GUSTARD H10 High-current Discrete Class A output Stage Headphone Amplifier

Nov 4, 2015 at 12:15 PM Post #3,451 of 5,561
   
Hi,
 
Do you find that the cleaner low end goes hand in hand with less perceived quantity? Any other impressions?

No, I would say the quantity is about the same, but the quality has more texture and detail, in the low end especially. I feel like soundstage is a bit larger and more detailed, and clarity of the whole sound has improved a bit. I would say my impression of the sound change agree with what our Captain has already noted. To my ears the detail and texture of the bass was immediately noticeable, that I am sure of.
 
Nov 4, 2015 at 1:13 PM Post #3,452 of 5,561
I've just received the h10 courtesy of Peterek . Great seller btw. Now to dig through 230 pages of thread to see what mods I can do to this baby. Unless I find a link first.
For now I'm enjoying it with a pulse as the dac from USB , feeding he560 and zmf vibro. This is destined to have a monarchy nm24 hooked up this week end to get me some tubey goodness in there.
 
Nov 4, 2015 at 3:26 PM Post #3,453 of 5,561
  So just to be sure, if i'm using the unbalanced connections are the rear op amps being utilized? Are they just for balanced? If I were to buy new opamps should I get both 797/823 if i'm using unbalanced or just 797?

Yes, if you are using the unbalanced rca's, you still need to have those input op-amps in place. In the stock version  you are listening to the NE5532. The AD823 is IMO, a definite improvement.
 
Nov 4, 2015 at 3:33 PM Post #3,454 of 5,561
I've just received the h10 courtesy of Peterek . Great seller btw. Now to dig through 230 pages of thread to see what mods I can do to this baby. Unless I find a link first.
For now I'm enjoying it with a pulse as the dac from USB , feeding he560 and zmf vibro. This is destined to have a monarchy nm24 hooked up this week end to get me some tubey goodness in there.

You are going to love that H10 / HE560 combo. I have been using a heavily modded HE560 with mine and I'm seriously impressed with the sound I'm getting.  Browse through the pages and you will see some of the mods that I have done to the H10. They include:
1. Changing the cabinet feet for carbon cones with constrained layer damping.
2. Extensive emi/rfi shielding with 3M AB5100S material (particularly the transformers)
3. "Swabbing" op-amps - such as, changing the two opa134's to AD797's and the two NE5532's to AD823's
 
Have fun and welcome aboard 'matey.
 
Nov 4, 2015 at 6:49 PM Post #3,455 of 5,561
Thanks Mac,
Op amps first I think.. The mids are very forward with my zmfs. Too much, kinda honky. I will def follow your lead. I nearly bought your bel canto a while back. Thanks for response.
 
Nov 5, 2015 at 12:45 AM Post #3,456 of 5,561
  Bosun Swannie!    Let me start right off with a tip of the Captain's hat for the Shelby Lynne reccomendation. I just listened to the whole album of "Just a Little Lovin' " and it's been added to my ever growing songbird list.  Gorgeous voice, gorgeous songs and a superb recording!
 
I'm also very pleased to hear that my First Mate is trimming his jib with some tasty op-amps.  Isn't this fun!  We start off with an amp that is a stupid good performer at a ridiculously low price and then we can have fun personalizing its sound.  I noticed the enhancement of soundstaging the most with the 797/823 combo, followed closely be neutral tonal balance and clarity.   I would agree that the clarity really shows itself with bass tracks - no more amorphous washes of seemingly texture-less low bass, nope, a smorgasbord of  subtle tonalities.  Marcus Miller is definitely a great choice for electric bass listening along with my go to guy, Stanley Clark. For acoustic bass, my favorite  is Glen Moore playing his 1715 era Klotz double bass fiddle.
 
I'm not done with my op-amp swabbing. The 797BRZ/823 combination is a tough act to follow, but I'm keeping my mind and ears open to discovering some more ear-nectar.  Today is a very good swabbing day at Stu's place.  Arriving simultaneously are the dual 797BRZ's pre-mounted on adapters to try in place of the AD823's  and also a complete set of single and dual op-amps from the Burson boys in Oz.  


