Don't fail to keep the leads to the vacuum tube as short as possible.
Don't throw your receiving set out of the window if it howls. Try placing the audio-frequency transformers farther apart and the cores of them at right angles to each other.
Don't use condensers with paper dielectrics for an amplifier receiving set or it will be noisy.
Don't expect as good results with a loop aerial, or when? using the bed springs, as an out-door aerial will give you.
Don't use an amplifier having a plate potential of less than 100 volts for the last step where a loud speaker is to be used.
Don't try to assemble a set if you don't know the difference between a binding post and a blue print. Buy a set ready to use.
Don't expect to get Arlington time signals and the big cableless stations if your receiver is made for short wave lengths.
Don't take your headphones apart. You are just as apt to spoil them as you would a watch.
Don't expect to get results with a Bell telephone receiver.
Don't forget that there are other operators using the ether besides yourself.