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DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
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Old 2nd April 2018, 09:51 PM   #2931
Peterma is offline Peterma  Australia
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Join Date: Jan 2009
Location: From London to Sydney Feb 69
Mine is without op amp and it sounds great to my ears the best in my system. its a really a personal choice on SQ, it sounds as good as my AYAII TDA1541.
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Old 4th June 2018, 03:01 PM   #2932
gabdx is offline gabdx  Canada
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Join Date: Jan 2008
I am converting the output to Broskie tubes (differential+Unbalancer). I am currently using a discrete symmetrical transistor design with high feedback and regulators.
I did previously a 'lampizator' type of output for other I out dacs and it is horrible, I disassembled it after 1 minute of listening. Then I designed my own one stage cathode follower i/v or Voltage buffer and it was better for pcm56k (not worth it) and I concluded this is a very bad dac.
I started with 6n2pev (12Ax7 equivalent kind of) and sound was better but lacked details and too flat.
I did a previous tube conversion for AK4396 with one end of the signal directly to a 6n6p cathode follower and parallel cathode follower 6n6p, sound was too dark and mellow.
Right now I am using the discrete high feedback transistors, it sound 100x times better than the stock opamps but it is not the best for sound separation and space around instruments. Everything is more homogenous and bass especially is too clean with the feedback design, everything lacks texture, too polite sound.
In conclusion the discrete design is way better than only a single cathode follower. I bet that the 6sn7 would give a 10times better sound that the 6n2p or 6n6p Russian tubes which sound very bad in anode sound even bad in cathode follower which is unusual.
sorry for the introduction, now I have the choice of valves:
6DJ8(ecc88) Siemens
6SL7 tung sol or russian
EF184(6EJ7) from russia or from Realistic (gold pins)
5751 GE
12au7(ecc82) Silvertone.
I can use a 6sn7 for the second tube, a NOS from tung sol red base, haltron, FAA, RCA, Electronic tube.
edit: this is my 'over stock' tubes which I don't really have a use for now, I don't want to use ecc99 or other similar tubes or big triodes/pentodes which I keep for power amplifiers because I have a limited stock and paid premium for them.
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Last edited by gabdx; 4th June 2018 at 03:05 PM.
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Old 5th June 2018, 04:55 PM   #2933
carlmart is offline carlmart  Brazil
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Join Date: Mar 2001
Location: Brazil
Tried any chips like the ths4032?

This ia very highly regarded chip, and not many have tried it.
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Old 1st September 2018, 04:22 PM   #2934
Trileru is offline Trileru  Romania
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Join Date: Dec 2010
Does anyone know why this DAC broadcasts all audio on 172.0375 Mhz?

I had a play with a ham radio, and I couldn't quite understand why my computer audio was coming on that frequency. Pretty poorly, but for the moment I thought my home is bugged.
After shutting the DAC off, the broadcast stopped.
And the interesting part is that I swapped the op-amp with another opa827 (different package, still on dip adapter). Same thing.
I get the broadcast if I have output set on 48 or 96khz. On 44.1 or 88.2 KHz that broadcast is not on 172.0375 MHz anymore. Maybe it's on another frequency. I'll have a scan later on.
So, after checking in my country, that frequency is for government use. I'm not sure how powerful the broadcast is, but it triggers the squelch anywhere in the house. And I can faintly hear everything coming out from the computer.
Another implication - privacy. I'm basically broadcasting what I'm listening to.
Can anyone alse confirm this? And also, is there anyone that can explain what is happening and how I can stop this? I'm really enjoying this DAC.
BTW I'm using optical with the toslink adapter.

Last edited by Trileru; 1st September 2018 at 04:28 PM.
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Old 1st September 2018, 04:33 PM   #2935
carlmart is offline carlmart  Brazil
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Join Date: Mar 2001
Location: Brazil
It means you are listening the music you play on the DAC broadcasted? That's a first.

Is the DAC inside a metal box? Is it properly grounded to the box?
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Old 1st September 2018, 04:37 PM   #2936
Trileru is offline Trileru  Romania
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Join Date: Dec 2010
Quote:
Originally Posted by carlmart View Post
Is the DAC inside a metal box? Is it properly grounded to the box?

Yes and yes. It was when I last added the toslink adapter.
I can basically hear all audio output from my computer on a handheld radio on 172.0375 MHz, and it's enough to keep my radio channel squelch open anywhere in the house. In the bathroom I need to really focus on the words as there's static, but it's there. And it's dependant on the output settings.
I'm just getting into radio so I don't know exactly what I'm doing. I'm trying to figure out what's happening.
I'll use 44.1 and scan later on, to see if the radio frequency shifts.
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Old 1st September 2018, 04:59 PM   #2937
Trileru is offline Trileru  Romania
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Join Date: Dec 2010
I did a quick calculation to see if it's a multiplier thing and sure enough I found 88.2khz output on 158.0565Mhz. So are these harmonics? I can't find anything on 44.1khz output but it may be well below my handheld capabilities. And by this logic, 192khz output would be around 344.075MHz. Out of my handheld range.

Last edited by Trileru; 1st September 2018 at 05:02 PM.
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Old 1st September 2018, 05:02 PM   #2938
carlmart is offline carlmart  Brazil
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Join Date: Mar 2001
Location: Brazil
If it happened after you added a toslink adapter, you should start thinking on what it is doing. I would stat there.

Can you isolate it with a small transformer?
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Old 1st September 2018, 05:04 PM   #2939
Trileru is offline Trileru  Romania
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Join Date: Dec 2010
I'm not sure if it has anything to do with the toslink adapter. I just noticed this now.
I'll try to see what I can do later, but for the moment I just removed the audio cables and I can barelly understand the sound, but the handheld squelch is still triggered.
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Old 1st September 2018, 05:26 PM   #2940
carlmart is offline carlmart  Brazil
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Join Date: Mar 2001
Location: Brazil
Remove the toslink adapter and see what happens.

Where did you solder it to on the board?
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