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Old 9th January 2013, 11:35 PM   #11
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The designer of RelaiXed suggests metal-can LME49720s.
See this post.
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Old 10th January 2013, 10:18 AM   #12
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Quote:
Originally Posted by TheShaman View Post
The designer of RelaiXed suggests metal-can LME49720s.
See this post.
The metal can LME49720s are very nice. I built my Relaixed2 with them and it sounds great. Be aware that the metal can amps run a lot hotter than the plastic case DIP8 op amp. Even with the heat sinks shown in my picture and on Jos' website photos, they run pretty hot. I've been looking for even better heat sink options for the metal can.

I am currently playing with op amp options, just because I am curious how different op amps will sound in this pre. When I finally decide, I will remove the socket and solder directly to board. If it turns out to be the metal can, that should help with heat.
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Old 10th January 2013, 12:32 PM   #13
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Quote:
Originally Posted by lehmanhill View Post

I am currently playing with op amp options, just because I am curious how different op amps will sound in this pre. When I finally decide, I will remove the socket and solder directly to board. If it turns out to be the metal can, that should help with heat.

If you will test LME49990, please report us results.

BTW: Which power amplifier do you use?
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Old 10th January 2013, 10:15 PM   #14
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I'm using Fremen Edition MyRef chipamps for power amp. Not an ExtremA, but surprisingly nice.

I will report if I get to try the LME49990, but don't hold your breath. My project list is too long and it will take me a while to get there.
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Old 11th January 2013, 01:10 PM   #15
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Originally Posted by lehmanhill View Post
I'm using Fremen Edition MyRef chipamps for power amp.

Do you use unbalanced or balanced connection to your amplifier?
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Old 11th January 2013, 03:15 PM   #16
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Do you use unbalanced or balanced connection to your amplifier?
I am in the process of shifting to balanced. Since each monoblock power amp is internally single-ended and is located at the speakers, I have some differential line receivers that I have designed and am in the process of building. So far, I've been playing with them on a breadboard. I'm looking forward to pulling it all together.
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Old 11th January 2013, 03:19 PM   #17
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Can you hear a difference using the R-II balanced or unbalanced?
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Old 12th January 2013, 12:14 PM   #18
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Can you hear a difference using the R-II balanced or unbalanced?
I'm not really in a position to answer that question very well. It wasn't really the point of my breadboard experiments where I was looking for stability of my circuit. Perhaps scanspeakman can comment. How about your own expeirence?
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Old 12th January 2013, 12:16 PM   #19
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I only have balanced equipment so I can't try. :-)

Last edited by ijscobar; 12th January 2013 at 12:28 PM.
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Old 13th January 2013, 12:00 PM   #20
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Originally Posted by lehmanhill View Post
I'm not really in a position to answer that question very well. It wasn't really the point of my breadboard experiments where I was looking for stability of my circuit. Perhaps scanspeakman can comment.
Not able to test that yet; I have not build the pre-amp in a case yet so I only soldered a pair of XLR in- and outputs to the pcb.

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