my store bought dehydrator has a fan and a light bulb for heat.
It does meat at 145F, your ovens lowest is a little hotter. I just use whatever feels right in my marinade; crushed garlic, liquid smoke, worcestershire, tabasco, salt, maple syrup, scotch whisky. Not enough salt, hot spice, sweet, are the only things ive found that make it less than excellent. It takes only 8-10 hrs. Buy your steaks with little fat, as thats what will go rancid.