The dial illuminating bulb should give service for approximately 1000 hours. Should it burn out, a replacement can be purchased from any Atwater Kent dealer. This lamp is type T-3 miniature base, 2 1/2 volts. It is located just behind vertical sub-panel under large metal shield (see Fig. 3), and is removed by simply taking off this shield and unscrewing bulb from its socket.
The tuning in of distant stations depends on a number of factors, such as local conditions, season of the year, type of aerial used, and the power of the broadcasting station. Distant reception is usually best during the colder weather and after dark. When tuning for distant stations, the local-distance switch should be turned “up” to the “Distance” position, the volume control should be fairly well advanced, and the Tuning Dial Knob rotated quite slowly.
Owing to external conditions not yet fully understood, the daylight receiving range of all radio sets is considerably less than the range at night.
Reception of broadcasting from a distant station will occasionally be found to “fade” in intensity or gradually die out and then slowly return again to normal volume. The cause of this peculiar action is not yet fully understood; however, it is believed to be due to varying conditions in the transmission medium. It is suggested that when this condition is noticed, the listener temporarily select another program on which the fading does not exist, since it will probably occur on only a few stations.
There are various possible causes for the noises which are sometimes heard in connection with broadcast reception. Some of these noises are preventable, and others may be eliminated in the course of time.
An unpleasant howl may be caused by the detector tube (socket No. 3 in Model 55, or No. 4 in Model 6o). If this occurs, first make sure that the metal detector cap (furnished with set) is in place, and is not touching any adjacent part in the set. Then try interchanging this tube with that in the socket to the right of it. If this does not correct the trouble a replacement must be made.
Most of the noises heard as a “background” to broadcasting, especially when listening to distant stations (when the volume control is well advanced and the set is in a sensitive condition) are due to miniature electrical discharges in the atmosphere or the sparking of various electrical machinery and wiring. The latter type of disturbances are radiated from the wiring attached to the machinery, and picked up by your antenna and ground system. This can be readily proved by disconnecting the antenna and ground lead-in wires from the set, which will cause these noises to disappear.
A noise which is due to a poor connection or any trouble in the receiver or power supply, will continue with the antenna and ground disconnected. Should this condition be found to exist, follow instructions in paragraph