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Multi-band tank circuit antenna tuner. Dual differential input capacitor. Combination of large parallel tuned coil in parallel with smaller series tuned coil result in an equivalent parallel tuned circuit at any frequency from 80 thru 10 meters. In the case above, the large coil is tapped with a selector switch to extend its range down to 160 meters. Toroidal baluns provide balanced output (rarely used with this tuner). Input has a Breune SWR bridge. Separate forward and reflected power meters. On back side is an antenna selector switch for six different antenna positions. This has been a great tuner over the years. Professional circuit analysis software reveals a high degree of harmonic suppression with this arrangement.
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