NAD M28 7 Channel Purifi Amplifier Teardown

[mocenigo]

Thank you for posting the internal pics.
View attachment 251746
What are these daughter-cards on 12pin headers: OpAmps? Pics?

I do not think they are opamps because there are some integrated ones clearly to one side of each and between the balanced and the unbalanced inputs. Maybe control logic, or discrete regulators.

 

[pseudoid]

I do not think they are opamps because there are some integrated ones clearly to one side of each and between the balanced and the unbalanced inputs. Maybe control logic, or discrete regulators.

Possibly 8pin JFETs (2x?) on each daughter-card...

 

[mocenigo]

Possibly 8pin JFETs (2x?) on each daughter-card...

You conjecture JFET-based voltage regulators?

 

[danielsmi]

I'll try and see if I can get some better pics soon