12-10-2013, 06:23 PM
He appears to be referring to adjustable capacitor (4) on the schematic.
That capacitor serves two functions. In normal use, it is a fine tuning control that helps you tune in stations with the greatest volume.
On very strong local stations, it is also designed to be turned until it clicks, at which point the volume drops appreciably by shorting the grid of the first RF tube to ground, reducing the set's gain considerably. So it is not only a fine tuning control, but also a crude local-distance switch.
That capacitor serves two functions. In normal use, it is a fine tuning control that helps you tune in stations with the greatest volume.
On very strong local stations, it is also designed to be turned until it clicks, at which point the volume drops appreciably by shorting the grid of the first RF tube to ground, reducing the set's gain considerably. So it is not only a fine tuning control, but also a crude local-distance switch.
--
Ron Ramirez
Ferdinand IN
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