You can use the OPA627 in SMD on an adapter with the 10th Anniversary Edition of the Modulus-86. Not sure why you would as that edition comes as a kit that includes the dip version.
The OPA627 is a single opamp and the LM4562 used in Rev. 3.0 of the Modulus-86 is a dual opamp. So it's not a direct replacement and you'd need a single-to-dual adapter. I'm not sure if those exist, but you could certainly make one. You'd have to re-tweak the compensation to make sure that the amp doesn't oscillate with the OPA627.
Tom
The OPA627 is a single opamp and the LM4562 used in Rev. 3.0 of the Modulus-86 is a dual opamp. So it's not a direct replacement and you'd need a single-to-dual adapter. I'm not sure if those exist, but you could certainly make one. You'd have to re-tweak the compensation to make sure that the amp doesn't oscillate with the OPA627.
Tom
I was thinking I might splurge on Anniversary Edition and I could use surface mount in case esd or something else killed an PPA627. As can see I opted for the regular 86.
I have a pair of Linkwitz Orions that need 8 channels. I’ll use the Modulus 86’s for mod’s /tweets and Class d for the bass bins.
I have a pair of Linkwitz Orions that need 8 channels. I’ll use the Modulus 86’s for mod’s /tweets and Class d for the bass bins.
60 db average playing records simply sublime with piano. No need to turn it up. Detail retrieval is phenomenal.
Finally have 4 channels powered up running mids & tweets. Class d monoblocks on the bass bins.
Simply sublime. The Modulus 86’s driving the tweets was icing on the cake. Jim Morrisons voice is now sweet and smooth just as Jethro Tulls. I’m tongue tied. I’ve had a lot of amps over the years.
Up until yesterday I was just using 2 channels driving mids.
Breadboards a mess but it works. Silent as a graveyard when it’s supposed to be.
Thanks Tom
Simply sublime. The Modulus 86’s driving the tweets was icing on the cake. Jim Morrisons voice is now sweet and smooth just as Jethro Tulls. I’m tongue tied. I’ve had a lot of amps over the years.
Up until yesterday I was just using 2 channels driving mids.
Breadboards a mess but it works. Silent as a graveyard when it’s supposed to be.
Thanks Tom
Love the prototype build. Are those SMA connectors with 90º SMA-SMB adapters into the MOD86?
Thanks for sharing your experience. I appreciate it.
Tom
Thanks for sharing your experience. I appreciate it.
Tom
Nothing special about the rca’s I’m using.
The heatsink never gets above 28C. Is that good or bad?
The heatsink never gets above 28C. Is that good or bad?
Once I get a PS figured out that’s small in stature I’ll find an suitable enclosure and put together interconnects that are long enough so right angle rca’s are not needed.
I’m using 2 Meanwell SE 600-36 powersupplys configured for -/+. I can only dial them down to 33.4vdc. I need to get closer to 28vdc. My speakers are 6.40hm.
I also want/need/think I should have speaker protection. I get a pop on power up. Voice coils can be hard to come by.
I’m using 2 Meanwell SE 600-36 powersupplys configured for -/+. I can only dial them down to 33.4vdc. I need to get closer to 28vdc. My speakers are 6.40hm.
I also want/need/think I should have speaker protection. I get a pop on power up. Voice coils can be hard to come by.
I can imagine a bunch of True Audiophiles claiming it makes the system sound too cold and clinical. 🙂
Oh, sure. Just like some have claimed leaded solder sounded dull and heavy whereas lead-free solder sounded lighter and brighter. 🙂
Tom
A pair of Mean Well LOP-300-30 would be pretty awesome.
Tom
@Julf, I am not sure that our brains evolved to save energy. The development of the brain is not well understood; scientists of all kinds including computer scientists still struggle with how the brain works. IMO, which is a pure conjecture of course and you are free to disagree, efficiency cannot be determined unless one knows how the brain functions.
Furthermore, it is also clear that the brain and our sensory inputs have co-evolved to create a perception of reality. For example, I am always amazed that our visual view field is almost completely a perceptual phenomenon, with active data only being updated in that portion of the perceptual image covered by the central portion of the eye (I believe it is called the fovea).
Hearing is also largely a created perception. Now, I cannot really hear any difference between speaker cables so I just go with cables that are well insulated (that is, insulation that does not allow oxygen to pass through and oxidize the copper strands) and of the lowest gauge that is needed given the power of my amplifier, ie 16 GA. Nonetheless, while perceptual trickery of the mind always exists and needs to be mitigated, it also cannot be avoided as it is inherent in the system.
Furthermore, it is also clear that the brain and our sensory inputs have co-evolved to create a perception of reality. For example, I am always amazed that our visual view field is almost completely a perceptual phenomenon, with active data only being updated in that portion of the perceptual image covered by the central portion of the eye (I believe it is called the fovea).
Hearing is also largely a created perception. Now, I cannot really hear any difference between speaker cables so I just go with cables that are well insulated (that is, insulation that does not allow oxygen to pass through and oxidize the copper strands) and of the lowest gauge that is needed given the power of my amplifier, ie 16 GA. Nonetheless, while perceptual trickery of the mind always exists and needs to be mitigated, it also cannot be avoided as it is inherent in the system.
@Halauhula Our brain is one of the major burners of calories in our bodies. A lot of research seems to agree that back when humans were living under much harsher conditions than we are now, feeding the brain was a costly and dangerous thing, so we evolved to avoid unnecessary use of our brain. It is much easier to jump to a "likely" explanation and trust our "gut feeling" rather than carefully and rationally consider all possibilities.
It's pretty well understood that humans are cognitive misers (i.e., we spend as little energy on cognition as we can get away with). That's how schemas are understood as far as I know. It wouldn't surprise me if stereotypes are the result of this energy saving as well. And most of the time this works well for us. Even if you've only been once to McDonalds you know when you enter Burger King that you don't need to wait at the podium to be seated. Whatever schema you have for fast food restaurants has already told you that you walk to the counter to order and get your grease bomb.
Daniel Kahneman, "Thinking Fast and Slow" is a good introduction to the topic. Those looking for a more entertaining – but just as insightful – read, should have a look at Dan Arieli, "Predictably Irrational". Arieli is a behavioural economist (i.e., operates where economics and psychology cross). Predictably Irrational deals with how we make purchasing decisions.
Perception is a completely different ball of wax.
Tom
Daniel Kahneman, "Thinking Fast and Slow" is a good introduction to the topic. Those looking for a more entertaining – but just as insightful – read, should have a look at Dan Arieli, "Predictably Irrational". Arieli is a behavioural economist (i.e., operates where economics and psychology cross). Predictably Irrational deals with how we make purchasing decisions.
Perception is a completely different ball of wax.
Tom