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AK4490 USB Dac with dsd support.
AK4490 USB Dac with dsd support.
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Old 12th August 2018, 06:17 PM   #1581
Aboe is offline Aboe  Denmark
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Quote:
Originally Posted by sonnya View Post
Attachment 696442

This is How it looks. Only trimming is bias.
And running very stable.

It is set not to break any records. But to be stable. Still it performs very well.
Have just been visiting Sonny, and got a change to hear the new amp - have to order a set after that :-)
It was just a test setup, but it sound really good overall. The most astonishing was the huge picture in the sound - you actually feel the room the musicians play in - very open and detailed. Iím looking forward to receive and build the new amp, and test it with different caps in the psu and internal cables.

Cheers

Anders
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Old 12th August 2018, 07:18 PM   #1582
sonnya is offline sonnya  Denmark
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We have tested and Will ship out 2 sets monday/wednesday.

3 sets more is reserved out of 12 pairs. So there is 7 pairs left.

We only had to change 4 caps that takes care of loop stability. They was set very conservative.

Yes it sounds amazing. I have build a lot of amps but this one is in top 3.
  • Rock stable
  • Easy bias adjustment
  • Pitch black bagground.
  • Goes very deep.
  • No listening fatigue. But still very detailed
  • Speakers are fully protected against DC/mall function of amp
  • Basis idle current is 60mA. Output stage bias is easy to set at as low as 40mA
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Old 12th August 2018, 07:21 PM   #1583
sonnya is offline sonnya  Denmark
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When I say top 3 I mean it.
Tssa V1.8 is pushed out by a good margin. Of course it is more expensive but it has safety build in which is not the case for the tssa V1.8 and if we take this into account, then the difference is not that big any more.
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Old 13th August 2018, 01:14 PM   #1584
sonnya is offline sonnya  Denmark
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People ask for at powersupply for the Amplifier.

The following board in the attached picture gives 110.000uF/50V or 90.000uF/63V for 230Ä.

On the second picture you can see a build up using this powersupply and a 800VA transformer.

Cabling is a bit sluggish.
Attached Images
File Type: jpg Fil 16-06-2017 10.14.20.jpg (528.5 KB, 145 views)
File Type: jpg E40CF15F-0AA0-46FD-9391-E2DD32AADA51.jpg (687.4 KB, 137 views)
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Old 19th August 2018, 09:13 PM   #1585
sonnya is offline sonnya  Denmark
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MIRAND A1 V12 specs. Updated!!!

I did some optimization on resistor and capacitor values. Now this has enhanced the performance.

Test is done on a 800VA transformer with 2x32VAC secondaries.

Previous slew rate was 200V/uSec. It is now 300V/uSec.
Bandwidth was 800KHz. It is now 1.3MHz.

The power rating is:
80Watt @8Ohm.
150Watt @4Ohm.
250Watt @2Ohm.

We have optimized on all the amps that we will ship out. No one will not get the old performance.

Only one thing that the amp has hard time cooping with is 10 - 15VDC on the inputs.

So if one plays around with frontends and is a bit reckless from time to time like me i would suggest installing a good capacitor on the front where there is place for it. 4,7uF (-3dB at 3Hz)

5 is sold out of 12 sets.

BR

Sonny
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Old Yesterday, 08:57 AM   #1586
vitalica is online now vitalica  Europe
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Over time I had several amplifiers from Sonny TSSAV1.6, TSSAV1.8, TSSA V8. I can say ,that every time , I'm surprised how good it sounds!
That's why I can not resist and I will order an A1V1.2 set. Today i will pay Paypal.
BR.
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Old Yesterday, 05:32 PM   #1587
vgeorge is offline vgeorge  Greece
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AK4490 USB Dac with dsd support.
Same here! Ordered one 1.2 amp and some power supplies.
I trust Sonny when it comes to amps!
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Old Today, 08:19 AM   #1588
AnthonyA is offline AnthonyA
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Sonny, can you tell us more about the preamplifier module? The best discrete version you got
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