Shipped an interesting unit today

[doshiaudio]

A couple of months ago I got a phone call from an existing customer. Went something like this :

"Hey Nick, I'm sitting on the beach in Mexico and thinking about audio"

So instantly i'm thinking, crank call, but I recognized the voice so I kept talking.

"How about we build a phono pre with metering but we also incorporate something like the functionality of a phase meter to assist with cartridge setup"

I could do metering with Left / Right channels and have it switchable to Sum and Difference information. This way, with the help of a suitable test record you could fine tune azimuth - I said without thinking (congenital defect)

"Cool, Lets do it"

It WAS a great idea and after a lot of work building the circuitry around the metering. The photos below are the result. This phono stage has 1 Stereo MC input( Adjustable load / 70db total gain), 1 Mono MC input and one MM input (10K ohms/52db)

it has a switchable 20HZ IEC Rumble filter , Adjustable gain on the stereo MC and adjustable VU metering 0/+4

I have been working on a evolution of the MC head amplifier and this circuit change has been implemented in this unit. Results in an even lower noise floor, better dynamics and lower distortion.

 

[steve williams]

Looks nice Nick

 

[still-one]

Nick
Will you be showing this unit a Larry's Paragon event on the 21st? It looks great.

Jim

 

[doshiaudio]

Thanks, How are the knees doing?

this is a short video - the unit was not fully finished and you can see the upper chassis isolators. Cookies for anyone who can id the music

[video=vimeo;110931470]https://vimeo.com/110931470[/video]

 

[doshiaudio]

good idea - the owner lives in Michigan. I will ask

Nick

 

[c1ferrari]

Very attractive, Nick

 

[doshiaudio]

Thanks,

The owner has very graciously allowed us to use this unit at the Paragon Sight and Sound Event Nov 20. WE will be demonstrating the preamp with a Brinkmann Turntable with 2 arms one of them with a Mono cartridge as well as using the unit's flexibility to demonstrate the new Transparent Audio Phono cable with a differential network.