Rotel RCD-991AE: what's the upgrade path? - diyAudio
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Old 28th September 2004, 01:45 PM   #1
rameish is offline rameish  Singapore
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Default Rotel RCD-991AE: what's the upgrade path?

Currently I have the Rotel RCD-991AE which uses two Motorola MC7805.
It also uses two OPA-132PA and four OPA-2132PA op amps (the CDP has both single ended (RCA) and "balanced" outputs (XLR). Although I've been told it's not a true balanced design. The first thing I'm going to do is replace the OPA-132PA with OPA627 and likewise for the OPA-2312 via BrownDog Adapters. For not I will use IC sockets until I'm certain I like the changes/improvements. There are 4 Nichicon Muse FKZ 100uf 25 v just before the analogue outputs (I think I'll leave these alone for now)

Next step is to replace the two Motorola 5+volt regulators (MC7805AT) with ONSEMI MC7805ACT regulators (I'm not up to making a regulator yet). I think the ONSEMI regs are drop in replacements (am I correct in this?).

The third thing I would like to do is replace some of the regular Nichicon Electrolytic caps next to the toroid transformer with some Panasonic FC caps.

The 22 Black gate F caps I'll leave alone for now. The 6 Fine Gold (digital filter) I think I'll replace with Sanyo OSCONS.

Unfortunately or fortunately, there are some 6 Wima FKP (Green) and some 14 Wima MPK-10 in the analogue stage as well.

BTW I have the schematic on file and if any kind soul wishes to look at it please let me know. It's a large file btw.

Any thoughts and suggestions would be appreciated but please keep it simple. I can desloder a part and resolder but that's about it.
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Old 3rd April 2011, 10:50 AM   #2
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hallo, Im just reading some comments about modifications: so haw did You finished your rotel 991? may I receive your final decisions ?

nice day, Miro
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Old 4th April 2011, 04:11 PM   #3
Lautar is offline Lautar  Ukraine
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Tweak Rotel RCD-991AE
install thre transformer
DIYaudio.org.ua • ???????? ???? - Tweak CD Player
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Old 4th April 2011, 04:18 PM   #4
GoranB is offline GoranB  Poland
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14 WIMA in the analog stage? What for? Those could be for DAC.
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