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Author Topic: Lunatec V3 ADC Upgrade  (Read 1008 times)

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Offline blee421

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Lunatec V3 ADC Upgrade
« on: June 04, 2024, 01:32:35 PM »
I recently sent in my two Lunatec V3 units to have the ADC's upgraded. The cost was $100 per unit. I sent in the two V2's I own earlier and after they were tuned up I asked if there were any upgrades that Grace does for the V3's that are similar to what Oade Bros was doing. I think they call it a "concert mod". I might be wrong about this but their website says $175 for the upgrade. Anyways I asked Alex Vallejo with Grace to send me specifics on what's being done so that I could share it with all of you fine people.

Hey Brian,

I replaced the AD712s used in the trim/HPF buffer and ADC input buffer with OPA1652 as per Mike's recommendation. I just compared stock unit to modified and distortion + noise is negligible, ~1dB improvement. ADC Dynamic range is 2-3dB better. Is the mod worth it? Guess you'll have to try it out...

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Offline Gutbucket

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Re: Lunatec V3 ADC Upgrade
« Reply #1 on: June 04, 2024, 02:44:45 PM »
Thanks.  My understanding was that the Ode mod replaced the ADC chip, but maybe it replaced those same buffers.  Anyone know the specifics?
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Offline steve4134

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Re: Lunatec V3 ADC Upgrade
« Reply #2 on: June 11, 2024, 04:44:14 PM »
Well shit..........you want to buy another V3 let me know. Coax / optical mod.

Steve

Offline jb63

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Re: Lunatec V3 ADC Upgrade
« Reply #3 on: June 11, 2024, 05:42:07 PM »
If it helps, the OADE ACM mod affects the digital out only leaving the analog out unchanged. Whenever I have an extra channel I run both outs so I have a lot of examples if you need any.

http://taperssection.com/index.php?topic=79244.0;all

I haven't found a mod of anything I like as much as this, but its a giant heavy piece of kit for 2024.
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Offline audBall

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Re: Lunatec V3 ADC Upgrade
« Reply #4 on: June 11, 2024, 08:27:11 PM »
I replaced the AD712s used in the trim/HPF buffer and ADC input buffer with OPA1652 as per Mike's recommendation. I just compared stock unit to modified and distortion + noise is negligible, ~1dB improvement. ADC Dynamic range is 2-3dB better. Is the mod worth it? Guess you'll have to try it out...

Thanks for sharing, Brian.

In my stock version, I see three AD712s and one PCM1804 (a 24bit/192kHz stereo AD converter). According to this link, the AD712 is an op amp. Was the AD chip left unchanged?

Does anyone know which chips get replaced by Doug?
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Offline DSatz

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Re: Lunatec V3 ADC Upgrade
« Reply #5 on: June 16, 2024, 02:40:10 PM »
I didn't see this upgrade mentioned anywhere on gracedesign.com; does anyone have a link to where it's described?
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Offline Gutbucket

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Re: Lunatec V3 ADC Upgrade
« Reply #6 on: July 01, 2024, 10:30:55 AM »
Not a much info on it, but here is a link to the page on it at the Oade Brothers Audio website- https://www.oade.com/index.php?main_page=product_info&cPath=19&products_id=96
musical volition > vibrations > voltages > numeric values > voltages > vibrations> virtual teleportation time-machine experience
Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<< (note: This is a 1st draft, now several years old and in need of revision!  Stay tuned)

 

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