Is it possible (and easy) to dehydrate meat in oven?
If your oven goes down to the correct temperature then you won't have a problem.  My oven goes down to 75C and I've done plenty of beef jerky with it.  If the oven isn't a convection oven it will take longer and it helps to flip the meat halfway through.
My previous oven was a gas oven that didn't have as precise control of the temperature, so I turned it off when it got too hot and back on again when it cooled down.  You do have to keep an eye on it then, but it is doable.