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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
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Old 23rd January 2021, 10:30 AM   #361
jean-paul is offline jean-paul  Netherlands
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No please not.
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Old 23rd January 2021, 10:52 AM   #362
SuppersReady is offline SuppersReady  United Kingdom
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Thanks jean-paul,

That was the answer I was half expecting. Lots of little boxes it is then. I'd best be quick getting a linear psu put together.
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Old 23rd January 2021, 10:55 AM   #363
jean-paul is offline jean-paul  Netherlands
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When one does not have the ability to build PSU's at all one nowadays buys a ready made SMPS. This is also preventing messing with mains stuff to the beginners and thus safer. It is not one the best of choices in audio though. When one does know how to build a quality linear PSU that is shortest path to best results indeed.

BTW the answer was to built the PO89ZB IN the devices when these have SMPS adapters/wall warts. Why making more mediocre connections with 2.1 or 2.5 mm connectors than necessary? When built in there will be just 1 x 2.1/2.5 mm connector as the bare minimum which is good. When the device has built in SMPS the PO89ZB can be put in between as well.

Think of the 2.2/2.5 mm connector as "best avoided unless absolutely necessary".
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Old 23rd January 2021, 11:48 AM   #364
Mark Johnson is offline Mark Johnson  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Thanks everyone for your personal anecdotes and opinions! Very entertaining and quite a jolly diversion to read.
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Old 23rd January 2021, 12:34 PM   #365
jean-paul is offline jean-paul  Netherlands
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Here my second implementation but this time some of the parts are out of stock. This will be probably one of the last attempts with SMPS for my sources. All the well built (but factors more expensive) linear PSU's win by a margin but one must keep an open eye and do some experimenting IMO. In a previous one the PO89ZB was a good improvement.

As a better connector I tend to use Lemo whenever I can. These are mechanically and electrically very well designed. These do have a retention mechanism which is often omitted with cheap connectors.
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Old 23rd January 2021, 02:01 PM   #366
konst is offline konst  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc Send a message via MSN to konst
I have both a SMPS and a UltraBiB, and the UBiB on a Korg B1, if does definitely benefit form the PO89ZB, but not anywhere near as much as the SMPS. It just makes it sound a little tighter all around...
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Old 23rd January 2021, 06:50 PM   #367
ClaudeG is offline ClaudeG
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And at the end, when the filter is fitted on both PS, how would you describe the sonic differences, provided there are any? Any winner once the filter is fitted?

Thanks

Claude
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Old 23rd January 2021, 08:04 PM   #368
konst is offline konst  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc Send a message via MSN to konst
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The filter cleans up every aspect of the sound with the SMPS, sound stage more defined, and it is like a veil has been lifted.

With the UBiB it is the same but on a much more subtle level. The noise is measurable, but only just with my skills.

Strangelly enough, the filter seems to reduce some of the soft edges of the Nutube, sharpening the sound and bringing out subtle details on instruments
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Old 23rd January 2021, 08:45 PM   #369
ClaudeG is offline ClaudeG
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I have similar findings with my filtered SMPS :-)

At the end, which one do you prefer: UBiB with filter, or SMPS with filter? Is there a palpable difference between both options, or is it quite subtle / tends to a similar result?

Many thanks!

Claude
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Old 23rd January 2021, 10:38 PM   #370
jean-paul is offline jean-paul  Netherlands
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It seems that a low noise PSU is a worthwhile improvement This is of course a well known fact and we had a slogan long ago: a device is as good as its power supply. A straight thin line on our measurement gear is what we call good, amongst some other parameters. Using something noisy is not good and it calls for measures.... but those will be band aids for noise created earlier in the chain. If this is a system choice then we fixed the drawbacks.

@konst: it surprises me as UltraBib is supposed to be ultra low noise already. Without wanting negative criticism (I don't use these ultraBiB so I don't know them) : any good quality DC power supply for audio devices must have very low noise to be called "good". If a linear PSU is not ultra allow noise in a pretty wide bandwidth area it is better checked and when noisy by design it is likely not suitable for high quality audio (with or without veils ), regardless of the PSRR of the circuit in question.
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