No, the bias won't affect it to this extent, if anything will improve the bass.
I have seen instances where these NX series caps, and the standard series 100uF on the bootstrap, take up to 150 hours so I would say that a bit more time might be good.
I should add that speaker positioning has profound influence on bass response, so take care that you replicate the original position as room issues below 200Hz are pivotal.
Hugh
I have seen instances where these NX series caps, and the standard series 100uF on the bootstrap, take up to 150 hours so I would say that a bit more time might be good.
I should add that speaker positioning has profound influence on bass response, so take care that you replicate the original position as room issues below 200Hz are pivotal.
Hugh
AKSA said:
And that goes for listening position as well.
This reminds me of the day the big guy in the corner office called and told me the screen on his new laptop just went all pale and fuzzy. I went and looked but I couldn't really tell what the screen looked like because the sun was glaring on it through the window. I shut the blinds so I could get a better look, and boss shouted "It's fixed! What did you do?"
..Todd
Professor has sent me mails..and he was worried about that
small difference in bias...also small difference in off set.
I told him the off set was adjusted into your supply Hugh...in his supply, with differences of voltage from positive rail to negative rail voltages this can produce some offset.
Also i said him the bias difference was because you may have tuned the bias point watching the crossover into the scope.
If you wanna know what i think about i will tell ya.
It seems to me professor thinks his amplifier is out of order because this sligth off set variation..also the bias point...so...he is loosing the confidence into the amplifier...when some folks thinks this way, they will start to perceive negative things into the audio performance because of those values measured differently than the specifications..and you observe that Professor is perfectionist... when you said 60 miliamps he will feel bad with 61 or 59 miliamps.
I think he is "feeling" the amplifier strange...this is entirelly psychological..when we feel this way..we "listen" this way too.
We are not only ears...we are ears plus brain plus heart... we are a wonderfull system that uses to fool us from time to time.
If was different than that no one got married..because it is not clever to give up related all the women you can have in this world to be married with a single one.... people fooled themselves thinking "that" woman is the perfect one.... mind made.... this is what we do all time long...because a lot of reasons happens this way.
Mr Professor is perceiving things that cannot even be real...better to take the amplifier back to adjust bias into 60 miliamperes and provide him a trimpot to adjust off set.... or he will continue to feel this way.
regards,
Carlos
small difference in bias...also small difference in off set.
I told him the off set was adjusted into your supply Hugh...in his supply, with differences of voltage from positive rail to negative rail voltages this can produce some offset.
Also i said him the bias difference was because you may have tuned the bias point watching the crossover into the scope.
If you wanna know what i think about i will tell ya.
It seems to me professor thinks his amplifier is out of order because this sligth off set variation..also the bias point...so...he is loosing the confidence into the amplifier...when some folks thinks this way, they will start to perceive negative things into the audio performance because of those values measured differently than the specifications..and you observe that Professor is perfectionist... when you said 60 miliamps he will feel bad with 61 or 59 miliamps.
I think he is "feeling" the amplifier strange...this is entirelly psychological..when we feel this way..we "listen" this way too.
We are not only ears...we are ears plus brain plus heart... we are a wonderfull system that uses to fool us from time to time.
If was different than that no one got married..because it is not clever to give up related all the women you can have in this world to be married with a single one.... people fooled themselves thinking "that" woman is the perfect one.... mind made.... this is what we do all time long...because a lot of reasons happens this way.
Mr Professor is perceiving things that cannot even be real...better to take the amplifier back to adjust bias into 60 miliamperes and provide him a trimpot to adjust off set.... or he will continue to feel this way.
regards,
Carlos
Man, Carlos please, you sound like a salesman in the jam
But ofcourse, what you say is not all wrong either
Just buying a good amp may not get you to nirvana, despite what the salesmen say
A lot of other things matters as well
But its important to notice that he has experienced the sound being much better
And I dont think thats imaginary
But what has made the change is impossible to say, just like that
Did this change happen AFTER moving things around, or ?
