The Red Light District - another PP EL84 amp

[yagoolar]

Originally Posted by SY

The Mullard datasheet has plenty of info on ultralinear. If that's the route you take, you have to work out a different way to adjust the idle current.

I guess I see - in RDL it is done via Ug2 voltage regulator which in UL setup cannot be used.
Less distortion less power?

Thanks for the tip with Mullard datasheet.

[SY]

Originally Posted by 6L6

Are there any circuit boards available for this project? I have a perfect donor amp to build this...

Nope, but the circuit is so simple, point-to-point should be easy- I have photos on my website (and downloadable drilling diagrams for the top plate) illustrating the layout. If someone wants to design boards and sell them, I have no problem with that.

Originally Posted by yagoolar

I guess I see - in RDL it is done via Ug2 voltage regulator which in UL setup cannot be used.
Less distortion less power?

You don't really get less distortion. With UL, the open loop gain is lower, so there's less feedback. That tends to raise distortion. Now, we're talking about pretty small differences, but why not enjoy the extra power if it costs nothing in linearity?

[yagoolar]

You are right. New projects have been waiting for a long time.