 
Its pretty cool how they put a 797BRZ on top and solder another one underneath in such a small package. Rather nicely done and very reasonably priced from Analog Metric in Hong Kong.  I got a pair delivered for $40.64.  The Burson Audio Supreme Sound Op-amps are very impressive to look at and even have a Joey logo for that Oz magic.  They run $90 for a shipped pair of the single op-amps and $150 for the duals.  If they can really outperform the 797's, then I will consider it money well spent.  
 

 
I snagged this pic from their website, so all us swabbies can appreciate what is going on inside and why they cost so much more than mass produced IC op-amps. This is going to be VERY interesting. The king of discreet op-amps vs. what I consider to be a top IC op-amp.  Much thanks to Dennis at Burson for hooking the Captain up.  The Bursons need many hours of burn in as compared to an IC op-amp, so an honest comparison will take me at least three or four weeks of near continuous play.  Stay tuned 'Mates, I got this!


I ordered a set of Burson v5 op-amps on account of this post. 
bigsmile_face.gif
I should have them soon.  I'll post my impressions and pics of the swap process once I get them.
 
What does everyone use to pull their op-amps?  I did a number on the stock op-amp when I pulled them to replace with the AD 797 and AD 823.  I need a better hammer for the job.  especially since I keep buying new ones. 
blink.gif
  I was thinking of something like this ic puller http://www.amazon.com/Stainless-Steel-Insulated-Vinyl-Puller/dp/B0002JEZ2I/ref=sr_1_1?ie=UTF8&qid=1446702220&sr=8-1&keywords=ic+puller
 
Nov 5, 2015 at 12:00 PM Post #3,460 of 5,561
Hello everyone.
Yesterday I replaced the standard op-amps of my H10 with a set of Burson Supreme V5 SS-Opamp. Dual + Single, a total of 4 pieces of course.
 
Here are some photos!
 
The boxes:
 

 
 
Setting up....
 
Case opening
 

 
All op-amps set-up. I had a photo taken 'during' the process, but it was horribly out of focus so I had to drop it.
 
 

 

 

 

 

 

 
 
Anyway, one thing worth to mention (even if it has been told already in this thread) is that the dual op-amps are near the back of the H10, while the single are in the right side.
The Burson op-amps have a bezel whose position need to match the position of the notch of the op-amp you are going to replace. It is a very easy and straightforward process.
I am no expert and I did the whole operation in 10 minutes or so.
 
I only had one issue, in fact related to the gustard h10 rather than the op-amps: one of the rear screws was overtightened. Luckily, I managed to pull it out with the help of a philips screwdriver. I obviously had to replace the screw with a similar one. Nothing major.
 
But I simply do not understand the need of overtightening, especially with hexagon socket head screw: sometimes the head of these kind of screws is very fragile and if overtightened, it becomes very hard to extract them because they can easily worn.
Now back to listening!! 
beyersmile.png
 with my Sennheiser HD650 (not shown here)
 

 
The boxes now contain the original op-amps:
 

 
 
First impressions: a very nice improvement! Enhanced detail retrieval and wider soundstage.
These are the impressions after 20-30 minutes of listening; I will report more impressions in a few days.
 
Edit: corrections
 
Nov 5, 2015 at 12:08 PM Post #3,461 of 5,561
  Hello everyone.
Yesterday I replace the standard op-amps of my H10 with a set of Burson Supreme V5 SS-Opamp. Dual + Single, a total of 4 pieces of course.
 
Here are some photos!
 
The boxes:
 

 
 
Setting up....
 
Case opening
 

 
All op-amps set-up. I had a photo taken 'during' the process, but it was horribly out of focus so I had to drop it.
 
