I decided to add some temporary filters across the internal device after checking it - one section of this multi-section capacitor is dead, the other two sections are >80Ω ESR. (ESR is equivalent series resistance, a measurement performed at an AC frequency. Capacitors tend to increase in impedance to AC signals as they get older and wear out, high ESR means the device is dead.) Three 10μF @ 450V capacitors were paralleled with the original, and the noise level immediately dropped to a more reaonable 0.5V peak-peak with a ripple, instead of the 11.6V peak-peak wave from yesterday's post. The original capacitor is most certainly bad, and will get replaced by the devices in the photo, once I can remove the old unit. The device still has problems, probably other leaky capacitors. I may just rebuild the entire device and recalibrate it with new 1% parts. https://poal.co/s/oldtechnology/742729