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Old 1st August 2016, 03:27 AM   #21
seano is offline seano  Australia
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Nice...and good to see the NAKSA get improved without costing a brick tonne more. Congratulations! That said...I'm not sure I'll be moving on up at this stage from our well used NAKSA.

I've still got my 100N+ to a new home...and my not quite finished GK2 remains not quite finished and it should probably go to someone who will [sigh]

Question though. I run my NAKSA with a passive stepped attenuator on the output. Presumably I can do the same with the newbie?
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Old 1st August 2016, 03:49 AM   #22
AKSA is offline AKSA  Australia
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Hi Seano,

Thank you for your post, I hope in Mildura continues nicely, and that you had plenty of rain and not too cold..... vines doing nicely?

The SAKSA has a couple of advantages over the NAKSA. Bass, quiet at idle, deeper and wider image depth, warmer and engaging. It is also more robust, and will take 50V rails to deliver 120W, and I would expect to have no failures at any time over decades.

A stepped attenuator is just fine and I offer one as an option if people buy the case as well. I've designed all my last seven years to run straight from a digital source, no preamp.

Ciao,

Hugh
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Old 1st August 2016, 04:42 AM   #23
seano is offline seano  Australia
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All good here...

So...can the NAKSA module on its heatsink simply be swapped out of the case for the SAKSA module on its heatsink and use the same transformer?
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Old 1st August 2016, 05:05 AM   #24
AKSA is offline AKSA  Australia
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Yes, Seano, I designed it for identical pinout and R&R!

Same toroid, same heatsink requirement, just the same........!

Cheers,

Hugh
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Old 1st August 2016, 11:12 AM   #25
acidbrain is offline acidbrain  Netherlands
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Brand New Super AKSA - the SAKSA 85!
Within a few hours Hugh announces that we kan exchange our beloved Naksa 80 for a Saksa 85 + extra costs of course ! disclaimer >wishful thinking


Quote:
Originally Posted by AKSA View Post
Yes, Seano, I designed it for identical pinout and R&R!

Same toroid, same heatsink requirement, just the same........!

Cheers,

Hugh

Last edited by acidbrain; 1st August 2016 at 11:25 AM.
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Old 1st August 2016, 12:09 PM   #26
AKSA is offline AKSA  Australia
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Eric,

Do not give up your NAKSA 80. It is a fantastic amp. I would not spend the money to replace with the SAKSA 80 until you have very good value from your NAKSA 80 and even then I would sell your NAKSA 80 to recover some of your investment first. I did not design it to replace it; I designed it to see if I could do any better. I suffer from OCD; I cannot come up with new ideas unless I redesign an amp; it is my tragedy but it is a good way to spend your bonus years in your dotage.........

We are dealing with marginal improvements. Unless you hear a SAKSA you would never know.......

Ciao,

Hugh
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Old 1st August 2016, 12:16 PM   #27
acidbrain is offline acidbrain  Netherlands
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Brand New Super AKSA - the SAKSA 85!
Hello Hugh,

Last week I installed a burglar alarm in my house, nobody comes between me and my Naksa ! I wish you a lot of ingenieus ideas & good health.

Erik

Last edited by acidbrain; 1st August 2016 at 12:44 PM.
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Old 1st August 2016, 12:16 PM   #28
meanman1964 is offline meanman1964  Belgium
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Hugh,I also like the idea to tweak an amp to get an other sound color because nothing is more personal than how you hear and like your sound
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Old 1st August 2016, 12:58 PM   #29
AKSA is offline AKSA  Australia
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Erik, Patrick,

The SAKSA input stage came to me from a good friend in Vancouver, Canada. He used a LTP input stage and VAS with a preamp, and told me it was wonderful. I studied it for a few weeks, mostly on LTSpice, and then decided to adapt it for a power amplifier. I made a couple of very significant changes to it; the drive of the voltage amplifier, and the stability regime. I then laid out the pcb (this is the best aspect of design for me, I love the art and engineering in a good layout), it was the built by a more energetic English friend here in Melbourne, and when it came up trumps (??!) I decided to polish the pcb further and then commit to producing 25 at an component assembler here in Melbourne. This is a long gestation, it takes about three more weeks to complete all the documentation (schemat, pcb layout and bill of materials, down to the catalogue numbers for each and every part) and then another 10 weeks to get the parts purchased at reasonable price and then assembled. About two weeks back I picked up the first batch, and after careful listening, I made a few dimensional changes to refine a good amp into a masterpiece, and then handed all the 25 modules back to another guy, another friend of mine with lots of skill in smd components, to change the four components to what I had discovered.

One of the problems I had with the NAKSA was this: With bad recording (that is, around 90% of most in the market!) it did not sound wonderful. All the problems were very obvious; you wince each time you listen to a crappy CD. I wanted an amp which would deliver immortal performance with outstanding recordings, but at the same time deliver a very enjoying sound even with a bad recording. This has eluded me with most designs, except the Glass Harmony from 1994, the Maya in 2015, and again the SAKSA 85.

I have come to see that audio is the entertainment for the people, but nothing is as boring than a zero THD, full global feedback amp design from a genius. I have tried with my designs over many years now to combine engineering with an understanding of music and harmonic structure, and how the human being perceives music. This music issue is so complex it is beyond measurement - not even a symphonic score can do this. We have to come back to our hearing, and trust our own perceptions. I have noticed that when people are highly educated and trained in logic they generally forget the detective clues that I have found seem to work very well with good amp design. This is anti-genius work; it is almost a return to primordial thinking. Perhaps because I am a simple country boy at heart, but in fact I was trained as a pipe organist as a young man at boarding school and it left its mark on me. Oddly enough my hearing is terrible, but I am very sharp with amps if I turn up the wick to blinding levels!!

Ciao,

Hugh
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Last edited by AKSA; 1st August 2016 at 01:04 PM.
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Old 2nd August 2016, 06:17 PM   #30
zman01 is offline zman01  Bangladesh
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Hugh,

Thank you for sharing some background on the SAKSA amplifier, as well as your design philosophy. Love the determination and conviction you have in bringing good sounding amplifiers to music lovers.

If not prying too much, may I ask what speakers you use/prefer?

- Zia
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