From Pete Millett...
Just wanted to post a short note about the coupling heard when an unused input is selected on the Butte...
The Butte has a high input impedance. When the input selector is set to an unused input, there is nothing connected to the amp except PCB traces. Because of the high input impedance (I design in high input impedance intentionally, to decrease the distortion of the source driving the amp), the tiny capacitance across the input switch allows some signal to leak from the other (driven) input.
If two sources are connected, this doesn't happen, as the source impedance is orders of magnitudes lower than the impedance of the leakage across the switch. In other words, if you connect two sources and mute one of them (or connect a shorting jumper across the unused input), you will not hear any leakage.
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Just wanted to post a short note about the coupling heard when an unused input is selected on the Butte...
The Butte has a high input impedance. When the input selector is set to an unused input, there is nothing connected to the amp except PCB traces. Because of the high input impedance (I design in high input impedance intentionally, to decrease the distortion of the source driving the amp), the tiny capacitance across the input switch allows some signal to leak from the other (driven) input.
If two sources are connected, this doesn't happen, as the source impedance is orders of magnitudes lower than the impedance of the leakage across the switch. In other words, if you connect two sources and mute one of them (or connect a shorting jumper across the unused input), you will not hear any leakage.