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|WNA MKII Headphone Amp|
White Noise (WNA)
will be closing its doors to business effective from 30th April 2006!
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More about WNA MK II please see here:
New - old flaggshiff WNA MKII
New! WNA MKll Head-amp kit. - Page 1
New! WNA MKll Head-amp kit. - Page 51
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WNA MKll Head-amp kit. - Page 76 - Head-Fi Covering Headphones, Earphones and Portable Audio
WNA MKll Head-amp kit. - Head-Fi Covering Headphones, Earphones and Portable Audio
WNA MKlll announced! - Head-Fi Covering Headphones, Earphones and Portable Audio
Rock Grotto Forum - I miss the WNA discussions! Suggestion .....
rock grotto - WNA MKlll minor glitches....
White Noise Audio
Rock Grotto - Forum
View Circle - White Noise Audio Forum
|My Current WNA MKII|
David use a thin twisted 3 pol. wire for power connect between rail splitter and each amp - I use the twisted (red/black) wire for +V -V and the green wire for ground (on bottom side of PCB) - and use the twisted (red/black) wire for output (P2 to Jack) on forefront of PCB.
This parts I use:
My WNA works now - the first burn in test with my Senn HD 600 headphones - "WOW" its much more better than the headphone output of my Philips CD 650 or of the Yamaha CR 2040 receiver - both are "old HiFi classics". A complete test of hearing follows - with Eva Cassidy "Live At Blues Alley" and some other music all my hairs stand up, I have never heared this so before
|Modification: Bypass the Evox Rifa PHE 450 100nF with WIMA FKP2 10nF/63V and the Nichicon FG 100uF with Evox Rifa PFR 220pF|
My experience with some other OPA's ..... from
New! WNA MKll Head-amp kit. - Page 51
New! WNA MKll Head-amp kit. - Page 76 - Head-Fi Covering Headphones, Earphones and Portable Audio
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
Some of CD/SACD's I used: KODO (Japan SONY), Concord Jazz SACD sampler, PF Final Cut, ....
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
I test the AD843 in railsplitter - it oscillates
now I run two AD847 in my modified WNA MKII (with AKG K701 and Marantz SA 7001 KI)
My first experience:
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?
Has anyone test the AD847 (singel) or AD827 (dual) too?
We ignore Linear Technology http://www.linear.com/
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
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
But I dont hear oscillation in audible range or distortion. Only very good sound
And all this with an "old design" 5.5 MHz, 14V/us OP - silmilar to the OPA602
Next I will test LT1022 if I get some samples
Speed are not essential
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
|Rock Grotto Forum - AD847 vs AD843 in WNA MKII|
But - please give the LT1056/LT1022 a chance - free samples
for LT1056/LT1022 are open (2 pcs) - last both days I had some sessions ....
The LT1056 sounds warm and cold, sharp and soft, analytic and natural - so as the sound-engineer has done his work
Roger Waters, Amused To Death
Deeeep natural bass
Pink Floyd, Final Cut
Good micro dynamics, very subtle in background (slapping shoes, playing children, ..)
Pete Townshend "Face the face" (in german we
said "fetzt so richtig") deep bass "grummel
" and brutal drums
Sinéad O'Connor "GOSPEL OAK" had rare heard this so natural and realistic
I think this are twice effects -
one the LT1056
second - my K701 nearly burned in
The K701 is one of the best headphones I ever heared!
Yesterday I got samples of LT1022
My first (subjective) look and feel - the LT1056 sounds better - but I will give the LT1022 a chance to burn in
maybe, yesterday I had a bad day to hear?!
additional listenings ....
sometimes a very little bit muted
leadsinger a bit more in background, quieter - but background sound a bit louder clear sound
emotionally I missing something but I cannot say what
LT1056 sometimes tiny strained in treble at sizzle cymbal, LT1022 does not.
This statements are subjektiv and emotional ......
I rate LT1056 emotionall prior to LT1022, but very close
I found in my treasure chest some ....
