increrible aleph5 tiuning!! - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st March 2005, 01:42 PM   #1
diyAudio Member
 
elviukai's Avatar
 
Join Date: Apr 2003
Location: EU- Electronic Union country
Thumbs up increrible aleph5 tiuning!!

hello guys outhere. I have built till now about 12pieces aleph 3/5/60/zen v4. some sounds beter some less better. I noticed that mainly sound of the depends on PS Filter caps. one day I did experiment (as have some spare parts laying without job )I builld folowing power suply for aleph 5- total capacistance 286 000uf cossisting on mixed caps. panasonic 47 000, philips 22 000, 6800, elna 4700. the sound was almost the same as with usual 170 000uf- I cant herd diference.. exept that maybe 800VA trafo get more buzzz and some flatiness and in sound mean..but then I decided to bypass al( maybe silly idea, but I have a bunch audiophilic quality caps for speakers froject ordered group buy to me and few friends from shuro.de) so I bypass every cap with audyn kpsn zinc folie, solen, audyn mkp,- all what I found. the bigest caps I bypased witth 2 film caps. bigger and litler, smal caps bypases with 33uf big(almost biger as a electrolytic 4700uf ) total I get arround 150uf film capasistance.
ALSO i PUT IN PCB 8 pieces ELNA SILMIC ARC II 50V 470UF instead 220uf.

turn on system( proac response 2,5 clone, aleph 5/heavily modified akai cd 69, dual cs745 turnable, kimber pbj, acr-fostex speakers cables)

left for 10-20 minutes, then comeback and try to listen.
I was shocked the sound become ABSOLUTELY DIFERENT.
there no mean terble become ... or bass become.. soundstage become.. everything changed totaly. thae bas was so increribly reoliution I was amazed, midrange become 0% distortion, and the hights become much more sharp and at the same time liquid soft(very hard to describe) and sounstage changed to deep but at such a resoliution that sound so fucus that sometimes looks it cames from one litle point. I was amazed, tie after time changed cd and didnt recognized my cd.. superb resoliution.acoustic fragments sound like in my room.. I hear a lot of expensive combo but his time this sound beats everything I have heard.

at 4 am I go to sleep hoping that there was my ears misunderstanding.. at morning wake up and try again.. the same thing..

I called to friend and he borow this amp to audition.( audionote cd3 cdp, triangle altus 202, audioquest cv6, mit cables,pretty expensive cables, two aleph(made by me) on biamping) afetr 20 minutes he called to me and with strange shaking voice asked what is that???????!!! he never heard anything like this.. he sayid that system so improved that he can not recognize.. after 2 days of listening he again call me and said that amp is superior. Now I have a problem to bring it to me..for listen to it again

Anybody with expierence can say what is that???

P.S. if this tiunig so good I am planning take patient and will start new line of alephwith Mr. Nelson. . I would call this line “RollAudio NelsonA5 version 3.58MK II”

If serious I would like to know what I have done good(wrong).
__________________
natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..
  Reply With Quote
Old 1st March 2005, 03:22 PM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I think that throwing tons of every kind of cap on the
supply is a very valid approach. Congratulations on
your discovery.

  Reply With Quote
Old 1st March 2005, 03:35 PM   #3
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
The differences i noticed with bypassing is that the biggest difference is up to about 30 uF film caps, using different cap types.
The minimum i use for powersupply bypassing are 10 uF film caps, with exception of styroflex caps.

In 2004 shiploads of film caps were dumped on the internet for some reason, i bought 100s of Siemens and Roederstein MKP, MKC, MKT's and styroflex caps.
Just this week i placed a bid on a number of 100 uF Audyn MKP Q5 loudspeaker caps.

Bypassing this heavilly has become standard in the tube section, no doubt any solid state amplifier benefits too, especially the class A models.

