TUBE EQ
Vacuum Tube Filter
Congratulations on your purchase of the Tube EQ vacuum tube filter. This uniquely
powerful tool is designed to enhance your music and expand the range of your
existing equipment. The Tube EQ is used differently than most standard equalizer or
tone control circuits, so please take a few minutes to familiarize yourself with the
Tube EQ's controls and how they work.
Your unit comes equipped with a 12 Volt/1 Amp AC external power adapter.
Use
only the power adapter supplied
, and make sure it is appropriate to your location
(USA, Europe, Japan, Australia). Using the wrong adapter can cause damage to the
unit or to you! Use of the wrong adapter will void the warranty.
The Tube EQ consists of two (2) filter sections that are summed together to create
an endless range of tonal possibilities. A passive "shelving" type "tone stack" with
Bass and Treble controls is combined with an active "parametric" bandpass filter with
its own gain, frequency and "Q" controls. Turning the BASS, TREBLE or BANDPASS
GAIN controls clockwise (CW), increases the level of each respective range. Keeping
each control at maximum counter-clockwise (CCW), or OFF, attenuates the input
signal by about 20 dBs.
TREBLE –
Determines the high frequency content of the filter.
BASS –
Determines the low frequency content of the filter.
FREQUENCY –
Determines the center frequency of the bandpass filter.
BANDPASS GAIN –
Determines the level of the bandpass filter.
Q –
Determines the width and resonance of the bandpass filter.
In addition to the input and output jacks at the front of the unit, there is also an
insert for an expression pedal. When this is used, the pedal will control the frequency
center of the bandpass filter only. This produces nice "wah" like effects and more. It
is also recommended that you try this first without using the BASS or TREBLE
controls at all. Leave them OFF.
The FREQUENCY control must be set to the maximum clockwise setting to get the full
range of the pedal. The FREQUENCY control can then be used as a range trim with
the expression pedal to make a fine adjustment to the range of the pedal sweep.
Turning the FREQUENCY knob counter-clockwise with the pedal plugged in has the