New! WNA MKll Head-amp kit.
Jul 10, 2006 at 6:54 PM Post #751 of 762

PinkFloyd

Headphoneus Supremus
Joined
Jan 13, 2009
Posts
9,511
Likes
22
You'll notice the rapid ones are 0.1% and not 0.5%
wink.gif
 
Jan 28, 2007 at 1:53 PM Post #754 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
Quote:

Originally Posted by biovizier /img/forum/go_quote.gif
I preferred both the ad847 and the ad8065 to the ad843 - though all were better than the lm6171 - in the head amp at least. I only have the WNA headamp left now.


Now I found the LME49710 (single version from LM4562)

http://www.national.com/pf/LM/LME49710.html
http://cache.national.com/ds/LM/LME49710.pdf

and ordered some LME49710 to test them in WNA MKII
600smile.gif


It's a exciting game LME49710 and LM4562 vs. AD843, OP275, AD823, ect
evil_smiley.gif
 
May 8, 2007 at 8:11 AM Post #755 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
Quote:

Originally Posted by FritzS /img/forum/go_quote.gif
Now I found the LME49710 (single version from LM4562)
http://www.national.com/pf/LM/LME49710.html
http://cache.national.com/ds/LM/LME49710.pdf
and ordered some LME49710 to test them in WNA MKII
600smile.gif

It's a exciting game LME49710 and LM4562 vs. AD843, OP275, AD823, ect
evil_smiley.gif



Hi,
now I use three LME49710 in WNA MKII in my modified WNA MKII, instead of AD843 (amp) / LM6171 (railsplitter).
First I cannot hear any difference between. First I heared with senn HD 600.

I think for exact compare I must use two WNA's so I can change very quick between to hear very small differences
redface.gif


Some of CD/SACD's I used:
KODO (Japan SONY), Concord Jazz SACD sampler, PF Final Cut, ....
 
May 15, 2007 at 9:12 AM Post #756 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
Quote:

Originally Posted by FritzS /img/forum/go_quote.gif
Hi,
now I use three LME49710 in WNA MKII in my modified WNA MKII, instead of AD843 (amp) / LM6171 (railsplitter).
First I cannot hear any difference between. First I heared with senn HD 600.

I think for exact compare I must use two WNA's so I can change very quick between to hear very small differences
redface.gif


Some of CD/SACD's I used:
KODO (Japan SONY), Concord Jazz SACD sampler, PF Final Cut, ....



Hi,
now I am going back to AD843 (amp) / LM6171 (railsplitter)

It's imagination from me or not - with LME49710 and K 701 I feel the trap is littleness sharper .........
music SACD Ray Brown - Summer Wind - Live At The Loa
redface.gif


I test the AD843 in railsplitter - it oscillates
very_evil_smiley.gif
 
Jun 25, 2007 at 2:41 PM Post #757 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
Quote:

Originally Posted by FritzS /img/forum/go_quote.gif
Hi,
now I am going back to AD843 (amp) / LM6171 (railsplitter)

It's imagination from me or not - with LME49710 and K 701 I feel the trap is littleness sharper .........
music SACD Ray Brown - Summer Wind - Live At The Loa
redface.gif


I test the AD843 in railsplitter - it oscillates
very_evil_smiley.gif



Hi,,
now I run two AD847 in my modified WNA MKII (with AKG K701 and Marantz SA 7001 KI)

My first experience:
More punch
More "metal" than "soft" in "brass"
Music come to the fore
Not for quiet sound level - here is the AD843 "king"

My opinion - this statements are subjektiv - objective are only ABX tests with two similar amps but different OPA's and a ABX switcher.
But this statement is be true for the most of the DIY test's ..... or?
evil_smiley.gif


Has anyone test the AD847 (singel) or AD827 (dual) too?
 
Jul 9, 2007 at 9:11 AM Post #758 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
We ignore Linear Technology Linear Technology - Linear Home Page

Now I use two LT1056 in place of the both AD847
There are very little differences ....

First test - from the first tick I hear - I am snoopy why after a burning in time
Treble (cymbals) are a little bit softer, silkier, darker, more natural
Micro Dynamics - more than AD847 - more in background too.

2nd & 3rd test - as far as I can see the LT1056 is a "big player" like AD843 too
rolleyes.gif


Natural, detailled sound with good micro dynamics, open wide and deep stage.

I think one must be changed: The WNA design use a ferrite bead between the output of the OPA and the powerstage. This is not calculated for other OPA's. The datasheet suggestions of LT1056 use a little cap 10 ... 33 pF in NFB:

"When the feedback around the op amp is resistive (RF), a
pole will be created with RF, the source resistance and
capacitance (RS, CS), and the amplifier input capacitance
(CIN ≈ 4pF). In low closed-loop gain configurations and
with RS and RF in the kilohm range, this pole can create
excess phase shift and even oscillation. A small capacitor
(CF) in parallel with RF eliminates this problem. With RS
(CS + CIN) = RFCF, the effect of the feedback pole is
completely removed."

