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Old 18th December 2007, 07:37 PM   #1
Staykov is offline Staykov  Bulgaria
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Default Which grade is the PCM63P placed on RCD 991?

Which grade is the PCM63P DAC's placed on RCD 991?
Is the same DAC's in ROTEL RCD 971?
There isn't mark on DAC's in my old RCD 971.
Now I'm ready to upgrade with RCD991.
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Old 19th December 2007, 07:31 AM   #2
Nanook is offline Nanook  Canada
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Default 971 vs. 991

I don't know anything about the Rotel player, but did find a site that indicated 971=pcm63, 991=pcm63k

look here
for the data sheets. As far as I can recall the only difference is the operating temperature range
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Old 19th December 2007, 04:06 PM   #3
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If you do not see the letter "J" or "K" as a suffix to the part number, nor they can be found anywhere on the top, then the DAC must be a basic version.

Hope this helps.
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Old 19th December 2007, 05:28 PM   #4
OneyedK is offline OneyedK  Belgium
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Default Re: 971 vs. 991

Quote:
Originally posted by Nanook
I don't know anything about the Rotel player, but did find a site that indicated 971=pcm63, 991=pcm63k

look here
for the data sheets. As far as I can recall the only difference is the operating temperature range
http://focus.ti.com/lit/ds/symlink/pcm63.pdf
--> look at the table on page 3

Max THD+N at 0dB
PCM63P : -88dB
PCM63P-J : -92dB
PCM63P-K : -96dB

Unless Rotel wiped the markings, you should be able to read the exact type printed on the chip.
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Old 19th December 2007, 05:33 PM   #5
Staykov is offline Staykov  Bulgaria
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Yes, I know, but I'm still waiting my new RCD 991 and need some info in advance from the owners of RCD 991.
Is there a chance to find information in the service manual?
I'm looking for the schematics / service manual ROTEL RCD 991.
Anyone? please.
My e-mail is Staykov1975@abv.bg
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Old 22nd December 2007, 08:07 PM   #6
Staykov is offline Staykov  Bulgaria
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I'm looking for the schematics / service manual ROTEL RCD 991.
Anyone? please.
My e-mail is Staykov1975@abv.bg
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Old 28th December 2007, 11:45 AM   #7
flshzug is offline flshzug  Antarctica
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all dac should be matched trimmed , so if you have 50 pcm63 non-k thats better than 10 of K-s for the job .
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Old 30th December 2007, 06:25 PM   #8
Staykov is offline Staykov  Bulgaria
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I prefer 2xPCM63p-k
PCM63P-K : -96dB>PCM63P : -88dB
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Old 25th September 2008, 08:43 PM   #9
Staykov is offline Staykov  Bulgaria
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There isn't grade on DAC in RCD 991, but they are better than DAC in 971. I change them(from 991 to 971) and there is difference between.
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