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Modulus-86  build thread
Modulus-86  build thread
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Old 21st January 2021, 09:43 AM   #5341
Thepinguin is offline Thepinguin
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[IMG]Click the image to open in full size.[/IMG]


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Old 21st January 2021, 09:45 AM   #5342
calmant is offline calmant  Belgium
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Very nice! And this kind of design does not yield any kind of heat problems?
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Old 21st January 2021, 09:45 AM   #5343
Thepinguin is offline Thepinguin
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images are huge .. sorry

Build is not 100% finish ..
I encountered some **** up on a modulus build, my fault

Enclosure still need little tailoring
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Old 21st January 2021, 09:46 AM   #5344
Thepinguin is offline Thepinguin
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Quote:
Originally Posted by calmant View Post
Very nice! And this kind of design does not yield any kind of heat problems?

Dunno yet

I have option to drill more hole on top plate
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Old 21st January 2021, 12:51 PM   #5345
kevinahcc20 is offline kevinahcc20  United States
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To get effective cooling from those heatsinks you will need open area for airflow below them as well as above them.
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Old 22nd January 2021, 04:16 AM   #5346
Thepinguin is offline Thepinguin
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Yep, there are few holes under the heatsink
Heat sink is 14cm by 6cm height. 1 cm thick. Quite heavy.

This was my 1st ever build. Had some wood on hand precut aluminium plates .. was preferable than an expensive premade case though ..
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Old 22nd January 2021, 11:19 AM   #5347
Joseph K is offline Joseph K  Hungary
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Hi all,

I would like to 'deposit' some public note about a measurement Tom made.
Review: MyRef Fremen Edition / MyRef FE – Neurochrome

I have come here, because I don't know where it is possible to discuss publicly about it. On the original site I did not find access.

First of all, would like to thank Tom for his work. I think he made a very nice and correct assesment, as usual of him.
I do agree with most of the results - and ask to differ with many of the conclusions, but I hope that is permitted democratically..

There is only one thing which bugs me a bit, I would be happy if it could be discussed here, or somewhere else, doesn't matter.

Tom reaches to a conclusion that the Myref amp is having a relatively high noise contribution, with respect to the Mod86.

My problem is, that I see it properly on the contrary, and would like to clarify it, if possible.

From Tom's measurements it results that the Myref produces at 20Hz - 20KHz range, unweighted: 69uV RMS noise on the output;

From his spec's for the mod86, it results that the mod86 produces at 20Hz-20kHz range, unweighted: 40uV RMS noise on the output.

Now Tom' s conclusion is that the Myref is noisy, and one should explore the reasons..

Let me put it differently: the total gain of the Myref is 31,6.
The input referred noise in 20Hz-20kHz, unweighted, RMS is 69uV/31,7 = 2,17uV

The total gain of mod86 is : 10.
The input referred noise in 20Hz-20kHz, unweighted, RMS is 40uV /10 = 4uV

That is ~double of the Myref's input stage contribution, and so the proper question here is: what is causing this in the Mod86?

Apart from this, I really would like to thank again for this effort of Tom.

All the best, George

Last edited by Joseph K; 22nd January 2021 at 11:44 AM.
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Old 22nd January 2021, 11:41 AM   #5348
Vivant is offline Vivant
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Quote:
Originally Posted by calmant View Post
Hey everyone, I've been eyeing this thread and other Neurochrome-related threads for a while now and I'm now planning for a build of my own. I have a few questions though, which I couldn't find an answer to. Sorry if this been asked before, the search function is a little finicky.

I'm slowly building a pair of Troels Gravesen's The-Loudspeaker-III. These monsters only require 15W per channel since the subwoofer is powered by a Hypex plate-amp. Naturally, I laid my eyes on the Modulus-86. My questions are the following:

* Are there any advantage of going dual mono instead of stereo? I figured I might as well spend a little more if it brings about any worthwhile improvements.

* If there are any advantages to dual mono, does it make a difference to house it in a single enclosure as opposed to two smaller enclosures?
In my experience dual mono is the only way to go.
Although with the PSRR of the modules you would expect it to make no difference to share a power supply, that is not the case.
I have built an 86 amplifier and achieved much better channel separation by converting to dual mono. This led to me converting my 286 to dual mono by shoehorning another psu into the (extended) case with the same result.

You can use a single case or separate, it doesn't matter.
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Old 22nd January 2021, 12:08 PM   #5349
calmant is offline calmant  Belgium
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Quote:
Originally Posted by Vivant View Post
In my experience dual mono is the only way to go.
Although with the PSRR of the modules you would expect it to make no difference to share a power supply, that is not the case.
I have built an 86 amplifier and achieved much better channel separation by converting to dual mono. This led to me converting my 286 to dual mono by shoehorning another psu into the (extended) case with the same result.

You can use a single case or separate, it doesn't matter.
Thanks! I'll go for a dual mono in a single enclosure then. That should give me an endgame amp alright for my efficient speakers.

Now I just have to figure out how to design a case with internal heatsinks to keep it nice looking. I'd like it to compliment my other gear, that is a nice SET tube amp.
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Old 22nd January 2021, 02:25 PM   #5350
asuslover is offline asuslover  Romania
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Joseph K , thank you for letting us know about Tom’s review .
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