortion" and not the music.

Maybe the problem of TDA1540 realy is the oversampling and the subsequent noise shaping. Like forcing valves to maximum voltages for higher power ratings and by doing so pulling all of the ugliness out along with the accomplishment of desired parameter.

Just food for thought!

Over and out
 
#13
dsmiljanic said:

Maybe the problem of TDA1540 realy is the oversampling and the subsequent noise shaping. Like forcing valves to maximum voltages for higher power ratings and by doing so pulling all of the ugliness out along with the accomplishment of desired parameter.
Click to expand...

Ummmm, I wonder.
Look at the picture of the audio board of the LHH2000. In the middle you will see the SAA7030. It is an oversampling digital filter.
 
#15
LHH2000

Hi rfbrw!

I understand that LHH2000 uses the OS but how is it handled.
I'm very convinced that the strength of an aparatus lies in its heart and blood vessels namely POWER SUPPLY and distribution of energy.

I also see heavy shielding or is it more of encapsulation, great choice of components (which you guys covered perfectly), relative position of electronic "organs" and brilliant execution. I do not critisize CD104's build (it was great) but it was also comercial product that was suposed to attract people to digital perfection for quite reasonable money.

I say try to rebuild power supply (I WILL!) with C-L-C-filtering (is it called Pi-filtering?). Voltage regulators (78XX, 79XX) are very good in achieving nominal voltages but very bad at filtering (realy!; El_Will change the regulators with new ones immediately because the old ones leak!). Get to nominal voltages by using Zener diodes. Filtering decides directly on harmonic content or most frequently kills the real ones and induces unnaturals (especially in single-rail-supplied electronics). Bypass electrolitycs with dedicated R-C-element for opening the power line and than we'll see (again I WILL and try to measure it an present it to you honourable gentlemen).

I am also building a single TDA1541A S1 NOS DAC (DAC IC cost me some 10 EURO, not bad at all!) and feel happy about all things digital which is quite a step for me.

P.S.
Warning for all the Regulators:
Don't "leak" on my head telling me that it's raining!
 
Status
Not open for further replies.
Top Bottom