Topic: Lunatec V3 ADC Upgrade

[blee421]

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...

 

[Gutbucket]

Thanks.  My understanding was that the Ode mod replaced the ADC chip, but maybe it replaced those same buffers.  Anyone know the specifics?

[steve4134]

Well shit..........you want to buy another V3 let me know. Coax / optical mod.

Steve

[jb63]

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.

[audBall]

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?

[DSatz]

I didn't see this upgrade mentioned anywhere on gracedesign.com; does anyone have a link to where it's described?

[Gutbucket]

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