This is generally accepted as the best non-commercial jerky dryer: Nesco FD-75PR
I really prefer the heater and fan being in the top rather than the bottom. Zero chance of the drips causing problems. I've done probably 50 batches on mine and it's still rocking.
I don't really measure, but I generally use the following:
1/2c parts worchestershire
1/4c part water
1/4c part soy sauce
2 tbsp Black popper
1 tbsp garlic powder
1 tbsp onion powder
1 tsp Cajun seasoning (slap ya mama)
1 tsp Ground Cayanne pepper
1 tsp #2 curing salt - optional, but I don't want to deal with any issues getting sick
I cut my meat into 1/4" strips on a meat slicer. Put them in the freezer for a couple hours and they slice much easier.
Marinate in that in the fridge for at least 8 hours, I let them go 24hrs.
Dry them until when you bend them the fibers on the top break apart. While hot, they will seem not done, but once they cool down, they should be perfect. I over-dryed my first batch because I thought to myself, no way is this done. You'll get the hang of it.
I do not like grinding the meat and using a gun. IMO, that's not jerky and I don't enjoy the texture at all. Use a very lean piece of meat, top round is best, then bottom round, eye of round is good, flank can be used too. Don't use anything from the front shoulder.