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Old 30th December 2009, 09:09 AM   #1
RAFG is offline RAFG  Europe
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Default Help with a Rotel 855 Cd player mod

A friend of mine is modding an old Rotel 855 CD player (to make good use of its 1541A dac) for me and He's changing all the caps. There is only one 1.5uf bipolar electrolytic to substitute, but it's very hard to find. Is this value changable? Could I use a 2.2uf or a 1uf cap? Does anybody know? Thanks for your help in advance.
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Old 30th December 2009, 01:34 PM   #2
Bill_P is offline Bill_P  United States
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If this is C126, it is part of a snubber circuit for the radial motor driver. If the cap isn't defective there is no benefit to changing it.

Wholesale replacement of all capacitors doesn't strike me as a smart thing to do in general.
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Old 30th December 2009, 11:44 PM   #3
amc184 is offline amc184  New Zealand
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Quote:
Wholesale replacement of all capacitors doesn't strike me as a smart thing to do in general.
Actually, I've always been an advocate for this. It's usually the first thing I'll do when I get an older (10 years or more) piece of gear, be it a CD player or amplifier. Anyway, to each his own.

A 1.5uF is hard to get hold of, and in my experience a defective capacitor in this position can cause issues. 1uF is fine, I have used this value for this capacitor many times without a problem.
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Old 31st December 2009, 01:05 AM   #4
Bill_P is offline Bill_P  United States
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Originally Posted by amc184 View Post
A 1.5uF is hard to get hold of, and in my experience a defective capacitor in this position can cause issues. 1uF is fine, I have used this value for this capacitor many times without a problem.
The capacitor was evidently untested so how do you know it is defective? Reducing the value reduces the effectiveness of the snubber. If the designers thought 1uF was enough, they would have used 1uF. This change is ill advised.
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Old 31st December 2009, 08:35 AM   #5
Mooly is online now Mooly  United Kingdom
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Must admit I believe in replacing old caps... and replaced ALL electroylitics in my Micromega Stage 2.
However an unwritten rule of mine... any work I do must look original... no make do or fitting oversized parts etc.

As to the 1.5uf cap... well Philips often used "odd" values, never more so than in TV's and Video gear. Things like a 221000 ohm 0.1% resistor that's in series with a 100k cheapo pot. Tolerance on electros is wide anyway... I wouldn't worry over fitting a 2.2 for a 1.5... and if it's across a motor... well the characteristics of that 15 years down the line will be very different to when it was new (brush and commutator noise)

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Old 31st December 2009, 03:38 PM   #6
RAFG is offline RAFG  Europe
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Default Thanks for your help guys. Happy upcoming year!

Other opinions are welcome though...
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