Model 37-690 Intermittent Noise
Referring
to Service Bulletin No. 228, it is recommended that the flexible resistors
Nos. 53, 148 and 151
be checked and replacement made of the one found to be at fault. These resistors
are of the wire-wound type. Some have been found where the electrical connections
at the pigtail leads had a tendency to loosen or stretch, causing noise
in reception, especially when the receiver is operated at extreme bass response.
From the Philco Serviceman - June, 1937.
