Indeed it is, X. 🙂
Only 10-12 ANs built ... that is a tragic waste of a great design. 🙁 Summer has arrived but I am still using my AN 4Rs because they sound so much better than my NAKSA 80s!
Andy
I have all the boards but life stuff means I have to prioritise my time elsewhere at the moment. The FQAs should be available again by February and that should hopefully coincide with me having some time to devote to the amp.
I want to try and make sure that I don’t miss anything when placing my order with Mouser and that includes minor hardware bits and pre-terminated wires etc. Compiling the order is not therefore a trivial undertaking !
I want to try and make sure that I don’t miss anything when placing my order with Mouser and that includes minor hardware bits and pre-terminated wires etc. Compiling the order is not therefore a trivial undertaking !
One FQA is missing in my order too, Mouser had no more. I put in an order for samples from ONsemi too, but they are out as well, but I figured they should be the first to have them..
My plan is to assemble with IRFP's first, and swap them later.
Some other small stuff was missing too, like some connectors, but I think I can get them locally, or even de-solder from some old computers I have..
My plan is to assemble with IRFP's first, and swap them later.
Some other small stuff was missing too, like some connectors, but I think I can get them locally, or even de-solder from some old computers I have..
I build the AN39 amp while ago and i like it. But i have already too many amps, so it gets used less often that it should.
A true shame since most Class A amps transition to AB at high output, this one remains class A until clipping so you hear you bass heavy notes in class A. This combined with the high damping make for some pretty solid kick. The layout makes it pretty versatile to alternative builds.
Bill
Bill
In my case, I use classA amps only from 150Hz up. Most of my systems are biamped now, so I do not need big ClassA amp to provide much power, just few watts, no need to drive power hungry woofers either. So I am making it easy for ClassA amp, this way they can sound sublime. And it gives me more flexibility.
For those who wanted to see my build steps, here's where I posted them. It is a French forum but I've included the Goggle translate
Amplificateur Classe A, Alpha Nirvana
Googly translation
Amplificateur Classe A, Alpha Nirvana
Amplificateur Classe A, Alpha Nirvana
Googly translation
Amplificateur Classe A, Alpha Nirvana
@zman01, @XRK,
Thanks! the amplifier is actually mostly completed and is playing music now. Only problem is the transformer humming very loudly, so I cannot concentrate on the music... The replacement transformer was supposed to be delivered today, but FedEx reported "operational delays", so it should be delivered next Tuesday... I will post newer pictures shortly. With this amplifier 4 ohms version biased @ 3A, the heatsink get to ~55 Celcius... A little hot, but still good.
@Studley,
For the chassis, a friend of mine (Vitalie on this forum), got them for me about 2-3 years ago... It was a special order. There are some similar chassis (heatsinks) on AliExpress, but not exactly like these though.
Do
Thanks! the amplifier is actually mostly completed and is playing music now. Only problem is the transformer humming very loudly, so I cannot concentrate on the music... The replacement transformer was supposed to be delivered today, but FedEx reported "operational delays", so it should be delivered next Tuesday... I will post newer pictures shortly. With this amplifier 4 ohms version biased @ 3A, the heatsink get to ~55 Celcius... A little hot, but still good.
@Studley,
For the chassis, a friend of mine (Vitalie on this forum), got them for me about 2-3 years ago... It was a special order. There are some similar chassis (heatsinks) on AliExpress, but not exactly like these though.
Do
Oh yes, this is very special Do!
Beautifully laid out too, so very important with lots of hot parts on a Class A.
Lovely metal work, you are an artisan!
Merry Xmas to you and your family, lets hope you all enjoy your Xmas music!
And again, thank you for the leap of faith, much appreciated from all involved.
Hugh
Beautifully laid out too, so very important with lots of hot parts on a Class A.
Lovely metal work, you are an artisan!
Merry Xmas to you and your family, lets hope you all enjoy your Xmas music!
And again, thank you for the leap of faith, much appreciated from all involved.
Hugh
This one is similar but not as pretty when in black anodized vs clear.
NEW KSA 250 KRELL appearance CNC Full aluminum amplifier chassis/case BOX DIY 480mm*215mm*520mm|aluminum amplifier chassis|amplifier chassisamplifier aluminum chassis - AliExpress
NEW KSA 250 KRELL appearance CNC Full aluminum amplifier chassis/case BOX DIY 480mm*215mm*520mm|aluminum amplifier chassis|amplifier chassisamplifier aluminum chassis - AliExpress
Thanks Hugh!
I’ve heard your amps a few times, it wasn’t that hard to trust you on this build! 😉
Merry Christmas to you as well!
Do
I have been trying to run some tian sims on the AN, but I must be doing something wrong. I have done this on a number of amps, but this one I can't get to work.
Pics of the sim and plot attached, and I also attached the sim with models etc in the zip.
Could somebody take a look?
Components arrived from Mouser the other day, waiting for the boards now.
Pics of the sim and plot attached, and I also attached the sim with models etc in the zip.
Could somebody take a look?
Components arrived from Mouser the other day, waiting for the boards now.
Attachments
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I don't understand what the graph is telling me, Hugh???
The AN FR has a pronounced LF hump?
Andy