Abstract: A variable tuning resistor has a threaded shaft which moves a slider along a linear resistance element. A flexible ribbon is connected at one end to the slider to be moved thereby. A guide member through which the ribbon is guidingly slidable is oriented perpendicular to the shaft extending upwards. The guide member is formed with a window through which the ribbon is visible. The ribbon is formed with a marking such as a slot obliquely along the length thereof in such a manner that as the ribbon is moved the part of the marking visible through the window appears to move from one side of the window toward the other thus serving as a tuning indication. A rotary band switch is connected to the tuning resistor with the shaft coaxially extending therethrough.