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Class D Switching Power Amplifiers and Power D/A conversion

UcD400 Q & A
UcD400 Q & A
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Old 7th September 2017, 09:03 AM   #1801
Baka is offline Baka  Montenegro
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I don't know how beneficial could be the upgrade of that capacitor. I haven't done that replacement yet.

From the picture which I see the first what I would advise you to do is to replace the filter capacitor if that is Wima MKS (polyester) type. You can replace it with two 0,33uF MKP2 (polypropylene) caps, one above and the other below the pcb at the same pins.

This is the single biggest improvement IMHO.

Than you can concentrate to Hypex decoupling capacitors as well as those 4 naked BC capacitors.

Do you ultimately need those two coupling caps at the left bottom?

These are not perfect for that tusk since they are polyester caps as well. You can replace them with some better ones but since they will be bigger you should find some other position for them.
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Old 27th September 2017, 07:16 PM   #1802
meex is offline meex  Serbia
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Hi there..
Are there too much differences in sound quality between UCD with HxR voltage regulators and those without?
And how big that differences are? Which areas are most noticable?

Sorry if you already write about it but there are 180 pages
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Old 27th September 2017, 07:30 PM   #1803
Malefoda is offline Malefoda  France
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Yes they are worth the extra cost.
QED T260, Thorens TD-318 & Ortofon Super OM 20, Teac VRDS-10, Buffalo II & NTD1, UCD400, JBL 4313B: music!
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Old 27th September 2017, 09:10 PM   #1804
maxlorenz is offline maxlorenz  Chile
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As in every amp, if you improve PS and/or power different stages from special/exclusive good quality PS, the improvement will be evident.

Check also "Balanced Power".

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