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The Opamp thread

Oct 16, 2013 at 3:47 AM Post #4,472 of 7,456
spudharris said:
Get them from Auditrak
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thats the only option I see. Another one is wholesale.
 
I noticed the price on their ebay store has additional shipping cost of $21 while on their website shipping cost is not mentioned.
 
Will wait for your review before splurging.
 
Which one are you gettin ?
 
Oct 16, 2013 at 8:34 AM Post #4,473 of 7,456
psygeist said:
thats the only option I see. Another one is wholesale.

I noticed the price on their ebay store has additional shipping cost of $21 while on their website shipping cost is not mentioned.

Will wait for your review before splurging.

Which one are you gettin ?
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Price on website includes carriage. I've ordered Muses02 but I'm afraid it is going to work out expensive. Customs have got it so I will have 20% VAT + £13.50 handling fee :mad:

This had better set my ears alight for the price.
 
Oct 16, 2013 at 2:48 PM Post #4,474 of 7,456
Today i tried to swap the stock opamp 2068D of my O2 to the 1641 and the sound changed very slightly: a little darker, smoother sound, everything else is the same, may be bass is a little stronger, what a surprise :))
P/s: I clearly prefer the JRC 2068D to opa1641.
 
Oct 17, 2013 at 4:25 AM Post #4,475 of 7,456
OPA627 swapped with OPA2227 int output stage of the amplifier. Wow ! this sounds pretty good.
 
Oct 19, 2013 at 1:43 AM Post #4,476 of 7,456
I just purchased an HT Omega eClaro and found out that is has swappable op amps and was wondering what op amp is recommend for high current deliver on low ohm headphones. Im using some studio monitor headphones with them and love the sound but wanted alittle tamer highs and a little more of a warmer sound im happy with the bass as is ATM. Using JVC VICTOR MX10-Bs
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and stock JRC4580 DIP op amp. The card is feeding it 12v and i only have one socket it must be stereo and use DIP8 or DIP10 format. Im willing to consider a SOIC to DIP adapter configuration (im alright with a soldering gun)
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Oct 19, 2013 at 4:03 PM Post #4,477 of 7,456
libertad said:
  I just purchased an HT Omega eClaro and found out that is has swappable op amps and was wondering what op amp is recommend for high current deliver on low ohm headphones. Im using some studio monitor headphones with them and love the sound but wanted alittle tamer highs and a little more of a warmer sound im happy with the bass as is ATM. Using JVC VICTOR MX10-Bs
L3000.gif
and stock JRC4580 DIP op amp. The card is feeding it 12v and i only have one socket it must be stereo and use DIP8 or DIP10 format. Im willing to consider a SOIC to DIP adapter configuration (im alright with a soldering gun)
cool.gif
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Appears to be a headphone buffer output changeable socket. So the usual popular dual or adapted-to-dual suspects should work.
 
Usual suspects means, LME varieties,  OPA2132P/OPA627 types, AD797 types and so on. I would just buy LME49990MA or from here on an adapter board from the far east somewhere (about $20us), slightly favors the lows but has good clarity and separation throughout all the ranges.  For a couple of dollars you could try a NE5535N but I don't think that is the sound you are looking for.
 
[Waiting for the report back here on the MUSES02 sound quality. (MUSES01 favors highs MUSES02 favors lows or so they say)]
 
Oct 19, 2013 at 11:14 PM Post #4,480 of 7,456
razzz42 said:
  Appears to be a headphone buffer output changeable socket. So the usual popular dual or adapted-to-dual suspects should work.
 
Usual suspects means, LME varieties,  OPA2132P/OPA627 types, AD797 types and so on. I would just buy LME49990MA or from here on an adapter board from the far east somewhere (about $20us), slightly favors the lows but has good clarity and separation throughout all the ranges.  For a couple of dollars you could try a NE5535N but I don't think that is the sound you are looking for.
 
[Waiting for the report back here on the MUSES02 sound quality. (MUSES01 favors highs MUSES02 favors lows or so they say)]
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Thanks for the prompt reply ill definitely look into those. I am not versed into how they generally affect sound if you don't mind giving a simple break down on the OPA2132/627,AD797 and the NE5535N. It would be greatly appreciated. Im also waiting to see how the MUSE02 sounds and thanks again for your thoughts.
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Oct 20, 2013 at 5:41 AM Post #4,481 of 7,456
libertad said:
  Thanks for the prompt reply ill definitely look into those. I am not versed into how they generally affect sound if you don't mind giving a simple break down on the OPA2132/627,AD797 and the NE5535N. It would be greatly appreciated. Im also waiting to see how the MUSE02 sounds and thanks again for your thoughts.
biggrin.gif
 
 
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It won't work like that. You have a different card than I do with a different chip set (Digital to Analogue Processor) plus I have (2 ) I/V swappable op amp sockets and (1) buffer output swappable. You have a CMI8788 audio processor where the specs look pretty good but I can't say I have heard it before unless it was a lesser model built into a motherboard. Stock buffer op amp for you is the 4580JRC. No idea when changing it out how responsive the results will be but it is cheaper than buying new headphones to get a different sound. Maybe your headphones will react better or worse than other models.
 
Different model op amps can sound different even if the numbers are the same but the model lettering changes or there are sound differences between single and dual channel packages of the same chip scheme. Maybe available the same single channel chips made in a dual channel chip but guys here in the past will usually say there is a difference in sounds between them even though it's the same model type op amp. Note sometimes the sellers are not clear about their items.
 
It's BBOPA627AU (Adds to much of its own coloring for me),  AD797BRZ or maybe the AD797BR (Was my go to chip for a few years but sounds a bit dark now compared to LME49990MA) of course the old NE5535N (which is the clearest, cleanest, most detailed and brings forward the entire sound range but in a cold way). LME49990MA works in the buffer (good clarity, separation and detailed bass). I didn't mention the LT1028CN8 which I am running in the buffer (Adds clarity and details favoring the highs and offsets the lows a bit from the LME49990MA that feed it from the I/V sockets, nice configuration). The LT1028CN8 being a single channel DIP, requires an adapter board with (2) side-by-side DIP sockets on top and DIP pins on the bottom. Make sure to have room to plug it in. It comes in a smaller/dual? package but I won't take the chance on a different sound coming from it.
 
If you don't order the specific op amps called out then you might have a different opinion of what they sound like even if it is one letter or number off beside keeping straight the single and dual op amps with the necessary adapter boards.
 
Me, I like open headphones and favor the highs so when I say dark, an op amp tends to have more bass. Coloring is an overall enhancement you can't remove or adjust away so you'd better like it. Some op amps bring forward the mids, highs or lows but you will discover that on your own terms. Warmth, echo, tinny, harsh, booming, flat, staging, depth, falloff, etc., you tell me.
 
Oct 20, 2013 at 12:52 PM Post #4,483 of 7,456
Where do you come from?
 
In the UK I use Farnell. In the USA you have Mouser, Digikey etc.... Always buy from a trusted source, e-bay does have some genuine sellers but a lot of the expensive boutique opamps are fakes. Some of the manufactures also offer samples.
 
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