Yes. The hum was on three of five videotapes in a set I bought when I decided to transfer them six months ago. Now four out of the five have the hum when played on a VCR. Soon probably the fifth one will go.
It's a common thing -- for me at least - with older videotapes. These tapes date from the early 1990s. The soundtrack seems to go before the video does. I've seen this happen on professionally made videotapes as well as ones I recorded myself. The hum is on the source material. I transfer the videotpes to DVDs by hooking the outputs of the VCR to the inputs of a Magnavox DVD recorder. If the source material is clean, this method works perfectly. If the track is bad to begin with it becomes garbage in, garbage out.