Steve Deckert
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The "fixed" jacks bypass the volume control in so much as the volume control becomes a variable ground shunt. All the way up, the input impedance of the amplifier is 100K. If you run it anything less than all the way up the input impedance will drop until the source can no longer drive it. It is intended to be used with the volume all the way up.
The variable jacks work as you would expect, with a fixed input impedance of 100K and logarithmic control over the gain. AKA smooth even control over the volume.
The way to tell which jack you're on is simple. Turn the volume all the way down, turn on the amp, let it warm up a bit and then press play on your source and slowly begin to raise the volume. If it works as expected, you are on the variable jack. If the volume jumps up rapidly and almost instantly, you are on the fixed jack.
Hope that helps. :)
Steve
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