Moveable Coils

Radio Record, Volume III, Issue 11, 27 September 1929, Page 10

Moveable Coils

Liable to be Noisy READERS who are in the habit of using six-pin coils and interchanging them frequently so as to tune in the lower and upper waye-bands, should make a point of examining the pins from time to time, as imperfect contacts are sometimes caused by the two halves of the split pins being pinched too close together. It is not always realised that a faulty contact may bring about a considerable reduction of signal strength without indicating its presence by a complete "dis." This is particularly the case in sockets connected to grid circuits. To remedy matters remove the coil and open up the pins by inserting a thin knife in the cut. If the coils are used in exposed places without qa box or cabinet, the base should be kept well free from dust.