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replacing 47mf for 33mf caps...good idea
replacing 47mf for 33mf caps...good idea
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Old 26th April 2011, 06:02 PM   #1
grahamfocal is offline grahamfocal  United Kingdom
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Default replacing 47mf for 33mf caps...good idea

I do appreciate that changing capacitor values is not really the best idea.
I have a new CD player (well second hand over 10 years old) and a load of Slilmic IIs, trouble is that there are a lot of 47mf 25volts in the CD player, but I only have 33mf 25volts.
Will it hurt? basically, or is it best to make sure I buy the correct ones.

Thanks
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Old 26th April 2011, 06:13 PM   #2
picowallspeaker is offline picowallspeaker  Italy
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I haven't done such mods , but I see that commonly used values can be in the order of a magnitude less
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Old 26th April 2011, 06:17 PM   #3
marcelnl is offline marcelnl  Netherlands
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don't worry too much, although going up in capacitance would be better the improvement will probably still be noticeable ...
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Old 26th April 2011, 06:51 PM   #4
poynton is offline poynton  United Kingdom
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As you may have read, some caps are sensitive to value.
I'm thinking in the servo section of players with the Philips cdm1/2/4

Remember, do mods one at a time. Then you know where to look if it stops working.

Andy

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Old 26th April 2011, 06:53 PM   #5
Conrad Hoffman is offline Conrad Hoffman  United States
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If you had an esr tester you'd know if the new parts were better or worse than the old ones. As is there's no way of telling if you're accomplishing anything. Just being old doesn't mean they're bad in any way. OTOH, if they're substandard after a year, they need to be replaced.
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Old 26th April 2011, 07:36 PM   #6
grahamfocal is offline grahamfocal  United Kingdom
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Quote:
Originally Posted by poynton View Post
As you may have read, some caps are sensitive to value.
I'm thinking in the servo section of players with the Philips cdm1/2/4

Remember, do mods one at a time. Then you know where to look if it stops working.

Andy

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yea as you probably remember, you helped me a lot on my Orelle CD100 along with Mooly this does indeed have a CDM4-19. I have upgraded the OPAMPS already, with a good outcome (the musical FID CD1 even had the chip holders already installed) had the whole payer apart to count and note the caps. Lots of 47s, so might just (as I am no expert) get the correct ones, the 33s will probably come in handy. Thanks all.
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Old 27th April 2011, 09:43 AM   #7
amc184 is offline amc184  New Zealand
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It depends on what the capacitor is doing. If you're talking about the 47uF capacitors that many manufacturers used as local decoupling for every IC, then yes, no problem, anything between about 22 and 220uF will do the job. However, in some rare circumstances it may cause a problem. It's unlikely though, electrolytic capacitors are very poorly toleranced, so are generally not used in a situation where capacitance value is so critical that a 47uF unit would work yet a 33uF unit would not.
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Last edited by amc184; 27th April 2011 at 09:45 AM.
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Old 27th April 2011, 12:23 PM   #8
grahamfocal is offline grahamfocal  United Kingdom
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Quote:
Originally Posted by amc184 View Post
It depends on what the capacitor is doing. If you're talking about the 47uF capacitors that many manufacturers used as local decoupling for every IC, then yes, no problem, anything between about 22 and 220uF will do the job. However, in some rare circumstances it may cause a problem. It's unlikely though, electrolytic capacitors are very poorly toleranced, so are generally not used in a situation where capacitance value is so critical that a 47uF unit would work yet a 33uF unit would not.
Many thanks for that.
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Old 27th April 2011, 06:10 PM   #9
Fidelity Audio is offline Fidelity Audio  England
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I usually find going up one or two levels of uF in capacitance helps with bass weight and smoothness. Going lower with the uF can tend to lean out the sound pushing it a little towards upper mid dominance aka Naim etc. Too high a uF can make the bass over bloated and ploddy.

Again this all depends what voltage rails you are swapping capacitors on, generally digital circuit rails prefer larger uF capacitors where analogue rails can tend to get away with lower uF.

Not counting ESR and ripple there are lots of ifs and buts.

Brent
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