I always looked at it this way. In a combo unit, if the TV breaks, then the VCR is useless. You couldn't hook it up to another TV. VCR's, which have mechanical parts don't last nearly as long as TV's. If one breaks, when (if) you send it out to be repaired you lose your TV and VCR or if you decide not to have it fixed, then you have to replace both. Oh wait...that wasn't your question, was it? I'd say it's either a poor quality unit or you just happened to get a bad one. I had two of the same VCR, one hissed, one didn't. I'd think that a combo unit would be less likely to have noise problems since they were designed together and there are not long cables to pick up interference.