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Post by dsjr on Dec 22, 2015 10:11:31 GMT
Anyone interested in ordering one, should enquire as to the availability of suitably styled sockets. Mine has the gold-timed ones and a sharp scratch on one where someone before me was a bit careless with a plug.. As for noise, my early one does hum slightly late at night, but subsequent ones have very heavy doping applied (pics on HFS somewhere) and this seems to have solved it.
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Post by MartinT on Dec 22, 2015 13:36:38 GMT
What did you think of the 'scope captures, Dave?
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Post by dsjr on Dec 22, 2015 17:53:53 GMT
Alarming to say the least! trouble is, only a tiny handful of people will know this, as the rest of us have no way of measuring or displaying such! High frequency harmonics can be sort-of dealt with I believe, but whether a clipped waveform such as you've shown (looks like clipping to me) can be dealt with in audio power supplies/rectification/regulation I have absolutely no idea.
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Post by Mr Whippy on Dec 22, 2015 19:26:30 GMT
Do you have any idea how the waveform distortion might manifest itself, Martin?
When my mains is "off" the sound takes on a leaden, congested, bunged-up, sat-on quality. It looses that ethereal, airy quality. I loose interest in listening. The level is usually around 245V.
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Post by MartinT on Dec 22, 2015 21:12:25 GMT
That's a good question and what I can do is put the P10 in passthrough mode, so that it passes raw mains when switched off. In fact I set that mode for the source components and preamp to keep them warm. With the P10 off, the depth, noise floor, clarity and verve all go off to a degree.
I use it for a reason, and in this house at least my mains is high in voltage and poor in waveform pretty much all of the time. The P10 keeps me pretty much immune from it.
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Post by MartinT on Dec 22, 2015 21:16:10 GMT
To answer your question, it seems to be a combination of high V (saturating transformers and making them noisier) and distorted waveform (lots of harmonic content to handle in the PSUs, testing their PSRR).
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Post by MikeMusic on Dec 23, 2015 8:04:05 GMT
That's a good question and what I can do is put the P10 in passthrough mode, so that it passes raw mains when switched off. In fact I set that mode for the source components and preamp to keep them warm. With the P10 off, the depth, noise floor, clarity and verve all go off to a degree. I use it for a reason, and in this house at least my mains is high in voltage and poor in waveform pretty much all of the time. The P10 keeps me pretty much immune from it. Is Passthrough better sound quality than removing the P10 completely ? Taking "passthrough" literally it must be the same, but I have a feeling it isn't....... |
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Post by MartinT on Dec 23, 2015 9:02:34 GMT
It's the same quaility as raw mains because it IS raw mains!
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Post by MikeMusic on Dec 23, 2015 12:51:59 GMT
So dead good for testing P10 against no P10 then without all the faffing with unplugging and mains blocks then ?
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Post by zippy on Dec 23, 2015 13:00:57 GMT
So dead good for testing P10 against no P10 then without all the faffing with unplugging and mains blocks then ? Unless they've cunningly tweaked the bypass to make it deliberately sound bad, so you think the P10 is really good.. Ho ho ho |
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Post by MartinT on Dec 23, 2015 13:41:39 GMT
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Post by MikeMusic on Dec 23, 2015 15:23:15 GMT
A passthrough mode is exactly what is needed on a UPS instead of dropping all power when the UPS fails. Have the T shirt for *that*
Another comparison, given time and a back allowing me to move properly and lift heavy kit around, is to compare
1. a P10 with a passthrough and
2. a mains block
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Post by MartinT on Dec 23, 2015 16:19:04 GMT
Don't forget the BMU. Awaiting your findings...
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Post by MikeMusic on Dec 23, 2015 18:09:49 GMT
I will have some strong bodies to help soon
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Post by dsjr on Dec 28, 2015 10:48:20 GMT
You mean you've sat on the thing for ages and not even tried it yet, when there are others out there who want a go?
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Post by MartinT on Dec 28, 2015 22:13:47 GMT
Dave, please don't jump in now. We're trying to sort the situation out and will get it back on the rails.
There are far too many people with opinions who don't know the facts.
Let's leave it and go back to discussing the BMU.
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Post by John on Dec 31, 2015 18:35:22 GMT
Mike has kindly sent me the unit I will hopefully plug it on Friday and feedback my thoughts at the weekend
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Post by dsjr on Dec 31, 2015 18:57:11 GMT
You could safely plug it in anywhere for the transformer to thermally settle after some time with carriers. Quite safe I promise you  |
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Post by John on Dec 31, 2015 21:15:49 GMT
When plugging in do I have to be careful I do not trip the electrics I know from past experience these things can draw a lot of current
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Post by dsjr on Dec 31, 2015 23:00:14 GMT
I don't think this one's an issue when not under load - nowhere for the current to go, so no inrush - he says with fingers and toes crossed...
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