Tweakers' Asylum

RE: About the rcd-855

204.154.128.114

pars

In Reply to: RE: About the rcd-855 posted by ramw on June 22, 2007 at 01:28:10

Hmm, that wasn't my experience with the faster opamps. I never tried 2604s, but the AD826s and LM6172s both sounded good in mine. I have tried OPA2134/2132 in it and they sounded pretty good as well. The stock Signetics NE5532s in mine sound slow and dull comparatively.

Mine does have 11DQ10 rectifiers for the +/-5 and +/-15 V supplies. And a Tent XO on a custom Flea board with onboard /2 for direct DAC clocking (sep. PSUs for clock and divide logic). Didn't bother with the jacks. What is the problem with the power supply switch? I should probably replace the PSU caps on mine with Pana FMs or FCs.

Follow Ups:

RE: About the rcd-855 - twl168 16:53:51 06/24/07 (1)
Thanks. I will try the AD826 too. Seems like I will be using this player for quite sometime and I could have all the time to play around with different Op.

At lease, I kind of get a idea that each op will do differently to each person who tried. Matter of taste I guess, and without trying, I will not know what suite me best.

So, I will try opa2604 and ad826 along with 11DQ10. How many 11DQ10 do I need to buy?

Thank you
- RE: About the rcd-855 - pars 11:05:31 06/26/07 (0)
  You should really get the service manual/schematics if you don't have them (email Rotel US and they will send you a .pdf for free). And you also should make certain you understand what you are doing before you start playing around with power supplies or anything near the AC.
  
  I replaced 8 diodes on mine (the bridges for the +/-5V and +/-15V supplies). There are some other 1N4003 (IIRC) diodes in the player, but I haven't gone thru the supply enough to determine what they are there for, so I left them alone.
RE: About the rcd-855 - rawwmw 23:57:10 06/23/07 (0)
Adding a clock must have really advanced the player to today's resolution minor league, good move.
After trying so many op-amps, all sounded better than the stock ones, all made an improvement in different areas-the OPA2604 is the most "wholistic" IMO.
Replacing the switch is a good idea with any 20Y old component, I took apart the one in my 855 and it was totally charred, I had a similar laying around, easy to replace and cleaned up the sound a little.

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