Fortunaltely i have a sony which warns when the videohead is dirty.I had to buy a cleaning cassette locally. Some (little) dropouts are visible in the video
Why should I clean my heads before changing to a different brand of tape?
Every different manufactured tape is slightly different ; These differences show up in the wear patterns or the deposits of microscopic dirt (or shed pieces) on the heads, the rollers, and so on. When a new make of tape is used the first time, it may pick up or disturb previous dirt, because its run pattern is a little different or it may be more or less abrasive. Many times people will try a new brand, and complain bitterly about the dropout and all the hits. It is often not the new tape, but rather dirt or shed particle from the earlier tape. So, it's a good idea to clean those tape heads with a cleaner when you change to a different manufacturer.
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