[NJARC] Stromberg Carlson tuning

[Nick Senker]

I am working on a Stromberg Carlson SR405 Hi-Fi AM/FM receiver which has an interesting tuning arrangement.  The AM uses a standard variable tuning capacitor.  This is connected to a gear and rod that move slugs in a transformer coil for the FM tuning.  The tuning works well for both AM and FM.  I believe this is called 'reactance tuning'?  As I am not an engineer, I would be interested in the pros and cons of 'reactance tuning'  Stromberg Carlson seems to be one of the few companies to use this although as I recall it used to be common in auto radios.  Would appreciate any comments from our members.  Nick Senker