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| WNA MKII Headphone Amp | ||||||||
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White Noise (WNA) had closing its doors to business effective from 30th April 2006! Some links are dead! View topic - White Noise Closing Down |
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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 ...... Some links are dead! 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.... Rock Grotto White Noise Audio Rock Grotto - Forum View Circle - White Noise Audio Forum |
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| My Current WNA MKII | ||||||||
| WNA MKII - schema without any modifications: | ||||||||
 This parts I use: Currently there is no ZOBEL network, no additional 330 kOHM feedback. Additional modification: Bypass the Evox Rifa PHE 450 100nF (C2, C3) with WIMA FKP2 10nF/63V This caps are mouted on rear side:
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WNA MKII Railsplitter |
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(1) 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. |
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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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| (2) 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 : LM6171, AD843, OPA602, AD847, LT1056, LT1022,TLE2071, OPA134, OPA604, LME49710, OPA627, Supreme Sound Opamp V5S, AD797, OPA134 New! WNA MKll Head-amp kit. - Page 51 New! WNA MKll Head-amp kit. - Page 76 - Head-Fi Covering Headphones, Earphones and Portable Audio Gain Bandwidth / Slew Rate / Input Stage LT1056 5.5MHz 14V/µs (JFET input) LT1022 8.5MHz 23V/µs (JFET input) TLE2071 10MHz 24V/µs (JFET input) OPA134 8MHz 20V/µs (JFET input) OPA602 6.5MHz 35V/µs (DiFET input) OPA604 20MHz 25V/µs (JFET input) OPA627 16MHz 55V/µs (DiFET input) AD797 8MHz 20V/µs (BJT input) AD847 50 MHz 300V/µs (BJT input) AD845 16 MHz 100V/µs (BiFET input) AD843 34 MHz 250V/µs (CBFET input) LM6171 100MHz 3600V/us (BJT input) LM6181 100MHz 2000V/µs (BJT input) LME49710 55MHz 20V/µs (BJT input) Supreme Sound Opamp V5S 50MHz 36V/µs ... 49V/µs (FET input) |
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(3) Next step 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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| (4) Next step 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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(5) Next step 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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(6) We had ignored Linear Technology
http://www.linear.com/
Next step 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 don't 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 
Speed are not essential |
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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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(7) 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  |
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(8) 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
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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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(9) 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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| (10) 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) |
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| (11) 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. |
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| (12) Now I test OPA134 opamps (biased into class-A as all others in this place). At first listening I don't hear noticeable differences to AD797. For
the subtleties, you would need two completely identical amplifiers,
differing only in the operational amplifiers used, and do an ABX
comparison. This actually applies to all OPAs. The comparisons
that have already been made only represent the subjective feeling.
However, differences may still exist. In general, there is a noticeable
difference to the headphone amplifier built into the Marantz SACD
player SA 7001 KI. |
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| (13)
Two Supreme Sound Opamp V5 I used too Supreme Sound Opamp V5 (Supreme Sound Audio) Supreme Sound Opamp V (Burson Audio) |
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More about coming soon! Is now in the house!
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| Now my WNA MKII works with Two Supreme Sound Opamp V5 S First pictures and informations from |
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| (14)
Two Burson V6 Vivid I use now Burson V6 Vivid and V6 Classic |
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I listen to these with enthusiasm! More about coming soon! Burson Audio V6 Vivid and V6 Classic fully discrete audio opamp |
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| To WNA MKII schema |
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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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Suggested modification hints looks like WNA MKIII (but currently on hold)
If I have this done I will publish some photos here. |
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Suggested modification schema looks like WNA MKIII: |
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WNA MKIII - schema without any modifications: |
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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
Head-Fi
(Headphone Hi-Fi and Portable Audio) - New! WNA MKll Head-amp kit. |
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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 | ||||||||
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Black Gate as a super-E-Caps capacitor Jelmax Co., Ltd closed its doors in August 2007, Black Gate production has stopped in 2006 |
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| Black Gate TOP Page english (from web.archive.org) Some Links are to web.arcive.org Jelmax H.P.
BlacK Gate - The champion of the circuit cleaning; Black Gate as a
super-E-Caps capacitor Inside Black Gates - Structure More about Jelmax H.P. and Black Gate! Inside Black Gates - Model inside Pictures from Jelmax Co., Ltd, BlackGate.jp archived in web.arcive.org
The champion of the circuit cleaning; Black Gate as a super-E-Caps capacitor.
Some Links are to web.arcive.org Jelmax Co., Ltd closed its doors in August 2007, Black Gate production has stopped in 2006 Black Gate capacitor (wikipedia)
〈Performance〉 〈Capacitor〉
What is the "Super-E-Caps"? Source (C) - Jelmax H.P. TOP page |
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| Black Gate alternative Nichicon UES Bi-Polarized, For Audio Equipment For the 1000µF - Nichicon 1000µF 25V UES1E102MHM |
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Farbcode für Widerstände 4 - Berechnung Farbcode Widerstand
Widerstandstabelle Farb Code Ringe - sengpielaudio |
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| Widerstand-Farbcode-Konverter für 5 Ringe und Diagramm | DigiKey Electronics | ||||||||
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In this case it is worth to copy the link and enter it in the WayBackMachine archive.org page. Most of the time you can still find the content, but you may have to search for it in the timeline.
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No guarantee for who is behind the linked pages today! If you find dubious content, please report it!
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Keine Garantie dafür wer heute hinter den Verlinkten Seiten steckt! Wer bedenklichen Inhalt findet, bitte melden!
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Last modified: 24. September 2022 12:50:32.
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