INSTALLATION
P
OWERING THE
SANSAMP PSA-1
The SansAmp PSA-1 is powered by potentially hazardous voltage. Therefore, observe the fol-
lowing safety precautions.
WARNING: To avoid the risk of shock or fire, do not expose this unit to moisture. Do not
remove the chassis from its cabinet, or remove metal covers from chassis parts. Removing the
chassis from its cabinet exposes extremely dangerous high voltages. There are no user-service-
able parts inside. Hazardous voltages are present inside the chassis. Refer all servicing to quali-
fied personnel.
CAUTION: Never modify the AC power cord. If the original AC power cord becomes dam-
aged, refer your SansAmp PSA-1 for servicing.
WARNING: Attempting to repair this unit is not recommended and will void its warranty.
NOTE: In the U.S. and Canada, servicing of SansAmp PSA-1 is performed at factory only.
In other countries, please refer repairs to the local Tech 21 authorized distributor.
FRONT PANEL
The SansAmp PSA-1 gives you access to specific tone-shaping characteristics within the tube
amplifier sound spectrum. Controls of this nature are traditionally inaccessible on stock amps,
and adjustments like these can ordinarily be achieved only by permanent professional modifi-
cation.
Tonality, for instance, can be adjusted in a variety of ways. The individual Character
Controls, labeled Buzz, Punch, Crunch, and Drive, offer different results than the post EQ
section (the controls labeled Low and High).
The gain structure can be adjusted via the Pre-Amp control, which results in a different kind
of overdrive than the Drive control. Additionally, Buzz, Punch, and Crunch each affect the
gain structure within specific frequency bands.
As you experiment and become familiar with the controls’ interrelationships, you’ll be able to
customize your own sounds and store them in the SansAmp PSA-1’s memory.
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Because the SansAmp PSA-1 is fully programmable, everything you do is monitored by the
SansAmp PSA-1’s internal computer. Whenever you turn a knob from the setting stored in
memory, one of the two dots in the upper left corners of the LED
numerical display blinks.
This feature is useful when you want to know the position of each
knob’s setting in the memory. Here’s how to use it::
Assume that the preset point for a particular knob is 12 o’clock.
When you turn that knob, it “unlocks.” One of the two dots
above the digits in the LED numerical display will blink. The
arrows above the LED display tell you which direction
you need to turn the knob to find the preset point. The
up arrow tells you to increase the setting; the down arrow
tells you to decrease.
If you are far below the preset point, the left dot blinks
slowly. Follow the direction of the arrow (up) and
increase the setting. As you get closer to the preset point,
the dot blinks faster. If you turn the knob past the preset point, the right dot will first blink
fast and then slow as you turn farther clockwise away from the preset point. When you reach
the preset point, both dots stop blinking and go dark.
INPUT JACK
This 1/4" Input features an impedance buffer so that the tone from a guitar’s or bass’ pickups, or
the signal from other instruments, reaches the SansAmp PSA-1 without degradation. A second
input jack is located on the rear panel. Note: plugging into the front-panel Input jack overrides
and disconnects the rear-panel jack. This lets you set up your SansAmp PSA-1 as a permanent
part of a rack or patch-bay setup, with its usual input source plugged into the rear-panel jack.
Then, if you want to plug straight into the SansAmp PSA-1, bypassing other parts of the system,
you can use the SansAmp PSA-1’s front Input.
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