MPP

[Joachim Gerhard]

Very low 1/F noise for a J-Fet.

 

[Salas]

Old Japanese good stuff. JC has a cupboard of those probably, I only have a few matching from just a handful.

 

[Joachim Gerhard]

2SK147V ?

 

[Salas]

I knew that you knew, LOL.

 

[Joachim Gerhard]

Noise is my hobby.

 

[MiiB]

Sure you make a lot of noise..

 

[FdW]

Noise is my hobby.

The Tremeloes - Silence is Golden - YouTube

 

[hesener]

Paradise group buy is closed now at 544 boards (!!)..... we will now proceed with all the organisation, and hopefully in autumn we will have another nice thread with building stuff, gallery and listening impressions ;-)))

 

[FdW]

Paradise group buy is closed now at 544 boards (!!)..... we will now proceed with all the organisation, and hopefully in autumn we will have another nice thread with building stuff, gallery and listening impressions ;-)))

Impressive, just impressive, very very impressive. Who would have thought.

More than 1000 shunt PSU's eating multiple KW's to go 'online' , amazing!

 

[RCruz]

Impressive, just impressive, very very impressive. Who would have thought.

More than 1000 shunt PSU's eating multiple KW's to go 'online' , amazing!

Just powered my first R2 shunt.... wonderfull... +-18V steady ... Now I will populate the second board (the second is always easier)... hope to have a listen in 1 week

 

[RCruz]

As JG said. Plus you can arrange plenty extra current (with a heat penalty) to lower the parallel output circuit's impedance.

So that is why more current provides better headroom and more spacious sound

 

[FdW]

So that is why more current provides better headroom and more spacious sound

(I think I said it before ) I like HOT-running electronics.

(As D.Self added to an amplifier) You could add a Summer/Winter setting on the shunt

 

[Joachim Gerhard]

You make a lot of noise too Michael, we are speakers builders

 

[Stefanoo]

So that is why more current provides better headroom and more spacious sound

Interesting, I alwaays found the sound to be more agile, faster, more dynamic by lowering the current on the shunt.

 

[FdW]

Interesting, I alwaays found the sound to be more agile, faster, more dynamic by lowering the current on the shunt.

Lowering the current in the CCS of the shunt can be dangerous, when lowered to far you may starve the current supply to the attached preamp and that may not be a pretty sight (on the scope, even invisible on the universal-meter (if lowered just below the demand)). It may even provide a somewhat crisper sound. http://www.discogs.com/Death-Sentence-Not-A-Pretty-Sight/release/2346820

 

[Holger Barske]

Interesting, I alwaays found the sound to be more agile, faster, more dynamic by lowering the current on the shunt.

This is exactly the opposite from what I found: Shunt reg sound becomes really good if you burn your fingers on the heat sink

 

[Stefanoo]

Lowering the current in the CCS of the shunt can be dangerous, when lowered to far you may starve the current supply to the attached preamp and that may not be a pretty sight (on the scope, even invisible on the universal-meter (if lowered just below the demand)). It may even provide a somewhat crisper sound. http://www.discogs.com/Death-Sentence-Not-A-Pretty-Sight/release/2346820

When I mean lower it I mean, giving a margin of 15-20mA instead of 50-70mA, so the circuit doesn't starv.
But you pointed out an interesting consideration that I will keep in mind for future reference!

 

[Stefanoo]

This is exactly the opposite from what I found: Shunt reg sound becomes really good if you burn your fingers on the heat sink

mmmm interesting! What is the sonic impact by increasing the current on the CCS?

 

[Joachim Gerhard]

The room heats up, that makes the speed of sound lower so we get more bass and the treble does sound less sharp

 

[Stefanoo]

The room heats up, that makes the speed of sound lower so we get more bass and the treble does sound less sharp

wow, that is interesting!!! wow!!!
That is exactly what happens!! So what about this amplifier in Class A that heat up a lot?