MPP

[reinhard]

Fully differentially is a network between the two phases.

Two networks to ground are not differentially.

Reinhard

 

[Joachim Gerhard]

Sure. My FPS is fully diffential though as far as i can tell.

 

[mzperx]

How did you modify the Soundcard ?

OPA1612s are risponsible for the results. See the "before/after" details in excelsheet.

Does the Hagerman implement the Neumann "pole" and is this the reason for the rising response towards 20kHz ?

I don't know. May be I left a related jumpers in wrong position. Or 100R output impedance of souncard instead of expected 50R could couse it?

 

[jacco vermeulen]

have you ?

Pretty parts and construction, but as exciting as a Lexus.
Given the choice between 16 parallel parts or INA/AD797, i'd sooner pick a BB & AD Käfer Klirraudio (© Herr Löesch) balanced-ref for less than half the C27 cost.

Goes for all AccuPhase gear, long time ago i was rather impressed by the P102 balanced power amp till audit time. Deliberate market choice by the Yokohama brand, i assume, no thrills and no surprises.

(i loathe horns and anything fullrange high efficiency, had a ball at ETF , pretty S/N numbers for moving coil are not on the top of my list)

I do need a cell phone with prettier pixels.

 

[Joachim Gerhard]

Mzperx, you choose to not disclose your circuit, neather on the phono, nor on the soundcard modification. That´s fine for me but i can not comment any more detailed that way.
One channel of the Super Pocket Phono is working and the other channel is ready soon.

 

[Joachim Gerhard]

Here are some pictures.

 

[Joachim Gerhard]

Here is the circuit diagram and an alternative input section.

 

[RCruz]

What type of resistors are you using ?

I really like your hard core p2p builds 🙂

 

[Joachim Gerhard]

Thanks, they work very well. The resistors are sold under the Yageo brand but made as far as i know in Germany at Vitrohm. It is a 1% metal film. They are inexpensive but very good. I use them in prototypes and less expensive gear. Maybe i can find the specs.

 

[Joachim Gerhard]

here we go....

 

[Joachim Gerhard]

here is some more recent information.

 

[Joachim Gerhard]

The file is a little too big to upload but you find it on the Yageo website under MF0207.

 

[RCruz]

Thank you again Joachim 🙂

What about those smd EL´s.. what brand are those ?

 

[Joachim Gerhard]

They are Pannasonic VF ( silver-black ), similar to FC but smaller and Chemi-Con PXA organic ( silver - blue ) super low ESR.

 

[Joachim Gerhard]

The Super Pocket Phono is playing. Today i put it in a cabinet and build a PSU.

 

[mzperx]

Mzperx, you choose to not disclose your circuit, neather on the phono, nor on the soundcard modification. That´s fine for me but i can not comment any more detailed that way.

Joachim, I'm sorry but I didn't plan to put the whole schematic here.
Regarding the soundcard modification as I already wrote that the significant improvement was achieved by changing of the opamps to OPA1612. In noise respects virgin E-MU1212m is good as is, but the distortion can be reduced well.
You can find further details here:
http://www.diyaudio.com/forums/digital-line-level/107643-e-mu-1212m-sound-card-thread.html

 

[Joachim Gerhard]

Thanks, i really do not need another phono circuit. I tested around 400 in over two years, puuuuu. Thanks for the link. i am setting up Audiotester and this really helps.

 

[hesener]

400.... thats a lot ;-)

are you talking about the audiotester software? I am using that too and I really like it. Just finished building my own preamp for a Terratec Phase24 sound card and it works quite nice with that software

have a nice weekend alll

 

[Joachim Gerhard]

Yes, Audiotester software.

 

[hesener]

just a little teaser.... the frontplates have arrived, in the process of building, timing permitting....