Masterpiece

[Stefanoo]

I will take the honor to post the 1000th post!!!

Thanks guys for the interested shown so far to this thread!

 

[RCruz]

merlin took the 1000th post

 

[Joachim Gerhard]

By magic ?

 

[MiiB]

Brianco, what a neat little stream in that picture. Some amazing leaping sights

 

[merlin el mago]

By magic ?

Accidentally.

 

[Stefanoo]

merlin took the 1000th post

NOOOOOOO!!!!!

On the board though, however marked post #1001 it is. The 1000th reply...!!

Marlin is just a magician...ahahahahaha...


BTW I am still listening to he prototype of my masterpiece and it is pretty darn good. I just finished the new layout for the super shunt and today I am starting on the main board.
I hope to be done by middle next week and order boards.

Phono board won't have output stage, as I will have two extra boards with Calvin buffer and my super buffer with IF3602.
This way it will be possible to just plug in ti try and decide between the two.

Mor details will follow.

 

[Joachim Gerhard]

Very good, how high is the noise ?

 

[Stefanoo]

Very good, how high is the noise ?

I haven't measured it as I think it makes no sense to measure it on a prototype with all wires hanging out.
However at listening it sounhds extremely silent and I have the impression it is actually quieter than Paradise.
This being said, to make a real comparison and matching with the simulation final prototype will be needed.
At that point I will make noise measurement with the spectum analyzer to say it for sure.

What impact me the most is the openess and clear sound crispness and power.
I am really curios to see if Calvin buffer will perform better.
As for now it is hard to imagine it can even sound better...but time will tell I guess.

 

[Joachim Gerhard]

The Paradise is very quiet so when your Masterpiece prototype is even more quiet this is an achievement.

 

[Stefanoo]

Of course!! Paradise is super quiet!!
Like I said...I need to make a whole set of measurements before stating that masterpiece is quoted than paradise.
Hopefully in a couple of weeks I will have a first complete prototype!

 

[Stefanoo]

Joachim...I am going to start entering into layout.
Would you like to quick review the schematic for the main board to see if I missed anything?
Just a mini review 2 sets of eyes is better than one

 

[buzzforb]

stefanoo,
Did you spend any time testing BCP53/56 for ideal operating conditions? I will be using them in a preamp soon, as they seem like very nice complimentary pairs.

 

[Stefanoo]

I think they sound pretty good and I keep using them in my implementation.
For me it's one of the most pleasing/more neutral sounding medium power BJT I have tried so dfar.
The sound pretty good at about 10-15mA.
I wouldn't use them as input devices though.
Very good for cascoding or as current mirrors such as in this applucation.

 

[buzzforb]

I was thinking cascode, leaving the CM dities up to zvn/p 4424gta

 

[Stefanoo]

It seems to be a good choice.
I also encourage you to try BCP for CM like I do here.

 

[buzzforb]

Will do, although the zvp will have a little more grunt. Gonna try CM and folded cascode output.

 

[Stefanoo]

yes ZVP is a very good powerful part. BCP is got less byte than that one but it is a bit more neutral.
If you get to compare them direcly I would be interested to know your opinion.

 

[Joachim Gerhard]

Schematic looks good but where is the servo ?
I think you left it out because there is also no buffer.

 

[Stefanoo]

Schematic looks good but where is the servo ?
I think you left it out because there is also no buffer.

Yes servo is on a little separate board as well for testing purpose.
However at the end the PSU and servo will be pluggable modules on the final product.
It will be built dual mono with batteries and control circuitry for the battery on one chassis....but control for the battery will come later...

 

[Stefanoo]

BTW just out of curiosity....who rated this post with a lame one star??

Can we start giving a good rate to this thread?! Ahahahahaha...