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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: PP output studyPosted by N-set on: 12/8/2020
2) OUTPUT STUDY
I decided to check what my PP outputs. After some listening my HF is harsher than I would like plus on older equipment (like Sansui TUX1) I can sometimes hear a gentle transformer whistling, suggesting high harmonics. Plus the omnipresent 20KHz noise, I measure everywhere (in the output, around the cables, in space around the phono).
Here is the PP output, ONLINE mode at 180W amplifier load:
And its FFT (RED TRACE):
One can clearly see the 20kHz and its harmonics riding over the sine plus some trash around 3kHz.
For comparison, here is the BYPASS mode (so the wall power) same load:
PP BATTERY operation:
I also checked switched the PP to 220V. Seems marginally better around 3kHz area (online mode below):
Romy, I remember seeing such waveforms, HF riding on a sinus, when you studied your PP. What were your conclusions?
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