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 61 
 on: May 23, 2016, 06:11:41 am 
Started by Scroobius - Last post by PeterSt
Hi Paul,

Thank you for sharing.
One remark which I think is unrelated, but related to the story itself anyway :

If you hear those clicks and pops from switching on/off consumers, you should have something else wrong. But hard to say where this can be. One source of that I have for you : the stereo itself. For example, detach a ground from an interlink and there you'll have it. Maybe not by guarantee, but by the experience I have myself with it (all coincidental). So :
In some earlier days of my music playback I worked a lot with detouring etc. grounds and I took the clicks for granted. Or I left off the light dimmers and such. Well, you know.
In my current system, at one day, I suddenly suffered from the same; This goes so unnoticed (so to speak) that you take it for granted (again). It sort of belongs to the job (never mind that it was away for 10 years). But this time I found a bad soldering in a connection ...

Very similar happens with poor solderings in again interlinks. Why interlinks ? because we tend to solder on them Wink). So no matter how hard you try, things start to buzz and hum when not layed out carefully (like routing them over a PC is not careful).
If I now ask Ciska to solder an interlink, the problems suddenly stay away and the interlinks are allowed to route through everything. swoon
Side note : remember those 3 organs I have ? one of them I built myself. A year of soldering ... But including my further soldering experiences, apparently not enough to do it really well. Ciska is just better at it ...

Of course we (you and me) are quite challenging with our 118dB sensitivity horns always at full gain. But, good thing, because at least we can hear it when something is wrong (to some degree).
Anyway moral : if I were you I'd find the source of the clicks and when solved go back to the trafo setup.

Regards,
Peter

 62 
 on: May 23, 2016, 05:52:52 am 
Started by Scroobius - Last post by PeterSt
Ramesh,

In my thinking, the DC Offset will be caused by the consumers itself - thus your own household apparatus and stereo. I am not sure whether that can be solved, although you can block the DC at the devices with humming transformer.
Real remedy should be a better tranformer ?

I don't know all about this, but I do know that I could always solve it with a better transformer. Plus there seems to be a limit on transformers to be hum free. Think like : when you have a transformer which is "larger" than 225VA it is prone to hum.
I once sorted out the topology of transformers (and what can hum (vibrate) and why) and it is not even easy matter.

To answer your question :
Yes, such a balanced transformer helps initially, but behind it you will "create" the same again. So it depends on whether the offset was already there in front of (the place of) that transformer.

Any better idea for mine !

Peter

 63 
 on: May 23, 2016, 01:37:38 am 
Started by Scroobius - Last post by briefremarks
Paul,

I've been thinking about getting one of the Goertz Audio balanced transformers in the hope of eliminating some DC offset in the power that sometimes causes my amp transformers to hum slightly.

Any thoughts on the Goertz Audio product?  Can balanced power eliminate DC offset or am I completely off-track here?

Ramesh

 64 
 on: May 22, 2016, 09:54:52 pm 
Started by Scroobius - Last post by Scroobius
A few months ago I removed the 1:1 mains balanced power supply transformer that sits between my hifi system and the mains supply. Why did I do this? well I remember Peter and Bert saying at some time in the dim and distant past that such transformers MAY reduce transient response. After all transformers with big winding's and the sheer physical size of them will for sure introduce inductance and also of course capacitance. Bad things for sure in a system this fast and responsive.

On removing the transformer I cannot honestly say that I noticed any real difference. That was a good enough reason to leave it out after all why have something installed that makes no difference?

The only problem was that during the day when lights were switched on and off and when motors and other electrical devices switched on or off the speakers clicked and popped. Not that loud and not a big problem really as they did not interrupt music listening. Anyway today I put the transformer back in line for the sole reason of getting rid of the occasional clicks and pops.

What is a surprise is just how good my system sounds again. The sound is just so silky smooth again - something that I did not appreciate was missing until today. So is this silky smooth at the expense of transients? absolutely not there are still great transients but without a layer of hash - almost at a sub conscious level. All I know is that I just do not want to turn the music off again.

Maybe balanced power is as fundamental as I thought it was originally when I first installed it - I just lost my way for a few months and now I can see the light again - anyway that is the way my ears are hearing it now.

And that is not all there is another change to be made this week when I start lifting floor boards to make further fundamental changes!!! watch this space!!

Cheers

Paul




 65 
 on: May 22, 2016, 05:24:52 pm 
Started by PeterSt - Last post by PeterSt
Hi Dave,

As a matter of fact it only this morning came to my mind that I forgot to mention that as a feature. So :

There will be a switch for that which by default connects PE and which thus also can disconnect PE;
I forgot because the day that bracket in the back (for the power inlet) was finished I disconnected PE with good result, but the hole for the switch just was not there yet (it still isn't, but will be in the production machines).

Peter

 66 
 on: May 22, 2016, 02:56:57 pm 
Started by PeterSt - Last post by music33
Peter, in the Eureka thread you mention the issue of PE affecting sound quality.  Did you solve it in the Mach II and if so is it by disconnecting it or some other means?  I ask as this is a significant design improvement in audio PCs.
Quote
Mind you ... that I have connected my devices' cabinets was not intended at all. As a matter of fact I only "dicovered" when I wrote the first post in this topic ...
(at this moment this is still so, but the PE in the PC is disconnected and sound was great again).

 67 
 on: May 22, 2016, 10:10:14 am 
Started by doublelife - Last post by PeterSt
I honestly never measured it. But some quick math tells me that it will be somewhere in between 3 and 5 Watts. This is outside PSU losses, so maybe add a Watt or 2.
Now double it to be on the safe side. Happy

If you really need to know precisely, I can measure it.

Quote
PSU number, groups

Sadly I don't understand what you mean by this. There are 2 PSU's in there, if that is what you mean. One for the DAC section and one for the USB interface.

Regards,
Peter

 68 
 on: May 22, 2016, 10:04:15 am 
Started by doublelife - Last post by PeterSt
Paul, I have one initial response only : Hurray !!!

Happy Happy Happy

 69 
 on: May 22, 2016, 10:02:57 am 
Started by doublelife - Last post by doublelife
Peter,

I can't find the on-board power spec for the NOS1a. Assuming it's not a trade secret of some sort, can you list it out for me please?
e.g. PSU number, groups etc.

P.S. Found a way to keep mine after all, so a very happy bunny.

Paul

 70 
 on: May 21, 2016, 09:02:34 pm 
Started by PeterSt - Last post by Scroobius
A clear varnish or clear topcoat ?


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