Conference hips::uk_audioo

    If you are listening to PWEI does it really make a difference?
    

    I thought all your music sounded like the singer has a stutter!
    
    
    Stephen.
    
    PS. It depends on the direction of the scratch as to what can be
    done.

Thanks for all the sensible comments so far!

re .1 I tried to adjust the tracking weight, but after many hours with the
player in little pieces, I couldn't find it. Does anyone know how to put a CD
player back together? 8-]

re .2 Whats a Linn 8-]

re .3 Andy, is not PWEI, it's Jesus Jones!!

The scratch is a along a 'chord' (maybe, that's what I was told anyway!)
ie. Its at a tangent to a track on the CD, which I guess is why it causes the
laser to jump back by one 'track'.

Any ideas?

Steve.

    I too have a scratched CD that jumps.  My Philips CD 104B tracks fine,
    my expensive Meridian 206 jumps.  I've tried cleaning the CD in a CD
    cleaner with "CD cleaning fluid", this helped, but hasn't fixed the
    problem.  
    
    So, I too am looking for helpful suggestions.

	Brasso, or any abrasive cleaner will work. Depends upon the
	extent of the scratch I suppose. Even wet and dry might be
	necessary.

	Of course if you go right through the coating that'll be it
	but I tried it on one disc and managed to get it to the point
	where only the faintest sound could be heard. The more effort
	you put in, the better the results.

	-John

 I had a bad scratch on one of my CDs, and found an amazingly simple way to 
solve it, I waited till just after Christmas, and then took it into WHSmiths
and told them that it had been a Christmas pressy, that was like that when I got
it. Simple eh ????

		 Anon.
		

    I hgave read mentions of toothpaste being use as a very mild rubbing
    compound, in the US AUDIO conference.  Hit KP7 to add...

    Gidday!
    	Yep, use "Brasso" or "Silvo" or some FLUID based metal polisher...
    this stuff is abrasive......it will "cut" the plastic layer back so if
    you go too far you get into the aluminium and you are snookered (you
    are now anyway so you have nothing to lose). I suggest 'polishing' the
    scratch out  a bit at a time, play the the CD until you get it over the
    scratch ok and the quit. 
    	This has saved me once before with a real deep scratch! As far a
    your earlier replies go.....had these guys lived earlier they would be
    still telling you how good their mono Edison's were [wot, my head in
    the sand.......;-)] I must confess to being a late CD convert but only
    after the advertising bullshit/hype over the the 1st generation CD
    players had quietened down ( they were terrible players!), even now I
    have held back giving out as much dosh on  a CD player as I have in the
    turntables until the players get better, they  are not bad now but
    there's more work work to be done on A->D convertion.......it's going
    to be a fun future.
    
    	cheers fjeff (who couldn't resist a dig back at the flat earthers!)
                                                                

    Read my ``personal naim'' lately :-)
    
    Whats wrong with mono ?
    
    A mono 'brick sounded pretty damned good to me - in a 10'x8' room
    
    	Rik
    
    PS Now that CBS are no longer producing those nice round black thing I
    shall probably have to get a little square black thing to play those
    nasty little silver things . . . Mind you at least CD players are almost as
    cheep as the CD (Midi-size Phirips CD �20-00 .v. Our-price CD �12-00)

    I used Duraglit to polish out the scratch that caused my 206 to skip. 
    It worked a treat, thanks for the advice. 

RE: .10

>    turntables until the players get better, they  are not bad now but
>    there's more work work to be done on A->D convertion.......it's going
>    to be a fun future.

Can't quite see whare A-D conversion gets you!

    RE: 13                                                             
    
    	Most music is analogue (except digital synths. etc) so in order to
    get it onto your precious little silver disks you need a A/D converter.
    
    So the quality of your CD is immediatly limited to the quality of this
    converter. These are getting better (*) and hence the quality of CDs
    is also getting better.
    
    	Rik.
    
    $ Set Mode /Linn
    
    * Linn product have produced a D/A + A/D converter called the Numerik.
    CDs produced using this are supposed to sound significantly better than
    your average CD. The latest Carol Kidd CD (DDD) and LP (DDA) were recorded
    via this box of tricks so I've been told - might be worth a listen.
    
    $ Set Mode /NoLinn

    There was an interesting article in one of the Hifi magazines this
    month titled "Simple Sampling" written by some electronics (not hifi)
    expert.  It explains how CD players work and highlights a couple of
    problem areas with current technology.
    
    One of the problems was associated with two box setups, where the
    synchronisation of converters can cause problems unless complex phase
    locked loop circuit techniques are used in the timing electronics.
    
    Have read it once, but hopefully the article makes more sense on the
    second reading.  
    
    Iain.

Which magazine, and which issue?

Could you possibly put a copy of the article in the internal mail to me please?

Scott Marshall   REO D4/3A

    While your at the 'copier ...
    
    Rik Watson @SBP F11/1
    
    Thanks in advance.

    
    It was HiFi News & Record Review.
    
    I thought it was a pretty interesting article. The author made some
    very blunt statements, which I'm sure many people will disagree with.
    
    For example, he was against two box players for the reason mentioned in
    .-2, because the D/A box has to recover the clock from the data stream
    using a DPLL. If the D/A is in the same box as the transport, you can
    use the same clock for reading the "timebase corrector" (i.e., the disk
    output FIFO) as for driving the D/A section, which should lead to less
    timing errors.
    
    Next month's issue is going to contain part II, which is about
    oversampling.
    
    Trevor

    What are the odds that the next generation of transports and DACs have
    a clock line as well as a data line....?
    
    Or DACs with a clock switchable between internal (derived from the
    data) and external (derived from the transport's PLL)?
    
    Dave

re .19:

Some already have something like this.  If I remember correctly, the Sony
CDP-R1/DAS-R1 generated the clock in the D/A and sent it to the transport over
one optical link, and received data back on another, closely sync'd with the
incoming clock.  Not sure what the equivalent model does now - they replaced it
recently.

Nick

    Will copy, and dispatch.
    
    Iain.

    CD scratch repair ? NO PROBLEM
    
    You just go to your nearest optician (anyone wear glasses ?) and buy
    this liquid stuff called "Glass Repair", which is ment to repair small
    scratches on your sun glasses. 
    
    You drop a tiny drop on the scratch, spread it, let it dry 24 hours,
    then you polish the mate surface with a cloth until you get the shine
    back in.
    
    I have been there. It works. And even if it doesn't, this method is not
    as destructive as the earlier mentioned metal (!?!) liquid polishers.
    
    Hope this Helps,
    zj