09-03-2011, 06:59 AM
The coils in the larger 1936 Philco models seem to be exceptionally well built, and appear to have avoided the use of the nitrocellulose insulation that breaks down with age, causing the winding directly above it (and sometimes, the winding below it) to corrode and fail.
In all of the years I've been working on radios, I've only had to replace one of those coils. It was either an antenna or an RF coil in a model 620 or 630.
I'm not saying they will last indefinitely - who knows how long they will last - but they do not seem to suffer from the issues that the older coils do. As an example, it should be considered standard operating procedure to count on having to rewind both the antenna and oscillator coils in a Philco 60.
In all of the years I've been working on radios, I've only had to replace one of those coils. It was either an antenna or an RF coil in a model 620 or 630.
I'm not saying they will last indefinitely - who knows how long they will last - but they do not seem to suffer from the issues that the older coils do. As an example, it should be considered standard operating procedure to count on having to rewind both the antenna and oscillator coils in a Philco 60.
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Ron Ramirez
Ferdinand IN
