MPP

[Joachim Gerhard]

I am sorry about that. I used quite a few.

 

[jan.didden]

I am sorry about that. I used quite a few.

If you need 100, we can talk ;-)

Jan

 

[n3mmr]

So if you can make and sell 100 units, you might be able to pull it off?
What would be the price?

 

[jan.didden]

Probably close to € 100 ... Maybe just below. IF I could get the parts.

Jan

 

[Joachim Gerhard]

I made a Pre-Pre. It works well. Maybe it can be improved.

 

[as_audio]

Pls correct the lowest transistor.

 

[Joachim Gerhard]

……..

 

[as_audio]

Which input do you use (or both, balanced ?) and how do you define the gain ?

 

[Joachim Gerhard]

Balanced. Gm x 220,

 

[as_audio]

I do not understand the formula. Input impedance is also a consideration.
Do you consider this a true balanced ("symmetrisch erdfrei") input - no.

 

[Joachim Gerhard]

Not really but there is very low hum.

 

[as_audio]

I had three remarks but who cares.

 

[Joachim Gerhard]

?

 

[Joachim Gerhard]

The coil Impedance matteres two.

 

[Joachim Gerhard]

The higher the coil Impedance, the lower the gain. This is basic I/u.

 

[studiostevus]

I've had the paradise assembled but unused for 10 years, while I did several intercontinental moves. I'm ready to complete it now, however in the past 10 years we've had some changes to the family which makes shelf real estate a rare commodity. I previously used this big honking Italian boxes, but I just don't have the space for them anymore (amp, preamp, phono stage, record player... family says no!)...

What would be the smallest form factor you guys have seen in which to successfully box up the MPP? Especially given the sensitivity to RF etc.

 

[as_audio]

For this a picture of all that you have would be useful.

 

[studiostevus]

This is what came out of the shoebox…. Obvious candidates are the banks of capacitors which a salvaged from an old project. But even after that, how to use real estate efficiently…

 

[sq225917]

First off, check that trim pot...

You need ventilation for the main boards, the psu can be shoved anywhere.

 

[Hans Polak]

@Joachim Gerhard
Hello Joachim, when I remember correctly, you mentioned a while ago that you had in mind to attempt building a pre-pre for an optical cartridge.
Did you succeed in any way and if so, could you reveal some of the results ?

Hans