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| WNA MKII Headphone Amp | |||||||||
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White Noise (WNA)
will be closing its doors to business effective from 30th April 2006! View topic - White Noise Closing Down |
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More about WNA MK II please see here: New! WNA MKll Head-amp kit. - Page 76 - Head-Fi Covering Headphones, Earphones and Portable Audio New! WNA MKll Head-amp kit. - Head-Fi Covering Headphones, Earphones and Portable Audio New 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.... Rock Grotto White Noise Audio Rock Grotto - Forum View Circle - White Noise Audio Forum |
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| My Current WNA MKII | |||||||||
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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: |
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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
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| Modification: Bypass the Evox Rifa PHE 450 100nF with WIMA FKP2 10nF/63V and the Nichicon FG 100uF with Evox Rifa PFR 220pF | |||||||||
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My experience with some other OPA's ..... from New! WNA MKll Head-amp kit. - Page 76 - Head-Fi Covering Headphones, Earphones and Portable Audio |
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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  Some of CD/SACD's I used: KODO (Japan SONY), Concord Jazz SACD sampler, PF Final Cut, .... |
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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 I test the AD843 in railsplitter - it oscillates |
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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? Has anyone test the AD847 (singel) or AD827 (dual) too? |
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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 completely removed." 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 |
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| Rock Grotto Forum - AD847 vs AD843 in WNA MKII | |||||||||
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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  Highlights Roger Waters, Amused To Death Deeeep natural bass Pink Floyd, Final Cut Good micro dynamics, very subtle in background (slapping shoes, playing children, ..) |
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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! |
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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?! |
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additional listenings .... LT1022 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 AD845 AD825 (SOIC) OPA627/37 OPA227/28 OPA604 LT1360 LT1363 and ... whats about this? |
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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 ..... |
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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 |
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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, ....... |
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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
(BB) familie. 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 http://focus.ti.com/lit/ds/symlink/tle2071a.pdf BB/TI OPA1632 an interesting Audio OP AMP http://rockgrotto.proboards39.com/index.....read=1192675684 |
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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 WTnT_Practical_Circuits_for_Quiet_Audio_Transmission |
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Replace the two diodes with
transistors - MPSA42 / MPSA92 If I have this done I will publish some photos here. |
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| Pictures - please klick on pictures to enlarge | |||||||||
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| First building - please klick on pictures to enlarge | |||||||||
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WNA MKII Headphone Amp Parts - please klick on pictures to enlarge |
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Parts from RS Components |
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Parts from RS Components |
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WNA MKII Kit Parts from White Noise Audio |
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| parts conneXion - The authority on hi-fi DIY parts and components | |||||||||
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Headphone Amp with OP - my
conception with BUF 637T or LM6181 and good OP's |
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| Viewcom - Holco resistors Viewcom Electronics - Main | |||||||||
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In
Forums - about WNA |
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| My current WNA MK II Headphone Amp project | |||||||||
| DIY Cables | |||||||||
| My current CD 650 tuning project | |||||||||
| DIY Tips | |||||||||
| 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 | |||||||||
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Step 4 - the final circuit 〈Performance〉 〈Capacitor〉
What is the "Super-E-Caps"? Source (C) - Jelmax H.P. TOP page |
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Farbcode für Widerstände 4 - Berechnung Farbcode Widerstand
Widerstandstabelle Farb Code Ringe - sengpielaudio |
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| Die schnelle Nachricht an mich / short message to me - bitte Mailform benutzen / please use the mailform! | |
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© Friedrich Stockhammer Last modified: 30. June 2009 17:14:28. |
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