Intro
Thank you for purchasing the Science Sister guitar amplifier! This manual goes over the
different features of the amplifier, maintenance, tube, and warranty information as well as
some general tube amp info.
Front Panel
Input jack: ¼” for your guitar cable.
Channel switch (Normal/Overdrive): Switches between Normal and Overdrive channels.
Overdrive channel includes: Overdrive Gain, rotary Depth control, and Overdrive Loudness.
Normal Channel includes: Normal Gain, and Normal Loudness. Treble, Middle, Bass, Presence,
and Resonance controls are shared and and active for both channels. The Channel switch is
over-ridden with the footswitch is plugged into the rear panel.
Overdrive Gain: Adjusts overall gain for the Overdrive channel. The more the control is
turned up, the more overdrive will be produced.
Depth: 6-way rotary switch that adjusts the overall low end depth in the preamp for the
Overdrive channel only. The most counter-clockwise setting provides the least depth, while
the most clockwise produces the deepest tone. This control is highly interactive with the Gain,
Bass, and Resonance controls, and can produce a huge array of tonal variations and break up
characteristics. Experimentation is key!
Normal Gain: Adjusts the overall gain of the Normal channel. Turning the gain control up will
result in subtle to a crunchy driven tone depending on the output of the pickups in your guitar.
Bass: Adds bass frequencies to both channels when turned clock-wise.
Middle: Adds midrange frequencies to both channels when turned clock-wise.
Treble: Adds treble frequencies to both channels when turned clock-wise.
Overdrive Loudness: Adjusts the overall volume of the Overdrive channel. Can be used to
balance volume with the Normal channel.
Normal Loudness: Adjusts the overall volume of the Normal channel. Can be used to
balance volume with the Overdrive channel.
Tip: For the cleanest tone possible, set the Normal
channel Loudness maximum, and use the Normal gain to adjust the overall volume level. For the
most overdriven sound possible from the Normal channel, set the Normal gain to maximum and
bring up the Normal Loudness to the desired
level.
Presence: Adds sizzle, bite, and... “presence” to the tone when turned clock-wise, or cuts high
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Summary of Contents for Sister
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