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The Opamp thread
Jul 19, 2017 at 9:40 PM Post #5,656 of 7,383
rikk009 said:
Just received LME49990 and maybe it's my head playing with me but highs might be just a little bit more clear, just listened to a few songs only. Just...
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The 49990 is more detailed and also has better bass. There is a mod that you need to try with it. You need to put a Silmic 10uf capacitor onto its power pins. The easiest way is to use another socket. The Silmic must have 100 hours burn in. It sounds fantastic for the first 2 hours, then sounds kinda terrible for 20 - 60 and finally is settled at 100 hours. This mod is worth it with the 49990.
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Jul 19, 2017 at 10:11 PM Post #5,657 of 7,383
endia said:
does anybody have any info about these opamps?

https://goo.gl/CA4mDP
https://goo.gl/GX5eNB
https://goo.gl/ZDfEQW

did a google search but no english result but chinese.. they seem quiet popular and have well reputation altough some of them pretty expensive..
thanks in advance..
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My guess is they are fakes. HDAM is an acronym for - hyper dynamic amplifier module - a term used by Marantz to describe their pre opamp circuits. SS3601/2 is a Sparkos designation for their opamps. And the PHILPS at the bottom does not inspire any more confidence. Most likely rebranded 49720/49710HA if you are lucky. Maybe something crappier. If they were legit and good there would be more info out there.
 
Jul 20, 2017 at 4:34 AM Post #5,658 of 7,383
pelopidas said:
My guess is they are fakes. HDAM is an acronym for - hyper dynamic amplifier module - a term used by Marantz to describe their pre opamp circuits. SS3601/2 is a Sparkos designation for their opamps. And the PHILPS at the bottom does not inspire any more confidence. Most likely rebranded 49720/49710HA if you are lucky. Maybe something crappier. If they were legit and good there would be more info out there.
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pelopidas, thank you.
lol, didn't notice product's name containing another brands'..
 
Jul 20, 2017 at 10:19 AM Post #5,659 of 7,383
pelopidas said:
The 49990 is more detailed and also has better bass. There is a mod that you need to try with it. You need to put a Silmic 10uf capacitor onto its power pins. The easiest way is to use another socket. The Silmic must have 100 hours burn in. It sounds fantastic for the first 2 hours, then sounds kinda terrible for 20 - 60 and finally is settled at 100 hours. This mod is worth it with the 49990.
Click to expand...

Seems to be the case with all those LME and the LM4562 - 10uf rail to rail definitely has some impact on the audio reproduction - when I used a silmic ii though it seemed a bit "DSP" like to me (not necessarily a bad thing depending on what you want) while a Nichicon KZ seemed to help with more transparency. Those opamps while generally high performance seem a touch susceptible to acting a bit oddly from power supply noise which I think is what this cap helps to offset.
 
Jul 23, 2017 at 11:38 PM Post #5,663 of 7,383
pelopidas said:
The 49990 is more detailed and also has better bass. There is a mod that you need to try with it. You need to put a Silmic 10uf capacitor onto its power pins. The easiest way is to use another socket. The Silmic must have 100 hours burn in. It sounds fantastic for the first 2 hours, then sounds kinda terrible for 20 - 60 and finally is settled at 100 hours. This mod is worth it with the 49990.
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Hmmm...thanks. After AB comparing both 49990 and 4562 I can hear 49990 has more clarity and better control on bass, highs extended further and more dynamic, worth the upgrade. Also it came to me with broken DIP socket so will give the cap mod a try when I get a new DIP.

Btw, I noticed a LME49850 being used in my DAC which yield nothing when googled. Any idea? I have heard about 49860 but this says 49850.
 
Jul 24, 2017 at 5:27 AM Post #5,664 of 7,383
After I surf internet to find information about MUSES03. It seems the cheapest price (2500 Yen or 23$USD) is at only Japan. MUSE03 is really hit in Japan. MUSES03 has run out of stock 3 times, and everytime they do re-stock. It takes approximately 1 month.
Info Link : Here (You can use google translate for reading)
MUSES03 Review Link : Here (You can use google translate for reading)
OPA627AP vs MUSES03 review Link : Here (You can use google translate for reading)

Hope you enjoy these articles I found. hehe

One question : Do you guys have any recommendation of DAC/AMP or AMP that can use 2 x single op-amp MUSE03 {and have 2.5mm BL output and BL input (preferred if possible)}?
 
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Jul 25, 2017 at 1:50 PM Post #5,666 of 7,383
@golov17 : Yes, 2 days ago. Its stock has 45 pcs. left. and now (at the time I posted) Its stock becomes 35 pcs. left. For those who are login (and register as member) can see. I guess at the end of this month. MUSE03 would be out of stock again.

MUSES03 Stock.JPG
 
Jul 27, 2017 at 10:37 AM Post #5,667 of 7,383
chaiyuta said:
After I surf internet to find information about MUSES03. It seems the cheapest price (2500 Yen or 23$USD) is at only Japan. MUSE03 is really hit in Japan. MUSES03 has run out of stock 3 times, and everytime they do re-stock. It takes approximately 1 month.
Info Link : Here (You can use google translate for reading)
MUSES03 Review Link : Here (You can use google translate for reading)
OPA627AP vs MUSES03 review Link : Here (You can use google translate for reading)

Hope you enjoy these articles I found. hehe

One question : Do you guys have any recommendation of DAC/AMP or AMP that can use 2 x single op-amp MUSE03 {and have 2.5mm BL output and BL input (preferred if possible)}?
Click to expand...

golov17 said:
http://akizukidenshi.com/catalog/g/gI-11843/
Click to expand...

Thanks for the links! I didn't know Muses already launched Muses03. Curious to try.

Btw, I recently reviewed the Burson V5i here:
https://www.head-fi.org/f/showcase/burson-audio-supreme-sound-opamp-v5i.21562/reviews#review-18921

Curious to compare it with the Sparkos and Muses03.
 
Aug 19, 2017 at 4:54 AM Post #5,669 of 7,383
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