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FS:B&O ICEpower 200ASC modules - 20PCS

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#181
Re: Could you state part numbers and vendor on the connector parts used?

wimdehaan said:
As promised.

Attached you can find a PDF file regarding the ASC200 board connectors as used / done in my ICEpower amplifier.
Click to expand...


You are very generous sharing this, thank you
🙂

I would like the center holes on the board for mechanical stability, do you think it will be a problem doing like this:

-Chassis ground connected through mounting screws, but on one board is ground jumper removed...

-No chassis ground via J1
 
#182
Jan-Peter said:


Indeed we use the LM4562 in HG series. However not for compensating anything, but becasse this op amp sound extremely clean. Extremely nice op amp.... :angel:
Click to expand...

I've toyed with the idea of replacing the ST opamp, in the ASC200 modules I bought through this thread, with LM4562 type amplifiers. But the existing opamps on the boards are epoxied down (some pretty mean red stuff, like I've tried to remove before on other products, not easy!), and I'm afraid I might rip up some traces if I tried that. And the ASC200s are sounding great, so I don't have much real reason to cut them up.
 
#183
've toyed with the idea of replacing the ST opamp, in the ASC200 modules ..... like I've tried to remove before on other products, not easy!), and I'm afraid I might rip up some traces if I tried that.
Click to expand...

Maybe the attached photo is some help. I had some good results with this help of removing SMD opamps from the circuitboard. The trick is that heat up first the completelty left pin, if hot just pull the wire and the pin flips up and is free from the board, next the following pin etc. In the end all pins are free and you can remove the SMD itself with 'bruut' force.
 

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#184
Originally posted by Skorpio Post #181
I would like the center holes on the board for mechanical stability, do you think it will be a problem doing like this:
Click to expand...

I would not be worrying about the mechanical thing, the 4 corner places are enough for the size of the ASC200 board.

The 2nd board needs also a ground reference, I feel it should be no problem to connect both boards with W200 directly to chassis. Make sure housing is making connection to board, so remove paint and so and do check with DVM
 
#185
Removing SMD

Removing SMD opamp might result in peeling off the track if not done properly. I found the easiest way is to chop off all eight legs with pen knife, then remove the critter which had seperated from the legs. Apply some solder to remove all those eight legs still stuck to the pads. Risk free. 😀
 
#186
Thanks, but the problem isn't the pins, it's the epoxy under the body (removing pins on a SOT8 is simple-- just flood solder over pins on one side, flip the part up, repeat on the other side. If you're worried about saving the part, do that with low-temp solder). But the epoxy under the body can rip up what's under it no matter what you do to the pins.
 
#196
These units are not copied and the thread you are referring to is of 3 years ago.

Are they still copying stuff of others ? That would be wrong. Do they sell genuine stuff now ? They do, which is not a problem. This thread is about the last category. Or am I oversimplifying things ?
 
#197
About ASC200 sound quality
Click to expand...

I do know that testing in terms of sound quality can be doubtful, because so many things are involved (maybe the test persons as main variable). But for those who are interested I will give my impression of the ASC200 module in terms of sound.

My favourite instrument is the piano and heard many pianists in concert, like jazz pianists Keith Jarrett and Michel Petrucciani and classical pianists like Radu Lupu, Arcadi Volodos, Elisabeth Leonskaja and for example Evegini Kissin. Meaning? I do know how a grand piano can sound, no doubt about this. And for sure know about different approaches and styles.

Today I had the opportunity to compare the Tripath 4100A based kit by 41Hz.com and the Hypex UCD180HG and my ASC200 based amplifier.

One of my reference recording is Michel Petrucciani’s ‘Live au theatre des champs-elysees’, a live recording for jazz solo piano. For impression you might like to visit http://www.wimdehaan.nl/music/index.html

The openings track with announcement, applause and openings track can sound so different in different systems. The recording and his playing is very sensitive in many ways, sometimes it is ‘sterile’ and so much transistor sound that it doesn’t sound at all and you will be ‘forced’ to switch off. His playing and piano can be so awful.
The Tripath 4100A based amp offers less bass and less low-bass info compared to the ASC200 based amp, also soundstage is less compared to the ASC200. The ASC200 has much more punchy low end and more grip. Treble is comparable. The Hypex UCD180HG I did not hear before, I heard and compared before the version without ‘HG’.
The Hypex offers excellent sound, like a very high quality solid state amp. So the recording mentioned above sounds very good to excellent, no complains. However changing the amp to the ASC200 the sound of the piano changes so much that I had my doubts about the Hypex. Most piano CDs sound like a recording, the Hypex does also. So the above mentioned CD sounds like a very good recording, but you never get the feeling you are there or you get the feeling what a piano you can give. But the ASC200 based amp sounds like a live performance: full bodied sound, full dynamic piano sound and we are really listening to music. This ASC200 goes to the level of my all triode based 6336A push-pull tube amplifier. Some people will say this is colouring and manipulating the sound, but it is not so, you have to believe me on this. I prefer the ASC200 over the Hypex UCDHG, no doubt. And than we paid only 100 euros for stereo including power supply, even more remarkable because we can not find one audiophile component on the ASC200 board, the MC33078/79’s are made for audio, but from the past I do know they are no good, an OPA2134 gives already so much more info, but somehow the B&O people implemented all components in such way (maybe all by coincendence) that this amplifier has such an excellent sound and makes your CDs very listenable.

Of course other music was played like big band, string quartet and some pop.
 
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