New LDR6 Passive Preamp using light dependent resistors - diyAudio
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Old 14th October 2012, 02:53 PM   #1
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Default New LDR6 Passive Preamp using light dependent resistors

Hello out there.
Wanted to introduce ourselves and let you know about our new LDR6 Passive Preamp. Six line stage inputs. Digitally controlled analog LDRs. Comes with remote but also fully controllable via single multi-function encoder knob. Sounds wonderful because LDRs just do.
Check it out.
Questions/inquiries welcome.
Cheers,
Morten
Tortuga Audio - Handcrafted audio gear for music lovers

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Old 22nd October 2012, 03:05 PM   #2
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Hi All!!

We've received inquiries regarding future plans to offer our passive preamp with only a single input and perhaps 2 or even 3 outputs.

We'd be delighted to hear from you on what configuration/features you feel would be most desirable.

Fire away!!

Cheers,

Morten
Tortuga Audio - Handcrafted audio gear for music lovers
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Old 30th October 2012, 06:20 PM   #3
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Default Single Input LDR1 Passive Preamplifier Coming Soon!

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We've completed the design work on the LDR1 version of our Passive Preamplifier. Here are engineering/artwork pics of the new front/rear panels. The LDR1 will have a single input and dual outputs. Otherwise the same functionality as the LDR6. Hope to have panels from the fabricators by mid-November so we can start delivering LDR1's!
Cheers!
Morten
Tortuga Audio - Handcrafted audio gear for music lovers
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Old 23rd November 2012, 02:49 PM   #4
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Default Tortuga Audio Releases LDR1 Passive Preamplifier

Happy Thanksgiving Weekend!

We're pleased to announce the release of the LDR1 Passive Preamplifier that uses digitally controlled analog light dependent resistors for attenuation with exceptional sonic performance. The LDR1 is a single input, dual input preamp. The LDR1 is built around the same technology and design as the LDR6 which has 6 inputs and a single output.

More info can be found at Tortuga Audio | Handcrafted audio gear for music loversTortuga Audio

Cheers!

Morten

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Old 23rd November 2012, 03:12 PM   #5
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Thanks! Will there be a balanced version?
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Old 23rd November 2012, 03:25 PM   #6
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Quote:
Originally Posted by ackcheng View Post
Thanks! Will there be a balanced version?
We are considering it but a final decision to develop/offer would depend on the market demand for a balanced unit. While we haven't done any design/optimization on this configuration I suspect the current form factor would accommodate 3 balanced inputs and 1 balanced output using XLR connectors but not six like the LDR6. Perhaps an LDR3B?

A balanced configuration would double the number of LDRs from 4 to 8 for each input along with the doubling of the core control hardware. The same microprocessor could be used since it has sufficient spare input/outputs. Of course a revised board would need to be designed but there's sufficient real estate for this. The software modifications should be relatively minor.

Minor variations in LDR performance can be corrected for within the software as is currently done with the unbalanced LDR1/LDR6. Doubling up the number of LDRs that need to be closely matched gets a bit messy but I believe it's entirely doable by extending the same testing and matching methodology and tools we currently use for the unbalanced version. I frankly wouldn't even think of executing a balanced LDR design if we didn't employ a software based digital controller.

Most likely a balance unit would be priced higher due to the additional hardware and time to assemble, test and fine tune a more complex design but I wouldn't venture a guess by how much until we got further into the design mods/planning.

I'm curious to know your views on using balanced signals. Do you favor it generally regardless of signal path length or do you have long runs between source & amp which are more susceptible to noise/hum?

Would availability of an balanced unit be a key factor in a buy decision?

I would welcome any additional comments or insights you or other readers have on the subject of a balanced LDR passive preamp?

Cheers!

Morten
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Old 9th December 2012, 01:35 PM   #7
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Check out the recent user review of our new LDR1. High praise indeed!

"Let me state up front that the LDR1 is the most pure, neutral, transparent, noise-free and grain-free component I have ever heard." - Forum | Tortuga AudioTortuga Audio

Cheers!

Morten
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Old 6th January 2013, 07:22 PM   #8
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Nice review of our LDR6 Passive Preamp on HiFiPig.com.

Quote:
There is just a sense of absolutely everything having been stripped free of fuzz and imprecision. Instrumental placement isnít approximate or inferred. Instead, instruments are precisely located at a fixed and exact distance from the others with the space between performers and the characteristics of the recording environment jaw-droppingly obvious.
Quote:
Ö the LDR6 produces a sound completely free of colouration, with a soundstage that was just consistently deeper and better resolved than with any other passive pre-amp I have ever used.
Quote:
Ösuitably matched, sonically, the LDR6 is an absolute gem. Jaw-droppingly transparent, with faultless microprocessor control, this pre-amp provides a level of transparency usually the domain of hair shirt enthusiasts, with the convenience of remote control.
Quote:
Itís possibly the most transparent pre-amp Iíve yet used.
Full review can be found at: Tortuga Audio LDR6 Passive Pre-amp | Hifi Pig

Cheers!
Morten
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Old 16th January 2013, 06:22 PM   #9
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We're making progress on the balanced version of our LDR Passive Preamplifier. Here's a couple of pics.
More info can be found here.

Cheers!
Morten

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Old 17th January 2013, 12:35 AM   #10
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Remember to connect each XLR pin #1, directly to the chassis and not to the audio circuit ground.
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