Even with class A amplifiers that have large electrolyte cans in the powersupply i like to place a few smaller ones in parallel.
Usually a 4700uF and a 1000 uF, after that at least 10 uF MKT, 10 uF MKC, 10 uF MKP.
Since the Styroflex caps have become so cheap i add a few styroflex caps.
( i remember paying big money for the Orange square Siemens styroflex caps i used for preamp circuitry)

J
__________________
The buck stops Here
  Reply With Quote
Old 1st March 2005, 03:45 PM   #4
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
The real question is how much drugs/alcohol could you ingest in those 10-20 min?
  Reply With Quote
Old 1st March 2005, 06:09 PM   #5
acaudio is offline acaudio  Germany
diyAudio Member
 
Join Date: Sep 2004
Location: Germany
you are very directly
  Reply With Quote
Old 1st March 2005, 06:13 PM   #6
diyAudio Member
 
elviukai's Avatar
 
Join Date: Apr 2003
Location: EU- Electronic Union country
Quote:
Originally posted by grataku
The real question is how much drugs/alcohol could you ingest in those 10-20 min?

yeap I am medicine doctor not a electronical genius or alkoholic . but I sang in chorus, have lot of friends in live music . my girlfriend playing in orhectra with walthorn and I hear live music a lot,so my ears not totaly dead. smash: the diference was. and was huge. I tryed disconect and hook up another aleph 5 in that evening( I hope Mr. Nelson do not against buch of a5 build for personal use ) and sound become less focused,liquid treble disapeared imedietly. and thees changes are not audiophilic bla bla bla "this kimber cable ir more.... but this van den hul has less wides soundstage.. etc etc" diference was obvious and huge. I tryed the same tiuning with 250v 3.3uf philips caps but the diference is not so obvious-something changed,but dont know what. I dont compare to that first one but when I will try I let you know.in physical laws low capasity polypropylen caps should improove only high frewuency area at least. very intereting I think I will try to spent exra bucks for this tiuning. anyone who goies sceptical to this I would recomend to do this mods on this amp with exactlky the same caps and then reply
:
__________________
natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..
  Reply With Quote
Old 1st March 2005, 06:20 PM   #7
diyAudio Member
 
elviukai's Avatar
 
Join Date: Apr 2003
Location: EU- Electronic Union country
Quote:
Originally posted by Nelson Pass
I think that throwing tons of every kind of cap on the
supply is a very valid approach. Congratulations on
your discovery.

didnt more capasitoirs in paralel make more capasistance but also make more resistance which is not good? I tryed to hold law to put in suply only similar 15 000- 22 000 caps but sometimes tyed to mix diferent caps and are very pleasant with results..
__________________
natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..
  Reply With Quote
Old 1st March 2005, 07:33 PM   #8
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
No, the resistances would be in parallel, which reduces the
resistance seen by the circuit.
  Reply With Quote
Old 2nd March 2005, 01:43 AM   #9
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
Your arrangement of the power supply filter capacitors gives me impression.

These days, I try to find an optimum size of power supply filter capacitors. I have followed saying: the bigger, the better. But, when I shift up the size, I see that there is a point from which I start to realize no more distinctive change in result.

I still doubt myself whether the by-pass film capacitors actually helps or not. These days, I tried it again, listening to Odetta: You Got No How. Her voice sounds like a man upon very clear rhythm and pitch of energetic low bass sound. With or without the by-pass caps, I get no distinctive difference in high frequency notes. They keep her voice the same. One thing I could know is that the by-pass caps hardly work negative way. Depending on the amps, it might work positive way, IMHO.
  Reply With Quote
Old 2nd March 2005, 03:09 AM   #10
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Elviukai,
kidding aside, it would be nice to find the most beneficial minimal combination of capacitors that would do the trick.
I bet most other pass amps would benefit as well. The power supply requirements here are a little different that for most other amps.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pot for my Aleph5 Llafriel Pass Labs 2 29th August 2005 10:15 PM
Another Aleph5 mefinnis Pass Labs 57 2nd June 2005 01:10 PM
C7 cap on Aleph5 Duck-Twacy Pass Labs 9 14th September 2004 03:11 PM
Yep, another Aleph5 rwagter Pass Labs 19 31st May 2003 08:06 PM
HELP .... Aleph5 mefinnis Pass Labs 17 10th March 2003 05:32 AM


New To Site? Need Help?

All times are GMT. The time now is 11:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2