But ofcourse, what you say is not all wrong either
Just buying a good amp may not get you to nirvana, despite what the salesmen say
A lot of other things matters as well
But its important to notice that he has experienced the sound being much better
And I dont think thats imaginary
But what has made the change is impossible to say, just like that
Did this change happen AFTER moving things around, or ?
Prof
What you are hearing is very real and maybe similar to my experiences. I built my first AKSA 55 in 2004 and shortly after did the N+ mod. The sound as you have mentioned became very erratic and at that stage could have thrown the amp away. After advice from Hugh I did stick it out and it came good after 150+ hours and worked fine after that. I even went through a process of using a cap rack on the BG before the parts went in but didn't work for me. I still had to go through the pain.
My subsequent builds on Hugh's PCBs of the AKSA 55N and 55N+ do not use the BG standard at C4 and went straight to Nichicon KZ 100uF 50V. I also replaced that cap on my LF55 with a Nichicon KZ. Both amplifiers benefitted greatly from this change and have never used a BG standard in this location since.
Beg, borrow or steal a pair of these caps and swap out C4.... your ears will thank you. I believe the Elna Silmics are supposed to be similar and a Nichicon FG could work here as well which has already been mentioned. The rest of the electrolytics in mine are Nichicon FG.
http://www.minisemi.com/Nichicon Muse capacitors.html
BTW.... the AKSA 55N+ is still used as my main amplifier and is 1 of the 2 DIY amps that remained with all others being turfed out.
What you are hearing is very real and maybe similar to my experiences. I built my first AKSA 55 in 2004 and shortly after did the N+ mod. The sound as you have mentioned became very erratic and at that stage could have thrown the amp away. After advice from Hugh I did stick it out and it came good after 150+ hours and worked fine after that. I even went through a process of using a cap rack on the BG before the parts went in but didn't work for me. I still had to go through the pain.
My subsequent builds on Hugh's PCBs of the AKSA 55N and 55N+ do not use the BG standard at C4 and went straight to Nichicon KZ 100uF 50V. I also replaced that cap on my LF55 with a Nichicon KZ. Both amplifiers benefitted greatly from this change and have never used a BG standard in this location since.
Beg, borrow or steal a pair of these caps and swap out C4.... your ears will thank you. I believe the Elna Silmics are supposed to be similar and a Nichicon FG could work here as well which has already been mentioned. The rest of the electrolytics in mine are Nichicon FG.
http://www.minisemi.com/Nichicon Muse capacitors.html
BTW.... the AKSA 55N+ is still used as my main amplifier and is 1 of the 2 DIY amps that remained with all others being turfed out.
So... there's the correct answer...Rabbitz have perceive that
He is tuned to details... a very skilled man related amplifiers and to produce speakers.
If he said that..so it is.
regards,
Carlos
He is tuned to details... a very skilled man related amplifiers and to produce speakers.
If he said that..so it is.
regards,
Carlos
Thanks to all that replied.
Carlos, what you say is true about me being a perfectionist and that could be affecting the sound I hear.
Rabbitz could you state your email please so that we can talk about this more?
Carlos, what you say is true about me being a perfectionist and that could be affecting the sound I hear.
Rabbitz could you state your email please so that we can talk about this more?
tinitus said:
Well at first I was careful NOT to change the speaker positioning but then I started to percieve a lack of bass and dynamics and sounstage so I lost my patience and was forced to move the speakers around. But I have not managed to get the sound back despite moving them around.
rabbitz,
I wonder what is the other DIY amp that you help? Aussie Amp?
http://www.aussieamplifiers.com/peterjamp.htm
I wonder what is the other DIY amp that you help? Aussie Amp?
http://www.aussieamplifiers.com/peterjamp.htm
I have already received and sent you many E mails Professor.
Also Hugh told me have received and sent an enormous quantity of E mails too.
I think it is enougth for a while.
bye, bye.
regards,
Carlos
Also Hugh told me have received and sent an enormous quantity of E mails too.
I think it is enougth for a while.
bye, bye.
regards,
Carlos
Member
Joined 2009
Paid Member
Thanks for some good postings, Carlos.
