Mpp

[Benedetto]

Those are only for AC-Motors.
Therefore frequency and phases are widely adjustable.

[Joachim Gerhard]

Then a Premotec could be used for example.
We should really open up a new thread. I do not have much time the next 3 month though.

[Joachim Gerhard]

They also have DC motors ::: Premotec :: Brushless DC Motors ::

[Joachim Gerhard]

I tried to buy Morgan Jones book "Valve Amplifiers! 4th edition. It is sold out at the moment so it has sold very well.

[Joachim Gerhard]

Just in case we do not have luck with the current Starless balanced Fet input stage we can use this input stage in modified form. I also have an idea for a Fet version.

[Bonsai]

That input stage looks a bit strange. I'd return the collectors to the supply rails. I think this arrangement as shown will work for JFETs, but is sub optimal for bipolars.

[Joachim Gerhard]

Yes, returning the collectors to the opposite supplies gives a diamond buffer. That will work better, sure. The circuit shown is based on an idea of Baxandall who found that base and collector of a BJt can be on the same potential. It was used by QUAD and later others but with feedback.
I have a better idea that works fine. I have already build that input stage and presented it on this thread under the name "Hulk". I think i have that stage still lying around somewhere in perfect working condition. I will put it in the system tonight. As far as i remember, it sounded pretty damn good. Martina and i also used it on ETF2010 to good advantage.

[Joachim Gerhard]

I would really love if Sampler tries this modification.

[Joachim Gerhard]

Here are some pictures of the Hulk at ETF2010 taken by Jan Didden. One picture also shows Martina with Garrard and Hulk. The Hulk is also known since as the "Cristal" out of obvious reasons.
Yes Salas, this is one with your Shunts.

[Benedetto]

Martina looks really happy.