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  1. #1

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    Default Burson Audio op-amp mod.

    After I bought my Music Hall dac25.2 I knew I was going to have some fun with a few DIY projects with it. But first I must comment that the MH dac sounded fantastic right out of the box. No complaints here on that note.

    My first fun swap was to replace the stock EH Russian 6922 tube with a NOS Amperex Bugle Boy tube. After a good 125hr burn in the difference the Bugle Boy added was not at all subtle. Everything just sounded more "alive" & more involving. Soundstage, imaging, & vocals just took on another life of their own. Things were really heating up around here with my eagerness to give my next project a go.

    In steps the Burson Audio dual HD op-amp upgrade. I ordered direct from Burson & received them in 8 days. The install took all but 10 minutes. The stock op-amps simply popped right out & these guys went right in. After a good 100hr of burn in the results were simply amazing!! I couldn't believe what I was hearing. Kudo's to Burson for such a fine product.

    So now between the new tube & op-amps I'm really, really satisfied with this dac's incredible sound. But as tweakers go I'm still on the fence about replacing the stock caps with some nice Auri caps. I just don't know if they would take things to even a higher level. If I do proceed with the Auri caps I can assure you that my DIY fun with this dac will be complete. Nothing like having a little fun with the gear.

    What do you think...do the caps or what????
    "2 Channel & 11.2 HT "
    Panny 65" 3D Plasma
    Yamaha AVENTAGE RX-A3010 AVR
    D>SONIC M2-600M mono's / mains
    Rotel RMB-1095 / 5 channel amp
    Rotel RMB-1075 / 5 channel amp
    TEAC UD - 501 DAC
    Oppo BDP-93
    SONOS System
    KEF Q900 / mains
    KEF Q600 / center
    KEF Q800 / surrounds
    KEF Q100 / rear surr.
    Def Tech ProMonitor 1000 / front & rear presence
    Velodyne SPL-1200R subs / dual pair
    DSPeaker Anti-Mode 8033 sub EQ
    Equitech Balanced Power Son of Q 1.5R
    Extensive room treatments

  2. #2

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    Default

    I bought the Burson op-amp regulators for my Adcom dac. Also upgraded the ancient stock op-amps with new OPA627's at a cost of $100. Upgraded the power supply caps with Panasonic FC's and Nichicon and also upgraded the Op-amp coupling caps with Multi-caps and REL caps.

    Not even the same dac!!! I would have used Auricaps in the coupling position but they didn't have anything close to the ratings I needed. I have a couple Dared tubed pieces that use Auricaps standard and they sound wonderful. I am getting ready to upgrade my Norh tube integrated with Auricaps. A very worthwhile upgrade IMO.

    FYI

    http://www.polkaudio.com/forums/show...9&postcount=74

    http://www.polkaudio.com/forums/show...&postcount=108

    http://www.polkaudio.com/forums/show...&postcount=115

    Auricaps will take things to the next level, no doubt. My favorite medium cost signal path capacitor.

    H9
    Last edited by heiney9; 08-28-2010 at 10:56 AM.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  3. #3

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    Great info Brock! I see you mentioned that the Auri caps are your favorite medium priced cap. What other one's should I also look at as an upgrade over the stock caps if price isn't an issue? I know that one can get carried away with mods but if I make this my last mod to the unit I want it to sing.
    "2 Channel & 11.2 HT "
    Panny 65" 3D Plasma
    Yamaha AVENTAGE RX-A3010 AVR
    D>SONIC M2-600M mono's / mains
    Rotel RMB-1095 / 5 channel amp
    Rotel RMB-1075 / 5 channel amp
    TEAC UD - 501 DAC
    Oppo BDP-93
    SONOS System
    KEF Q900 / mains
    KEF Q600 / center
    KEF Q800 / surrounds
    KEF Q100 / rear surr.
    Def Tech ProMonitor 1000 / front & rear presence
    Velodyne SPL-1200R subs / dual pair
    DSPeaker Anti-Mode 8033 sub EQ
    Equitech Balanced Power Son of Q 1.5R
    Extensive room treatments