As you have some AKSA amplifiers you are intitled to give us some info.
And you know Hugh very well ... better than me 🙂
I did not say Professor Smith was imagine-ing things.
I only asked if he had considered the subjective 'illusive' factor, as well.
Kids,
we should not distrust any sound impressions we get, as being Extra ET Terrestrial encountering.
Many times our Ear are telling us reality.
When I now, no longer, can hear my mother's voice with that lovely mother's tone
this is a mattare of fact.
As she is Knocking from a wooden box in the ground
onto Heavens Door.
And Bob Dylan + Eric Clapton will really Knock On Heavens Door, some day, too
http://www.youtube.com/watch?v=hh4WwCzjtL4
Clapton's live version 🙂 🙂
Regards to brasil
I see you are feeling well and is happy and okay now Carlos M.
Sometimes we fight, but we will never forget old love.
Like them old halojoy + destroyer days ... before 'lineup' had to sneak in
Thanks
your Swedish friend
🙂 - - - - Don't Worry - - - - Be Happier!!! - - - 🙂
POSI TIVE VI BRA TION ... Yeah - - - - Posi Tive
http://www.youtube.com/watch?v=ym4s9F4adDw
... I & I vibration 🙂 positive !!! ...
If you get down and quarrel everyday
You're saying prayers to the devil, I say
Why not help one another on the way
Make it much easier
Say you just can't live that negative way
You know what I mean
Make way for the positive day
Cause it's a new day
New time, new feeling yeah!
Say it's a new sign
Oh what a new day
As you have some AKSA amplifiers you are intitled to give us some info.
And you know Hugh very well ... better than me 🙂
I did not say Professor Smith was imagine-ing things.
I only asked if he had considered the subjective 'illusive' factor, as well.
Kids,
we should not distrust any sound impressions we get, as being Extra ET Terrestrial encountering.
Many times our Ear are telling us reality.
When I now, no longer, can hear my mother's voice with that lovely mother's tone
this is a mattare of fact.
As she is Knocking from a wooden box in the ground
onto Heavens Door.
And Bob Dylan + Eric Clapton will really Knock On Heavens Door, some day, too
http://www.youtube.com/watch?v=hh4WwCzjtL4
Clapton's live version 🙂 🙂
Regards to brasil
I see you are feeling well and is happy and okay now Carlos M.
Sometimes we fight, but we will never forget old love.
Like them old halojoy + destroyer days ... before 'lineup' had to sneak in
Thanks
your Swedish friend
🙂 - - - - Don't Worry - - - - Be Happier!!! - - - 🙂
POSI TIVE VI BRA TION ... Yeah - - - - Posi Tive
http://www.youtube.com/watch?v=ym4s9F4adDw
... I & I vibration 🙂 positive !!! ...
If you get down and quarrel everyday
You're saying prayers to the devil, I say
Why not help one another on the way
Make it much easier
Say you just can't live that negative way
You know what I mean
Make way for the positive day
Cause it's a new day
New time, new feeling yeah!
Say it's a new sign
Oh what a new day
I am very sorry to know about your mum .
....really very sorry.
Well... this is life... i also have lost mine.
You were and continue to be a very interesting guy.... unfortunattely we use to crash sometimes.
But i can crash monday and laugh on tuesday...i use to have a very good mood... and not to feed hate in my heart...i just keep distance to the ones use to annoy me. (alike everybody..nothing special i think)
To drive me out from my mind is when i see bad intentions, things published to burn some friend good image of respectability ... guys trying to send mud into my friends...i am glad you have never did such things.. i am not complaining about you... you and your friend Halojoy have never made such kind of bad things....if i can remember well.
Send Halojoy my best regards and a friendly hug...he is a very nice swedish man
Carlos
....................................................................................................
....really very sorry.
Well... this is life... i also have lost mine.
You were and continue to be a very interesting guy.... unfortunattely we use to crash sometimes.
