http://www.ladda-upp.se/files/2015/b145773.png
~14 to 17KHz

As you can see there's some interference, the signal is very similar to a video-signal, because if I were to plug in the video out to my audio-input on the computer it looks almost the same.

Could it be that the audio-head in the VTR is misaligned and is just barley picking up the video signal?

/Solouplay