GROUND RADIO bulletin ho. 31 - January 11, 1951 COMMS. DEPT. L.A.D.
TUBE SOCKETS
There are cases of RK-65 tubes (and others) being considered defective due to open filaments when actually the real trouble is poor contact in the tube socket. This socket trouble is not always apparent because when the tube replacement is made the "handling” of the tube in and out of the socket restores contact.
When a tube is found unlighted the natural reaction is an open filament. To change * the tube the main power switch on the transmitter is opened which turns off all filaments. Thus when the tube is moved in the socket its filament might again light except for lack of power. 'Whenever this trouble is encountered the suspected open filament in the tube should be confirmed, by moving the tube around in the socket while filament voltage is present, by checking the tube in another transmitter, or with an ohmmeter placed across its filament terminals. Following this procedure may result in obtaining greater service from the more expensive type tubes. Where a replacement tube socket for the RK-65 is needed, the PAA Part Number is 9054-7606.
EQUIPMENT OVERHAULS
When making regular overhauls to ground radio equipment, most stations send in an Equipment Repair Report slip from the book assigned to the piece of equipment being overhauled. This is fine, and a great help in keeping the overhaul records straight. One more entry on the slip will also help. Please add overhauled per CD- (and put tne form number of tne overhaul check sheet). In this way it can be determined that a regular standard overhaul has been completed.
Sample copies of these overhaul sheets are in the manual. If they are needed they can be ordered by CD number.
SELF WINDING CLOCKS
The batteries in self-winding clocks should be examined periodically - at least every three months. Aside from their internal condition (ability to supply winding motor power), the batteries in some clocks have been found to be leaking, causing corrosion around their mounting straps and possibly endangering the clock mechanism. Batteries will continue to supply power in some cases, even with the case badly corroded. Even if the battery is okay electrically, if it is corroding outside the case, the battery should be replaced.
HAVE YOU REVIEWED THE BACK COPIES OF THE FAULT SHAKER RECENTLY?