Yes the input impedance of a good tube is much higher than the typical 1 Megohm resistor referencing it to ground. That's a million ohms so not much of your gu

Yes the input impedance of a good tube is much higher than the typical 1 Megohm resistor referencing it to ground. That's a million ohms so not much of your guitar signal is wasted passing through it to ground. The input impedance of the tube reacts dynamically according to the signal coming in, and the often dynamic behavior of whatever is plugged directly into it. When that's just your guitar without any pedals or anything, that can be the most dynamic from a touch-sensitive point of view.