Royboy,
Teac E-3 is the same as many others, leave the plastic tip on.
You can test if it works using a paperclip first, hold the demag close to the clip and press the ON button, if the demag starts buzzing you have a winner.
Instructions:
Take the tape off the machine and turn the power off.
That is very important otherwise when coming close to the heads, 60 cycle current pulses produced by the demag will look just like 60hz audio signals to the heads and will seriously damage the electronics + VU-meters try to escape the room. :cry:
Sometimes it's also better to take the head-cover off so you can reach properly, it depends what reel to reel model you have.
So turn off the machine first.
Plug the demagnetizer in and 4 feet away from the recorder you push the on button. Move slowly in to the headstack .
Move the demag slowly up and down close to the head, not touching the head, and slowly move away (on button still engaged) at least 3-4 feet away and release the button.
NEVER let go of the on button when close to the head, that will do the opposite and magnetize the heads instead... :sigh:
After you do the playback-head and record-head + tape-lifters if your deck has that,you are done, skip the erase-head.
Congratulations ! :yes: