Hey Throwback,
I took a look. I wonder if there is a way to embed Dropbox videos? I know when you share a YouTube link it just appears on the page as a video and is easier to watch etc.
I took a look.
The sounds are normal. In fact, when I turn on my PS-100 it makes a much louder noise. It’s normal and safe. I think that is magnetostriction caused by inrush current.
The second “plinking” noises are just the values changing temperature. That is normal as well. It’s parts of the tube expanding and contracting.
Hope that helps!