8
I n p u t G a i n C o n t r o l s
There are two Input Gain Controls located on the end panel under the RCA
input jacks. These are not volume controls! These controls match the
output signal voltage of the source unit to the amplifier inputs.
By turning the controls clockwise (to the right), the inputs of the amplifier
become more sensitive and will allow a weak signal of approximately 1/2
volt to drive the amplifier to full power. At the same time, while an amplifier
with its level controls at maximum is able to drive a weak signal, it also picks
up and amplifies any noises lurking in the background, such as a brake light
pop, alternator whine, or ignition tick.
Increasing the signal voltage to the amplifier by using a high output source
unit, or a TUBE DRIVER LD-3, will increase the signal to noise ratio . By
turning the level controls counterclockwise (to the left), the amp inputs will
be less sensitive. The amp will reproduce music at full power while making
any noise floor insignificant. Your T UBEDR I V E R accepts signal levels of
up to 12 volts RMS.
S e t t i n g I n p u t G a i n
1. Set the Input Gain Controls to just above the lowest setting.
2. Turn the master volume on the source unit or pre-amp to almost full
volume.
3. With music playing, slowly increase each Input Gain Control until you
hear distortion. Turn down each Gain Control until the distortion stops.
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