But i can crash monday and laugh on tuesday...i use to have a very good mood... and not to feed hate in my heart...i just keep distance to the ones use to annoy me. (alike everybody..nothing special i think)
To drive me out from my mind is when i see bad intentions, things published to burn some friend good image of respectability ... guys trying to send mud into my friends...i am glad you have never did such things.. i am not complaining about you... you and your friend Halojoy have never made such kind of bad things....if i can remember well.
Send Halojoy my best regards and a friendly hug...he is a very nice swedish man
Carlos
....................................................................................................
An externally hosted image should be here but it was not working when we last tested it.
Gareth,
Peter has both, and prefers the LF for orchestral and the AKSA for jazz.
An amp for all seasons.....
Cheers,
Hugh
Peter has both, and prefers the LF for orchestral and the AKSA for jazz.
An amp for all seasons.....
Cheers,
Hugh
Member
Joined 2009
Paid Member
This is a perfect idea. When my wife asks why I need to make another amplifier, I can explain why 😀
Just out of interest what would the resell value of my aksa 55n+ be like in the event that I decide to sell it in future?
It has been put into a standard 2U case. But if it doesnt sound good after a while, selling is the only option. If that fails, then its been a very expensive experiment in building this amp.
It has been put into a standard 2U case. But if it doesnt sound good after a while, selling is the only option. If that fails, then its been a very expensive experiment in building this amp.
Professor smith said:
Hi Professor smith,
Because of your posts you'll be lucky to give it away.
If you decide to pull it to pieces, I don't mind taking the amp boards off your hands.
BTW: I use a AKSA 55N+ and its one of the best amps I have heard. I've got lots of other amps in my cupboards that didn't come up to scratch.
regards
Kenji,
I don't believe you are being honest here. Let me remind you of what you wrote me on 8th May:
"The imaging: Not just depth but central, width, height it's all very well defined.
The bass: Tight and deep, I am surprised given what other people have said about it lacking.
The dynamics: much more than before.
Going through all my cds I am hearing a 'new sound' with each recording, whereas with my previous amp, EVERY cd sounded 'the same'. This is also significant and surprising..."
IOW, it HAS sounded magnificent, but you have since changed your source, DAC and preamp. You refuse to accept that there is a long bedding in period for these caps, and you won't entertain that the different source might have something to do with it.
Since you heard such a wonderful sound before (and you were evidently very happy), you have changed the source, the DAC and the preamp, and the amp may have then gone into it's hibernation due to the caps bedding down. Others have confirmed this is what happens, not just the designer. This talk of selling it because it's no good gives entirely the wrong impression about the product and is, in my view, mischievous. You negotiated a very long dialogue with me - 60 emails no less - I suggest to you that I have shown good faith throughout and now you are attempting to blacken the reputation of the product for spurious, dubious reasons.
I believe the amp stands on its reputation and your posturing here is both invalid and unjustified.
Hugh
I don't believe you are being honest here. Let me remind you of what you wrote me on 8th May:
"The imaging: Not just depth but central, width, height it's all very well defined.
The bass: Tight and deep, I am surprised given what other people have said about it lacking.
The dynamics: much more than before.
Going through all my cds I am hearing a 'new sound' with each recording, whereas with my previous amp, EVERY cd sounded 'the same'. This is also significant and surprising..."
IOW, it HAS sounded magnificent, but you have since changed your source, DAC and preamp. You refuse to accept that there is a long bedding in period for these caps, and you won't entertain that the different source might have something to do with it.
Since you heard such a wonderful sound before (and you were evidently very happy), you have changed the source, the DAC and the preamp, and the amp may have then gone into it's hibernation due to the caps bedding down. Others have confirmed this is what happens, not just the designer. This talk of selling it because it's no good gives entirely the wrong impression about the product and is, in my view, mischievous. You negotiated a very long dialogue with me - 60 emails no less - I suggest to you that I have shown good faith throughout and now you are attempting to blacken the reputation of the product for spurious, dubious reasons.
I believe the amp stands on its reputation and your posturing here is both invalid and unjustified.
Hugh
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