I remember only this scene from what I believe was a horror themed TV show from the '70s. 
I was born in 1970, so I think I watched it between 1973 and 1977? It was in color and it was seen on U.S. television and appeared to be shot on videotape, which is why I say it was a TV show or TV movie. It could have been British also because there was no dialogue in the scene.

In the scene, a medieval suit of armor, like what the old knights wore, is standing in a hallway like you see in castles in horror movies. It seems to come to life and comes walking down the hall and into the room of a sleeping boy, who looked to be about 8? years old and with brown hair, and then carries him back out of the room and down the hallway. This was a very scary scene and had a real creepy feel to it and it was at this time a grown-up said something like 'you shouldn't be watching this' or something like that and turned it off!

I also don't think it was "Dark Shadows", but I could be wrong. I seem to remember it was at night when I saw this. I know the British produced lots of television horror that was shot on videotape at this time ,so please, if any of you geniuses know this please answer this question that's been tormenting me my entire life!

Thank you!

P. S. 
It was definitely shot on videotape and had the look of a Dark Shadows episode. Someone just has to know this. Any guesses? Anyone?