12-07-2010, 09:23 PM
Not all consumer radios had dials that tracked perfectly. My 18B cathedral has a lot of markings on its dial, done by the original owner no doubt as Philco encouraged that in the early 1930s. WSM is marked at 64 on its dial. In 1933, as now, WSM was/is on 650 kc. When I restored and aligned this 18B, and adjusting the low frequency padder by "rocking" as outlined above, the low end of the dial is 10 kc off on the low side. Judging by these markings, it was that way when it left the factory. Since it has these markings on the dial, I left it that way.
Again, for best performance, it is best to adjust the low end so that the oscillator tracks accurately with the set's IF frequency. This is why it is more important to reach a peak on the low end, whether or not it throws off the low end tracking.
Again, for best performance, it is best to adjust the low end so that the oscillator tracks accurately with the set's IF frequency. This is why it is more important to reach a peak on the low end, whether or not it throws off the low end tracking.
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Ron Ramirez
Ferdinand IN
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