Tube Amp - Hammond XK-3 Owner's Manual

The TUBE (= Vacuum Tube) AMP produces a unique "Tube Feeling" sound.
By changing the amount of the Drive, various Tube Sound is obtained, from the
unclipped clean to the hard-distorted fuzzy, raspy Overdrive sound.
[TUBE AMP] BUTTON
This is for determining whether or not to go through the Tube Amp circuit.
To get this effect, touch the button and and the LED will light.
NOTE: You can see the tube through the ventilation hole on the back.
[TUBE OVERDRIVE] KNOB
This is for adjusting the distortion value of the Tube Amp circuit.
It does not clip, if turned to the left all the way, but the tone quality is slightly different
from when the [TUBE AMP] button is OFF, because it passes through the Tube Amp
circuitry.
As you turn it to the right, the distortion value increases, and the color of the LED of the
[TUBE AMP] button changes from green to red, in accordance with the amount of
distortion.
NOTE: You can fine-set the distortion degree. (P. 71)

TUBE AMP

TUBE AMP CIRCUIT
Tubes are rarely used in modern electric
apparatuses but because semi-conduc-
tors are better characteristics and
because tubes are inferior in many
aspects.
However, in some areas, tubes are again
popular because of their specific charac-
teristics, which are produced only by
tubes. People are still searching for the
sound simulating that of tubes for
effectors.
In this keyboard, a real Tube circuit is
used.
Setting Up
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