Mythbusters, let's detonate some foolishes. - diyAudio
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Old 11th February 2007, 09:02 AM   #1
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Default Mythbusters, let's detonate some foolishes.

I am making reserve of the title, as i intend to produce this thread that will use schematics with suggestions with parts replacement, allowing you to observe if really made some audible difference.

Quasi complementary and full complementary
Electrolitic condensers in power supply...size, capacitance
The bypass....the snubbers during audio reproduction
The input capacitor
The input impedance
The Miller capacitor
Stop resistors
The mirrored circuit and the non mirrored
The VAS with mirror or without it
The unballanced and ballanced differential

Also the audio cables sonics (have they?)
Also that one amplifier stand over a sofa will sound different if you place it in the floor (ridiculous?...maybe not)

Well...i would like to explore those things, as i have made many testings about.

I will observe the interest if you enter the thread, the hits, the suggestions, the critics...and so on i will decide to dive deeply in the subject.

Not to believe things because Mr. Belton...Mr Incredible....Mr.Blamefest...Mr.Heaven.....SAID... ..test them with your own ears.....spend some time that will result in knowledge to you...check if those things affect your years...or if those things are only for "scopers"....or things to be repeated by the "pirate's parrots"

There' a lot of full ships....a lot of crazy things that can fill one big ship till the top (hehe)

regards,

Carlos
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Old 11th February 2007, 09:07 AM   #2
Nordic is offline Nordic  South Africa
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I need a cheap and nasty 1mA constant current source, till I can get some fets tommorrow... any plans uncle Charlie?

it is for this
http://www.headphoneamp.co.kr/bbs/zb...sijosae&no=217
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Old 11th February 2007, 09:22 AM   #3
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Carlos

You probably should give some direction to this thread by sharing some of your own (extensive) listening experience. Judging from other similar threads we risk seeing more busters than myths.
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Old 11th February 2007, 10:51 AM   #4
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Default I would like to see people concluding by themselves, making some experiences

Because only doing it that people will believe.

There's a lot of Mythmasters....i am not and do not want to be that one.

One experience is simple....remove you input condenser...the small value, because of input impedance...and now install a 220 uf electrolitic condenser in it's place....listen

What is the conclusion...for sure it will be the same as mine.

the problem is that people go believing and never try to test those things to conclude by themselves....this way, the land is good to rise Myths.

Doing this in a single channel....and ask someone to work the ballance for you (not you...never do that...we love to fool ourselves!)..... install your speakers one over the other...or one aside the other.... one channel with the monster capacitor...other one with the adequated, calculated, reasonable capacitor....hehe...check your audition...and tell me if this image appeared in your mind when the ballance operator inform you the terrible, awfull true!

hehe...life use to be splendid.... and our wife is not the most beautifull woman in this world...we are not so beautifull as we imagine...people do not perceive us so kind as we hope for.

regards,

Carlos
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Old 11th February 2007, 11:01 AM   #5
Igla is offline Igla  Slovenia
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GainClone - input cap removed - much difference in sound - to better.
Regulated GC - mosfet regulated supply replaced with LM338 regulated supply - sounds better
Hope this is what you are looking for.
Regards
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Old 11th February 2007, 12:38 PM   #6
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Default Yeah.....yes and no....but informations are valuable...very good


The capacitor remotion result is something we are waiting for....but the Integrated regulator sounding better is a very interesting Myth you are confirming.

That those LM use to sound better...hummmm...good that.... and confirm what a Croatian friend told me during comparison testings.

regards,

Carlos
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Old 11th February 2007, 12:59 PM   #7
Igla is offline Igla  Slovenia
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The PS was first regulated with LM338 then with mosfets (IRF540 and IRF9540) and then changed back to LM338 regulators.
Low end was better with mosfet regulation, but mids and hights were somehow not clean and shouting.
Regards
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Old 11th February 2007, 01:12 PM   #8
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Default That Croatian friend have used Fets to regulate...he quit when perceive


some heat...them he jumped to LM and turn very happy....maybe the way he did the regulator....i do not know.

regards,

Carlos
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Old 11th February 2007, 01:15 PM   #9
Igla is offline Igla  Slovenia
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Here is another one...my TDA1543 NOS DAC...
This power supply cap (usually 10uF to 100uF) everybody on this forum put ''as close as possible'' to TDA1543 +V (5)leg (how do you call it - decoupling cap?)...
one day I just removed it and there was no loss in low end and mids and hights are now cleaner and more liquid.
Regards
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Old 11th February 2007, 03:49 PM   #10
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Default Great Igla!....i have removed the big electrolitic condenser from my amplifier..it


was near the output colector as people use to say that will be good.

Sound was more opened..more brigth without the electrolitic condenser.

Life is beautifull...booom for those Myths...well...they may work under special conditions..hehe...very special conditions.

regards,

Carlos
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