PP CFB toroidy OPT

[LKA]

and FFT 1k/10W/4R5 in REW

 

[trobbins]

It's interesting that the 100Hz ripple modulation sidebands are about 20dB lower than the dominant harmonic levels.

And the IMD levels are also not (as I see it) significantly influenced by ripple sideband levels, although they show up (eg. in the 13-14kHz tones).

In either case, there is only a very low 100Hz signal showing, which is interesting, and seems to show the performance of PP output stage balancing.

 

[LKA]

the modified (mosfet cap multiplier) HT PS gives much more cleaner spectrum

 

[gionag]

If you are going toward the cleanest HT PS... give a try to the revised maida regulator.
i think you can find under "21st century maida".

I have used myself for a bipolar HT power supply (+/- 130V) and it performs absolutely amazingly.

 

[ArthurDK]

And then comes the important question. Which configuration sounded the best?
And are you completely satisfied with the amp?

BR
Arthur