Aussie Amps NX500NL

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#2
I can't tell if they are Class D or AB from the pictures. . .I suspect
they are Class AB. . .someone has used them though. . .give it some
time. . .certainly scant info on the web.

Maybe write to them and see if they will let you contact current
customers. . . someone other than the company that uses them?

Good luck.
 
#5
Would you believe that some people of this club are familiar with Anthony Holton's designs for well over a decade ?

JV
Brown Nose Industries.
 

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#7
I know Anthony reasonably well, and value his experience and opinion. He is a very nice guy, and this is lonely work, and credit is due his designs.

Sadly I have heard only one of his amps, an early NX series. Damn good too. We have discussed many amp design issues over coffee and I have particular respect for his skills with mosfet design; he knows mosfet cross-conduction and HF operation better than anyone else I've met.

In fact, in an amusingly guarded way we even discuss our designs!!

There are enough customers in the world to keep us both in daily bread if our products are good enough..... and some collaboration improves the products, no question.

Cheers,

Hugh
 
#9
I dont know which personal devellopment Anthony has gone through, but clearly something has happened, and I think it is clearly seen in his new deigns, which look much better and more "mature" than his "older" ones ... I am quite confident that they are good solid designs

There may be an issue with handling mosfets with regards to earthing your work area to deal with "statics" ... I am no expert, but it might be better to buy assembled boards ... some oppinions on this aspect would be nice, if it really is an issue 🙂
 
#11
As a kit there is limited quality control because of the workmanship, and thus results are not always predictable. There is also very considerable service backup.

Therefore the business model for kits is on the edge of viability, and so purchase of modules may be the only way to go if you want guaranteed high quality and warranty.

Cheers,

Hugh
 
#12
#13
Workhorse said:


Hugh
Have a look at this thread and confirm who told Anthony about the exact phenomena of Cross-Conduction in Mosfet amps and also that his modules were suffering from Cross-conduction at HF😀

http://www.diyaudio.com/forums/showthread.php?s=&threadid=5447&perpage=50&pagenumber=3

best regards,
K a n w a r
Click to expand...


you may have told him but that doesn't mean everything he knows about it came from you.....he could have done some research (and experimenting) of his own. 😉
 
#14
Kanwar,

I am sorry - I did not mean to discount your good advice!!

Your circuits have impressed me greatly, Kanwar, you are 1 very smart guy. That mosfet drive circuit is one of the cleverest things I've seen, up there with the NP-PMA concept.

However, I could crawl behind semantics and suggest that I have met Anthony - but I have not yet met you!!! :bawling:

Ciao,

Hugh
 
#15
djQUAN said:
you may have told him but that doesn't mean everything he knows about it came from you.....he could have done some research (and experimenting) of his own. 😉
Click to expand...

Mr. DJ,
I have used the word "TOLD" not "TAUGHT" in my previous post. which states clearly that i just describe Anthony that his modules were suffering from Cross-Conduction at HF.......
Quan you are dragging my statement towards wrong path, Stop this blasphemy.:bawling:


AKSA said:
Kanwar,
I am sorry - I did not mean to discount your good advice!!
However, I could crawl behind semantics and suggest that I have met Anthony - but I have not yet met you!!! :bawling:
Ciao,
Hugh
Click to expand...

Hello Hugh,
You misunderstood my pevious post, i have no intention for disrespecting anyone.I hope we shall meet someday and have dinner together.😉
Cheers Major
 
#19
Mmm. The issue of cross conduction or gm doubling has had reasonable press in many forum threads so it's surprising that there's still a rather divided consensus of opinion.
In my playing with complimentary output stages I'm resigned to the fact that it can't be fully eliminated. However, it's my view that the resulting distortions are perhaps easier to deal with than pure crossover distortion, and perhaps even rail induced distortions.

One fact that seems to be ignored is that in the real world where a typical wideband musical signal is applied to a class AB amplifier, the large signal LF component serves as continuously varying bias signal for the more critical high frequency end of the spectrum. The implication of this is that the setting of a quiescent bias point is far more important for the reason of cross conduction than it is for crossover distortion.

However, let it not be ignored that a VAS with a very low output impedance is not that difficult to design and serves as a good way to eliminate most of the ill effects of cross conduction.
IMO, Attempting to reduce cross conduction or crossover distortion with elaborate temperature compensated bias generators is a big waste of time because it's virtually impossible to achieve at high frequencies which is where you really need it.
 
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