  4. #4

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    What values are in the signal path?
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  5. #5

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    If my memory serves me well...they are 1.3 uF. I'll have to pop the hood & take another look but I'm almost positive that this is correct. Any suggestions for the upgrade.
    "2 Channel & 11.2 HT "
    Panny 65" 3D Plasma
    Yamaha AVENTAGE RX-A3010 AVR
    D>SONIC M2-600M mono's / mains
    Rotel RMB-1095 / 5 channel amp
    Rotel RMB-1075 / 5 channel amp
    TEAC UD - 501 DAC
    Oppo BDP-93
    SONOS System
    KEF Q900 / mains
    KEF Q600 / center
    KEF Q800 / surrounds
    KEF Q100 / rear surr.
    Def Tech ProMonitor 1000 / front & rear presence
    Velodyne SPL-1200R subs / dual pair
    DSPeaker Anti-Mode 8033 sub EQ
    Equitech Balanced Power Son of Q 1.5R
    Extensive room treatments

  6. #6

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    Quote Originally Posted by pearsall001 View Post
    Great info Brock! I see you mentioned that the Auri caps are your favorite medium priced cap. What other one's should I also look at as an upgrade over the stock caps if price isn't an issue? I know that one can get carried away with mods but if I make this my last mod to the unit I want it to sing.

    Other choices could be

    V-cap Teflon (very expensive)
    Vishay-Roderstein
    Mundorf paper in oil
    Sonicaps
    REL caps
    Multi caps.

    Here's a link to Part Connexion; click on the film capacitors section

    http://www.partsconnexion.com/

    Many times it's about what values they come in and the big one is; will they physically fit in the space provided?

    Have fun the results speak for themselves.

    H9
    Last edited by heiney9; 08-28-2010 at 02:27 PM.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  7. #7

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    Quote Originally Posted by pearsall001 View Post

    In steps the Burson Audio dual HD op-amp upgrade.
    Interesting, are the opamps in the low pass filter/output section or the current to voltage conversion?If the former is the tube used just as a follower(buffer) after the opamps? does this DAC give the option of using either the direct output from the opamps or the tube?
    ...I'm still on the fence about replacing the stock caps ...
    Are the stock caps film's or electrolytics?
    Quote Originally Posted by heiney9 View Post
    I bought the Burson op-amp regulators for my Adcom dac.
    Cool,are they installed?
    I would have used Auricaps in the coupling position ...
    The 600 is directly coupled.
    Last edited by FTGV; 08-28-2010 at 06:17 PM.

  8. #8

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    Not being familiar with the product for ****s and giggles I googled it and found a review with pics.I see it's a nah on the option of tube or SS output,it's tube only.Too bad because with a discrete opamp of the quality of the Burson's I would wan't the option of bypassing the tube to hear Burson's directly.
    As for output coupling caps it appears there are a pair generic looking axial leaded films.

  9. #9

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    Fred, I haven't gotten around to putting the Burson regulators in yet. In the Fall when things slow down I'll jump into that project and a few others. :)

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  10. #10

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    Phil, what kind of sound are you looking for?
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  11. #11

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    Quote Originally Posted by Face View Post
    Phil, what kind of sound are you looking for?
    I was always partial to a warm, laid back sound. But not at the expense of giving up tonal accuracy & tight accurate bass. I take it that your cap suggestion will be based on my listening preference.
    "2 Channel & 11.2 HT "
    Panny 65" 3D Plasma
    Yamaha AVENTAGE RX-A3010 AVR
    D>SONIC M2-600M mono's / mains
    Rotel RMB-1095 / 5 channel amp
    Rotel RMB-1075 / 5 channel amp
    TEAC UD - 501 DAC
    Oppo BDP-93
    SONOS System
    KEF Q900 / mains
    KEF Q600 / center
    KEF Q800 / surrounds
    KEF Q100 / rear surr.
    Def Tech ProMonitor 1000 / front & rear presence
    Velodyne SPL-1200R subs / dual pair
    DSPeaker Anti-Mode 8033 sub EQ
    Equitech Balanced Power Son of Q 1.5R
    Extensive room treatments

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