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Old 25th September 2003, 08:20 AM   #11
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Can someone please tell where i can get more info on doing the DAC upgrade? I have done the clock and opamp upgrades already. Since this thing is so cheap and I also own a meridian 508.20, I dont mind experimenting with the Rotel.
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Old 25th September 2003, 08:24 PM   #12
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Desolder the original PCM63's ( only when they're P or J grade versions ) and solder in 2 pieces of PCM63K. K is the highest grade. They're all 20 bit colinear chips and not 18 bit as I read here. I wouldn't use PCM63K in piggyback configuration, for financial as well as for technical reasons.

Please use desolder braid and give up the thought that the old PCM's will survive the desoldering. They are sensitive I can tell you. Clean the board with alcohol and a cotton cloth afterwards while wearing an antistatic band around the wrist that's connected with ground/earth. Make sure you clean again with a dry cotton cloth.
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Old 25th September 2003, 11:06 PM   #13
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What do u mean excatly by "solder in 2 pieces of PCM63K"? Liek stack them on top of each other? And who sells these? Digi-keu or Mouser maybe?
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Old 26th September 2003, 01:27 AM   #14
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Never mind....i see it uses 2 seperate chips...


Ok so I want to know if the newer (and AVAILABLE unlike the other one), PCM1704K DAC will work? Or would it require further modification to work?
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Old 26th September 2003, 02:35 AM   #15
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Quote:
Originally posted by jean-paul
Desolder the original PCM63's ( only when they're P or J grade versions ) and solder in 2 pieces of PCM63K. K is the highest grade. They're all 20 bit colinear chips and not 18 bit as I read here. I wouldn't use PCM63K in piggyback configuration, for financial as well as for technical reasons.

Please use desolder braid and give up the thought that the old PCM's will survive the desoldering. They are sensitive I can tell you. Clean the board with alcohol and a cotton cloth afterwards while wearing an antistatic band around the wrist that's connected with ground/earth. Make sure you clean again with a dry cotton cloth.

Hello Jean-Paul, can you piggyback TDA1541A? I have seen articles where they are paralelled to decrease errors, I was wonderigf if they could be piggybacked to do the same thing?

Thanks

Anthony
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Old 26th September 2003, 05:53 AM   #16
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I don't piggyback any chips. Period. Sorry.

Quote:
Ok so I want to know if the newer (and AVAILABLE unlike the other one), PCM1704K DAC will work? Or would it require further modification to work?
PCM63K is available for the ones that SEARCH. Why on earth would I suggest a chips if it is unobtainable ? I can buy them here easily so I guess you'll be able to find them as well.

PCM1704K is not a direct replacement AFAIK. You'll have to design a new board for that.
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Old 26th September 2003, 08:00 AM   #17
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Few years ago I've modded a 971 for a friend.
Put an LCaudio clock in,
LM6172 opamps,
replaced tre coupling caps with film caps,
We both like the player.

Months later we replaced the PCM63's with K grade, but that was a minor improvement IMHO.
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Old 26th September 2003, 03:11 PM   #18
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Quote:
Originally posted by rbroer
Few years ago I've modded a 971 for a friend.
Put an LCaudio clock in,
LM6172 opamps,
replaced tre coupling caps with film caps,
We both like the player.

Months later we replaced the PCM63's with K grade, but that was a minor improvement IMHO.

I have the same experience/oppinion.
I had very good results even with cheap and old cd players with a well modded analog stage (I also love the LM6172 ) and, if possible, a good clock.
I have a very old Telefunken CDP on my fourth system.
That CDP was given to me.
Inside it's all Sony.
16bit dac, 4x OS.
Really old, Led dispay.
Some people would cry if they listened to it.
OPA2132 (well bypassed!) replaced the nasty JRC op-amps.
Some new electolythics (nothing expensive) and that's it.
A new clock would be overkill here.
But it sounds very good to me, even as it is.

I have an LC clock on my Yamaha CDP I use as a transport.
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Old 26th September 2003, 03:25 PM   #19
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My experience with replacing PCM63P or J is slightly different. K version is an improvement ( not too big but remarkable ) but if there are adjustment pots on the PCB it is better to remove them if you haven't the equipment to adjust them for least distortion. Leaving them as they are will degrade performance of K or whatever version more than no pot at all. My experience with these chips was not when used in this particular Rotel cdplayer but in some Pioneer models and separate DAC's.

A better clock and better output stage/opamps are the most interesting and rewarding mods, that's true. Last time I bought K versions they were so cheap that I replaced the old ones for them anyhow.

Most of the time the same discussion applies to TDA1541A and TDA1541A-S1. Some hear a difference while others claim to hear no difference at all. I was surprised by Peter Daniels report on the difference a S2 version makes.

TDA1541a S2
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Old 26th September 2003, 03:36 PM   #20
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Quote:
Originally posted by jean-paul
They're all 20 bit colinear chips and not 18 bit as I read here.

You're right, Jean-Paul.
I made a confusion with the 951, that has an 18-bit dac (PCM69) and PMD100 digital filter (HDCD).
The 971 is another league.
Anyway, on Rotel gear (including some integrated amps) you can usually see OPA2134 or OPA2604 op-amps.
The 971 has two OPA2604 op-amps.
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