But I dont hear oscillation in audible range or distortion. Only very good sound
smily_headphones1.gif
smily_headphones1.gif
smily_headphones1.gif
smily_headphones1.gif
smily_headphones1.gif


And all this with an "old design" 5.5 MHz, 14V/us OP - silmilar to the OPA602
tongue.gif


Next I will test LT1022 if I get some samples
smily_headphones1.gif


Speed are not essential
evil_smiley.gif

Gain Bandwidth / Slew Rate
LT1056 5.5MHz 14V/us
LT1022 8.5MHz 23V/us
OPA602 6.5MHz 35V/us
AD847 50 MHz 300V/us
AD845 16 MHz 100V/us
AD843 34 MHz 250V/us
LM6171 100MHz 3600V/us
AD817AN 50 MHz 350V/us
 
Dec 31, 2009 at 4:02 PM Post #759 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
I want to use my WNA MKII on a second place in my house - with the old Philips CD650 too.
Headphone is the 25 Ohm impedance Denon AH D7000

Last testing OPA was the LME49710NA - it plays very good - but I am not totally happy with it.

So I searched further, after the LME49710NA I put in ...

OPA134 similar, but a bit more musically than the LME49710NA
OPA604 similar to the OPA134, but a bit more muted
LM6171 that's is - very detailed, more punch, the D7000 likes the LM6171 in the WNA MKII

My special mods in the WNA you found here
blue-danube DIY audio - WNA MKII Modifications

I hear music if I write this text - the longer, the better the music are played, the WNA and CD640 burning in - they had a longer time out before

Music:
Audio - Digital Masters I / Sara K. + some Chesky & Telarc (Classic) samplers
Audio, das Magazin für Hifi, High End, Surround und Musik - AUDIO 01/10

The Klezmatics - Live in Berlin
The Klezmatics - Grammy Award Winning Music

Neil Diamond - Jonathan Livingston Seagull
Paul Simon - Graceland

PS: My opinion - this statements are subjektiv - objective are only ABX tests with two similar amps but different OPA's and a ABX switcher.
But this statement is be true for the most of the DIY test's ..... or?
 
May 13, 2012 at 9:43 AM Post #760 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
[size=x-small]Hi,
before I put my WNA MKII into my depot, I changed the OPA's
before AD847, and now OPA134 ..... and wow it tops my "green" Solo with OPA LME49720HA instead of the AD823.

It's only an imagination? [/size]
normal_smile%20.gif


[size=x-small]The WNA MKII sounds a bit more naturally, warmer
Solo inclines sometimes to a little bit sharp tails ...

The WNA MKII source impedance: 15 OHM (series resistor in the output)
Solo use 33 OHM

Tested with my AKG Q701 (I know some prefer 120 OHM as source impedance with this headphone)[/size]
 
[size=x-small]The next step are[/size]
[size=x-small]now with OPA627 .. and the violins shines ....[/size]
[size=x-small]and my Denon AH D 7000 like it too [/size]
o2smile.gif


[size=x-small]Max Bruch, Violinkonzerte Nr. 1 & 2, Salavatore Accardo, Gewandhausorchster Leipzig, Kurt Masur, CD
Max Bruch, Violinkonzerte Nr. 1 & 3, Tortsen Janicke, Gürzenich Orchester, Markus Stenz, SACD

and the both BlackGates NX 1000 uF 25V are re-burned in now (the sigle caps in signal path) [/size]
 
more about
http://rockgrotto.proboards.com/index.cgi?board=m&action=display&thread=8052

[size=x-small]PS: For two month I had an AKG K1000 as guest - now I must then give back - the K1000 is an very gread headphone! [/size]
 
Apr 22, 2016 at 11:01 AM Post #761 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
Now I was snoopy and ordered a pair of the new Burson Supreme Sound Opamp V5 S for my headphone amp WNA MKII.
Before I used OPA627 (after a lot of others) with best performance.
First short hearing test, my feeling the Supreme Sound Opamp V5 S surpassing the OPA627 in details of music. 
In Ray-Brown-Summerwinds - Li'l darling (tr. 3) I hear each hair of the brushes more than with other OPAs.
Its hard to compare them, I don't have two ident WNA MKII, so I need to swap the OPAs for comparing.
The headphone I use for comparing is the AKG K812 Pro.
Next days I will spend more time for comparing.
About Burson Supreme Sound Opamp V5 S
http://www.ssaudio.com.au/products/supreme-sound-opamp-v5/
http://www.bursonaudio.com/products/supreme-sound-opamp-v5/
 
   
 
Nov 5, 2018 at 2:05 AM Post #762 of 762

FritzS

500+ Head-Fier
Joined
Jan 2, 2002
Posts
776
Likes
166
Now I test AD797 opamps (biased into class-A as all others in this place). They are different to OPA627 and offers a bit more fine details and less sharpness with AKG K812 Pro (in some music tracks hearable).
I had thought about oscillation before without compensation of AD797. But it works well without additional caps. AD797 have a bit of a diva.

AD797 now the best OPA in WNA MKII.
 

Users who are viewing this thread

Top