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ALPUY 31st May 2012 12:25 AM

Friends, I am to build a RIAA phono preamp. I am currently using a circuit-based pre Rod Elliott. I ordered the parts on eBay to build a SOLIDPHONO of TNT. as they say is based on the LEHMANN BLACK CUBE.
I would like your opinions on the project. step and advise me how to connect the in put, and published in the circuit in the negative input of TNT SSM2019 is connected to ground. It is so or not is connected to ground and remains balanced input?. Greetings Jose.

ALPUY 3rd June 2012 09:50 PM

Post the circuit. Josť.

kevinkr 3rd June 2012 10:10 PM

With inverting input grounded it is not a balanced input. If you want to use a balanced input configuration refer to the application note for input bias current path.

ALPUY 3rd June 2012 11:17 PM

I appreciate your information. Do you think of this circuit with its power supply. Is apparently based or clone of the Leheman Black Cube (expensive). Josť.

kevinkr 4th June 2012 02:53 AM

I don't think the supply is particularly brilliant, I'd like to see something closer to the Sulzer/Jung super regulator..

I was not terribly impressed with the black cube when I heard one. (A/B test against a cello phono stage and one of my own)

ALPUY 4th June 2012 03:54 AM

OK. I will investigate phono cello. Josť.

kevinkr 4th June 2012 04:20 AM

Cello phono is all discrete and probably a bit difficult to duplicate, but IMO not impossible. The results will be worth it if you can pull it off.

vinylkid58 4th June 2012 05:04 AM


Originally Posted by kevinkr (
I was not terribly impressed with the black cube when I heard one.

From what I've read, you're not the only one.


ALPUY 4th June 2012 05:03 PM

OK. Try to find information and CELLO circuits. The problem is that I bought on eBay and components to build the Solidphono. But in the world of DIY audio i never finished. If I can build it. Greetings and thanks for the feedback. Joseph.

kevinkr 5th June 2012 04:45 AM

Since you have all the parts you might as well finish it.. :D

Some modifications to the power supply should be possible by just cutting some etches and jumpering as needed.

It can serve as a reference for determining the merit of other designs and when superseded by something better you can just loan it out.

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