shematics of ROTEL RCD-990 - diyAudio
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Old 10th January 2006, 09:56 PM   #1
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Location: Rome
Default shematics of ROTEL RCD-990

Hi everybody , does anyone have the shematics of ROTEL RCD-990 ? Would be helpful, since I will be receiving one by the end of this week and would like to start looking into it for modifications. Thanks in advance .
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Old 11th January 2006, 01:20 AM   #2
Luke is offline Luke  New Zealand
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Hi Paul,

I dont know much about this player. Is it same topology as rcd-991 with dual pcm 63 and diff output? The 991 player is a bit odd, as on paper it seems exceptional, but owners on forums I have read merely describe it as a capable player and not overly musical. I find this strange as it uses blackgates and wima mkp ex factory, and of course the ever famous pcm63. Any one got any comments about these two players as i was considering maybe buying one?
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Old 11th January 2006, 05:35 PM   #3
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Location: Rome
Default Rotel cdp

Hi Luke,
you can try asking other listmates. There are some that have a rotel rcd991 and have already done some modification.
Concerning the 990, it was rotel's best cdp ever made. They tried to make a hi-end player at a resonable cost using the best components available. You can check Rotel's manual page and you will find on interesting description on the build quality of the cdp.

I've found schematics for the analogue section of this cdp, and looks some upgrades are nedded specially changing the 2xne5534 and 4x ne5532 with better sounding opa627.
It will probably get an improvement changing the clock, but I'm waiting to receive the player to understand better how it was designed and the components, since I've found only rcd991 modification's and don't have the complete schematics of the 990.

The 990 has the philips cdm9-pro mec and is very difficult to find since it was practically on the market for 4 months before it was sold out and replaced by the cheaper 991.

Hope this can help
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Old 11th January 2006, 08:22 PM   #4
Luke is offline Luke  New Zealand
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thanks Paul,

I have seen a thread with someone modding the 991, but I saw no new clock and replacing many blackgate capacitors. I thought the gains would have been minimal if any. It seems this player is factory tweaked and no fun
Is the 990 similar then to 991?

regards Arthur
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Old 11th January 2006, 09:23 PM   #5
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Join Date: Nov 2004
Location: Bruchsal/Germany
the Rotel RCD 991 is better than the 990 .

the 991 is easy to mod : Diodes , better BG :N-Type ,
Clock , better MKPs than the Wimas and you can use
the Pass D1 I/V Stage , thats better than OP-Amps .

Greetings from Germany

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