A friend recently noticed an issue with one of his Z4000 transformers. While running two postwar Trainmaster engines in tandem, and pulling a rather heavy string of postwar coal hoppers, he noticed what sounds like a "buzzing" noise. He was running at 11 volts and pulling about 6 amps. The noise seems to increase/decrease with corresponding changes of throttle. The noise occurs only on the Track1 side (tried same engine set on Track2 throttle with no noise).
Does not sound like cooling fan noise to me, more like what you might hear from a postwar ZW with a loose coil stack maybe. The transformer is at least 10 years old (original owner) with no other issues and, at least for now, the noise doesn't seem to affect performance.
Has anyone experienced a similar issue with a Z4000 and, if so, is there a fix? I did try a forum search before posting with no luck. Thanks!