 

 

 

 

 

 

 
 
Anyway, one thing worth to mention (even if it has been told already in this thread) is that the dual op-amps are near the back of the H10, while the single are in the right side.
The Burson op-amps have a bezel whose position need to match the position of the notch of the op-amp you are going to replace. It is a very easy and straightforward process.
I am no expert and I did the whole operation in 10 minutes or so.
 
I only had one issue, in fact related to the gustard h10 rather than the op-amps: one of the rear screws was overtightened. Luckily, I managed to pull it out with the help of a philips screwdriver. I obviously had to replace the screw with a similar one. Nothing major.
 
But I simply do not understand the need of overtightening, especially with hexagon socket head screw: sometimes the head of these kind of screws is very fragile and if overtightened, it becomes very hard to extract them because they can easily worn.
Now back to listening!! 
beyersmile.png
 with my Sennheiser HD650 (not shown here)
 

 
The boxes now contain the original op-amps:
 

 
 
First impressions: a very nice improvement! Enhanced detail retrieval and wider soundstage.
These are the impressions after 20-30 minutes of listening; I will report more impressions in a few days.

Nice! Thanks for the pics. Keep in mind Burson recommends at least 100hrs burn in. Are you comparing sound to the stock op-amps or to something else?
 
Nov 5, 2015 at 1:14 PM Post #3,463 of 5,561
  Nice! Thanks for the pics. Keep in mind Burson recommends at least 100hrs burn in. Are you comparing sound to the stock op-amps or to something else?

Nice pics GioF71!  You saved me the trouble of posting mine.  It is indeed a simple process to install the Burson op-amps. I too installed the single and double Bursons. Actually, the height and solid walls of the Bursons makes for very easy placement/alignment before pressing them into place.  I am contemplating using some 3M AB5100s material on the red casing to completely shield the Bursons from emi/rfi. I will experiment with that after they have completely burned in.
 
A quick note on that "burn-in"...  the Bursons definitely need some time to bloom.  They sounded compressed with a very forward midrange when I took a first listen.  I wasn't concerned at all because that is typical for a "fresh" circuit.  24 hours with the Purist Audio Enhancement disc (the Roto Rooter of break- in tracks) and they are sounding incredibly good!  I'm going another 24 hours before I will give any substantive details, but this is VERY promising, to say the least.
 
Nov 5, 2015 at 9:38 PM Post #3,465 of 5,561
Originally Posted by stuartmc /img/forum/go_quote.gif
 
Bosun Swannie!    Let me start right off with a tip of the Captain's hat for the Shelby Lynne reccomendation. I just listened to the whole album of "Just a Little Lovin' " and it's been added to my ever growing songbird list.  Gorgeous voice, gorgeous songs and a superb recording!
 
I'm also very pleased to hear that my First Mate is trimming his jib with some tasty op-amps.  Isn't this fun!  We start off with an amp that is a stupid good performer at a ridiculously low price and then we can have fun personalizing its sound.  I noticed the enhancement of soundstaging the most with the 797/823 combo, followed closely be neutral tonal balance and clarity.   I would agree that the clarity really shows itself with bass tracks - no more amorphous washes of seemingly texture-less low bass, nope, a smorgasbord of  subtle tonalities.  Marcus Miller is definitely a great choice for electric bass listening along with my go to guy, Stanley Clark. For acoustic bass, my favorite  is Glen Moore playing his 1715 era Klotz double bass fiddle.
 
I'm not done with my op-amp swabbing. The 797BRZ/823 combination is a tough act to follow, but I'm keeping my mind and ears open to discovering some more ear-nectar.  Today is a very good swabbing day at Stu's place.  Arriving simultaneously are the dual 797BRZ's pre-mounted on adapters to try in place of the AD823's  and also a complete set of single and dual op-amps from the Burson boys in Oz.  
 
 
Curious Stuart, When did you order your dual 797s? I ordered some back on 10/8 and have not gotten them. Las order for them was here within about 14 days... Getting worried... and they sent them with no tracking.
 
BTW, I got a set of the V5 Bursons a while back... right when they were announced. I have yet to install them. Keep us posted on what you think... both you and GioF71 .. please!
 

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