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Naim style rectifier: why?

Complete and utter bollox. You shouldn't be allowed to post on forums with lies like that.

I am sorry, but I also didn't believed it until I actually heard it. The mains wires in my appartment were pieced on every couple of meters, and at each junction there were devices connected to wall sockets etc etc., the usual mess. Wiring in an independent and uninterrupted supply from the fuse box to the audio wall socket made a difference comparable to upgrading from a Nait3 to a NAC52/NAP250 on the old supply (which ironically backups well your own opinion as I understand it). And the guitar amps sounded way more natural, deeper, cleaner, faster. Interestingly a new mains wiring costs way less than upgrading the amps.

The whish to prohibit posts about my personal experience / opinion would be not exactly the most democratic whish I gues...? And you want to decide that what I wrote is a "lie"...?
 
I am sorry, but I also didn't believed it until I actually heard it. The mains wires in my appartment were pieced on every couple of meters, and at each junction there were devices connected to wall sockets etc etc., the usual mess. Wiring in an independent and uninterrupted supply from the fuse box to the audio wall socket made a difference comparable to upgrading from a Nait3 to a NAC52/NAP250 on the old supply (which ironically backups well your own opinion as I understand it). And the guitar amps sounded way more natural, deeper, cleaner, faster. Interestingly a new mains wiring costs way less than upgrading the amps.

The whish to prohibit posts about my personal experience / opinion would be not exactly the most democratic whish I gues...? And you want to decide that what I wrote is a "lie"...?

Belief in mains cable related issues is just as bat shit crazy as Qanon and 5g mast conspiracies. You obviously have zero knowledge of my opinions also.
 
I ask again: did you try what I descibed? Can you hear a difference between 2 amps? If yes: your opinion would be that an amp can make a difference. Any part in an amp has properties sich as inductance, capacitance, resistance, even a piece of wire has. A wire link would be a "part" with a very low resistance for example. And neighbouring wire links, tracks, parts could influence each other. Please educate me: am I lying? If not your opinion should be it's impossible that a cable doesn't make a difference. If you can't hear the difference, well that's another story :cool:
 
Belief in mains cable related issues is just as bat shit crazy as Qanon and 5g mast conspiracies. You obviously have zero knowledge of my opinions also.

Unless you have double blind listening test results to back that statement up against this carefully presented and specific personal opinion Jez, then your assertions are nothing more than your own generalised opinions that resemble a Trump rant. Have you checked out Andrew Weekes posts here on the subject of mains power and dedicated spurs for example?

I for one would value your considered findings that back up your opinions better than ours rather than such tiresome dogma.
 
Have you checked out Andrew Weekes posts here on the subject of mains power and dedicated spurs for example?

There is one HELL of a difference between suggesting merit in a dedicated spur and suggesting that 2-3 feet of cable between socket and kit make a difference.
I say that making no comment beyond EXACTLY what I have just written.
 
There is one HELL of a difference between suggesting merit in a dedicated spur and suggesting that 2-3 feet of cable between socket and kit make a difference.
I say that making no comment beyond EXACTLY what I have just written.

Agreed, but the principles are the same for both are they not and it is just a question of the amount of common mode interference.
 
Unless you have double blind listening test results to back that statement up against this carefully presented and specific personal opinion Jez, then your assertions are nothing more than your own generalised opinions that resemble a Trump rant. Have you checked out Andrew Weekes posts here on the subject of mains power and dedicated spurs for example?

I for one would value your considered findings that back up your opinions better than ours rather than such tiresome dogma.

There is no way that mains cables, spurs etc etc can have any effect whatsoever under any circumstances. Plugging 10 extension leads one into the next would have no effect. It is complete arse gravy and I regard anyone who believes in it as... well, to stay within AUP I'll just say completely misguided. No I have not checked out anything on the matter by Andrew Weekes and would have thought him more sensible than that.
I do not regard it as something one can hold an opinion about. It is simply wrong.
Probably best leave it there as I have VERY strong feelings about the way engineering is brought into disrepute by such claims.
 
Jez, I once correctly stated which mains cable was being used 6 times in a row. I even said what sounded different and used that as a reference.

Two cables were used and I could not see and did not know which one was in use.
 
I built a pair of 135 clones and used twin bridges, I rewired them to a centre tap and single bridge and they sounded a lot better.

I now only use a centre taped transformers in psus.


Pete
 
All in your mind of course.
The simple fact of doing something tells the brain there is a change.
The mind’s power of self-conviction is amazing.
Audiophilia would make an excellent case study for specialists of the mind.
Wine is another good example.

By the way, have you ever seen the tiny leads inside a semiconductor? Or a valve for that matter.
How can music flow through those I wonder :rolleyes:
 
I built a pair of 135 clones and used twin bridges, I rewired them to a centre tap and single bridge and they sounded a lot better.

I now only use a centre taped transformers in psus.


Pete

Interestingly I did the same thing but the opposite way round, from single to twin bridges, on my HackerNAP, and concluded that I preferred the twin bridges approach. I've also done the switch both ways round with DAC's, preamps and headphone amps because I am trying to evade the additional size and expense of the inefficient dual bridge approach but each time I have confirmed that I prefer the dual bridge approach. Obviously that doesn't make me correct. Perhaps it makes me slightly opinionated even? I would love a definitive answer with proof. I promise that I would accept either outcome, but for now I can only follow my ears.

However, in the absence of proof I won't accept that my conclusion is nonsense, and nor should you.

John
 
Mmmm at least a difference was noticed.
Densen use dual bridges and I like their amps.

I still think it has a lot to do with the 0v returns.

Pete
 
I still think it has a lot to do with the 0v returns.

Pete

I agree.

At diode switching the the current surge is a fast transient followed by ripple. If a snubber isn't used to limit the speed of the transient and damp it then it is the (0v) paths back to the transformer and their impedance which will determine the damping and frequency of the transient and ripple. The loop area of the returns and the size and length of the copper paths back will all make a difference. The 0v returns from the amp and speakers also have to be carefully designed and separated while minimising loop areas. The HackerNAP wiring document shows a good example of this.

I think changes to all of this can be audible. We can't eliminate the issues but we can ignore them, ridicule them or put them in the "too difficult" box. Preference, well that could come down to small differences in implementation and even personal taste!
 
I have another question regarding the Naim rectifier topology: it was mentioned that half of the transformers power would be wasted, so what about using the unused half for powering a second set of rectifiers / caps, for example to power the other channel or to separate power for front end and power stage? Are there any downsides? If we forget about cost and space requirements for a moment: is there any difference between A and B in the following diagram other than "wasting" half of each transformer in B (and of course separate GNDs)?

GBal4Nf.png
 
Yes, the VA related questions are covered. But this thread is about why Naim prefers the circuit shown in the first post. And my last question in #37 was: since half of the time no load is connected to the secondaries, what kind of difference would it make to connect another load to the "unused" half? Naim used it for the logo LEDs only...
 
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I think it’s the same question, but phrased in a different way. Instead of also powering the front end, what if you used it to power another power-amp’s back end? Martin’s argument says you wouldn’t get twice the power from that same transformer.
 


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