Eliminate RF in a Tube Amp Part 2

This is a high-level explanation of capacitive coupling, the calculations (simple math), and why the baffle shield is effective. I also discuss why ferrite beads on the input signal are not effective.
The tube amplifier is a voltage amplifier. However, the capacitive coupling injects current (flux) into the circuit. Therefore, a spurious signal that injects a few mA in the preamp is a problem whereas a few mA in the power section is typically not a problem.
I show the math behind the cell phone aliens.
Original Work, Copyright 2016 James D. Whiteside, II all rights reserved, For consideration only, no reproduction without prior permission.