Cleaning of Tektronix AM503 Current Probe Amplifier

One of the most valuable instruments in my collection is the Tektronix current measurement system, which consists of an AM503 probe amplifier and the accompanying A6302 AC/DC probe. While the probe itself doesn’t need much attention beyond the occasional wipe to remove dirt from the jaws, the amplifier recently became quite noisy in several attenuator positions. So, I decided it was time for a thorough spring cleaning.