| 摘要 |
This invention relates to an all channel tuner with means for tuning a variable capacitance element, said means interlocking with an operating shaft of a power source changeover switch. The power source changeover switch changes the polarity of a switching element for short-circuiting part of a coil for the tuning of a VHF tuner. A variable resistor selection switch adjusts a reverse bias to the variable capacitance element. The selection of a desired frequency band and the selection of the variable resistors for a desired channel are simultaneously carried out by the rotation of a channel shaft. A variable reactance element is used as the tuning element. A driver engages the shaft of one of the variable resistors by the pressure in the axial direction of the adjusting shaft. The adjusting shaft is coaxial with the channel shaft.
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