Thanks a lot. I might have figured something.

If you look at the SMD resistor I marked in the fuzzy photo, you will notice that it's marked 154 in the pic of the "new: version board and 224 in the pic of the old version board. You said that the old version boards isn't "screaming" while the new version board does.

Now, my RX18, which is the "old" layout,isalso screaming. I took a careful look at it, and noticed I also have the 154 SMD resistor (which is 150 kilo ohm) instead of the one marked 224 (which is 220 kilo ohm).

I don't think this is a coincidence, particullary considering the factthat all the other components in that area of the board are identical.

I wonder what other components are different between your "old version" and mine, and if we can trace the "screaming" motos back to them.