NEW L12/2 version 5. I have just received a pair of these amplifiers, I stopped testing because the boards are unstable

[Vit4min4s]

I´d like to repeat again to please clear up if the emitter connections of Q11 and Q13 are really going to the out node or the collector nodes of Q14/15 and Q16/17.

Calvin, to clarify your question I attached the board photo were you can clearly see the emitter of the C4793 connecting to the collector of the 0302G and on the negative side the same. Thanks

 

[Vit4min4s]

This is how it is working now, the drivers are colder with the 100R resitors, unfortunately it does not sound as clear as the previous version. It looks that the cascode input stage on the Version 4 works better. I dont have any equipment to make further measurements.

 

[Vit4min4s]

I am designing a new pcb to use the components. This is an example of one of the inicial layouts for the version 4. It is 45x100mm for panelization. It is possible to make 10 boards for 2€. 😉