How bothersome is it really? As far as sound coming out with the volume control down, if it is just a bit, then the control is probably inexpensive and does not track well. Either replace it with a more expensive one, or live with it, it will do no harm. The question of hum with the tuner off merits a little more research. Does it do the same when the CD player is plugged into this input? How much hum do you hear, what is your amp and how sensitive are your speakers? A bit of hum in a simple tube preamp can be pretty hard to excorcize. Start by moving the preamp to a different position. Changing the lay of the power cords, etc. Talk with other owners of the design and the manufacturer.
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