OPA 655 http://focus.ti.com/docs/prod/folders/print/opa655.html
400MHz UNITY GAIN BANDWIDTH
LOW INPUT BIAS CURRENT: 5pA
HIGH INPUT IMPEDANCE: 1012(ohm) || 1.0pf
ULTRA-LOW dG/dP: 0.006%/0.009°
LOW DISTORTION: 90dB SFDR at 5MHz
FAST SETTLING: 17ns (0.01%)
HIGH OUTPUT CURRENT: 60mA
FAST OVERDRIVE RECOVERY
have anyone experince about this?
and some too
and ... whats about this?
Thanks - now the OPA602AP is inside
My first short impression without burn in or longer warming up and only one CD "PF FinalCut" ...... nearly perfect - detailled, good micro dynamic .... more later .....
After some sessions I can say (for me) the OPA602AP is one of
the distinguished OPA's for the WNA MKII.
Very balanced, detailed music
Better than LT1056 LT1022 AD847 AD843 LM6171 LME49710?
I cant say this with guarantee but the OPA602AP is a new star
Open to test - but what is your experience about this?
AD8065, OPA604, AD845, OPA627, AD825, AD8610, AD9631
Yesterday evening I heared Roger Waters "Amused to Death" -
this was a extraordinary epiphany
I think its near "the end of the flagpole" with my components - another OPA have a rough ride to overcome the OPA602AP in WNA MKII
To make a great shift in sound I must change others, ... the CD/SACD player, the headphones, .......
Now I use two TLE2071 inside my WNA MK II - but no elementary
difference between OPA602 and TLE2071. I think they come from the same TI
Compare to the Graham Slee "green Solo" the WNA sound a little bit sharpen - PF Final Cut track 1 - rattle the coins.
The "green Solo" rattle the coins more actualise
Excalibur low-noise high-speed TLE207x
BB/TI OPA1632 an interesting Audio OP AMP
|Before I put my WNA MKII into my depot, I changed the OPA's
before AD847, then OPA134 and now OPA627 ..... and wow it tops my "green" Solo with OPA LME49720HA instead of the AD823.
With OPA627 and Denon AH-D7000 or AKG Q701 the violins shines
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 BlackGates NX 1000 uF 25V are re-burned in now (the sigle caps in signal path)
The following modifications I discuss in some DYI
forums ...... as seen
on Walt Jung's Website
WTnT_Op_Amp_Audio_2 - Realizing High Performance: Buffers (Part II)
WTnT_Op_Amp_Audio_1 WTnT_Op_Amp_Audio_3 WTnT_Op_Amp_Audio_4
Replace the two diodes with
transistors - MPSA42 / MPSA92
If I have this done I will publish some photos here.
|Pictures - please klick on pictures to enlarge|
|First building - please klick on pictures to enlarge|
WNA MKII Headphone Amp Parts - please klick on pictures to enlarge
Parts from RS Components
Parts from RS Components
WNA MKII Kit Parts from White Noise Audio
|parts conneXion - The authority on hi-fi DIY parts and components|
Headphone Amp with OP - my
conception with BUF 637T or LM6181 and good OP's
|Viewcom - Holco resistors Viewcom Electronics - Main|
In Forums - about WNA
(Headphone Hi-Fi and Portable Audio) - New! WNA MKll Head-amp kit.
|My current WNA MK II Headphone Amp project|
|My current CD 650 tuning project|
|Graham Slee "green Solo" Headphone Amp|
|Graham Slee "Green" ERA GOLD REFLEX Phono Preamp|
|Tuning Revox Turntable B790|
|My preferred Music|
|Audio Projects - Main|
|Black Gate as a super-E-Caps capacitor|
Step 4 - the final circuit
What is the "Super-E-Caps"?
Source (C) - Jelmax H.P. TOP page
Farbcode für Widerstände 4 - Berechnung Farbcode Widerstand
Widerstandstabelle Farb Code Ringe - sengpielaudio
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