Show screen grid tubes give much more amplification the screen grid tube Is 19 a high amplifier consequently by using a given number of standard tubes and comparing them with screen grid tubes 1 altering the circuit to provide high plute plate load impedances ces for screen grid plates one finds the screen grid tubes give much more amplification they have been called the greatest advance in radio tubes in five years operating in the other direction one may reduce the size of the antenna deiy very considerably when using the screen grid tubes eveln down to five feet of wire dangling behind the receiver the volume may be as great as it was when a long high outdoor antenna was used with other tubes therefore if one reduces the size of his aerial and gets the same volume some borne wonder whether the extra cost of 66 screen grid tubes does any more than enable one to reduce antenna s size ize an extra cost of several dollars compared with a saving of an old stretch of wire |