Electro-Harmonix TUBE EQ User manual

- FCC COMPLIANCE -
This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions: 1) This device may not cause harmful interference, and 2)
this device must accept any interference received, including interference that may
cause undesired operation. If the device is not installed and used in accordance with
the instructions, it may cause harmful interference to radio communications and void
the user's authority to guarantee the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Modifications not expressly approved by the manufacturer could void the user's
authority to operate the equipment under FCC rules.
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
onl 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 effect of both
reducing the range and lowering the frequency center of the bandpass filter. If the
FREQUENCY knob is turned all the way counter-clockwise, the pedal will not do anything.
In addition to an expression pedal, a DC control voltage CV) can be inserted to allow
remote sweeping of the frequency control. The range of this input is 0 - 5.0VDC.
Make sure all controls are set at minimum fully CCW). Connect your instrument to the
input jack and your amp to the output jack. The unit's power LED should be lit.
Set the BASS and TREBLE controls to halfway between minimum and maximum. Test your
instrument's sound in both bypass and effect. You should hear a big difference in the
frequency extremes.
Turn OFF both the BASS and TREBLE controls fully CCW).
Set the FREQUENCY control to halfway between minimum and maximum. Set the Q control
to halfway between minimum and maximum. Set the BANDPASS GAIN control to halfway
between minimum and maximum.
Test your instrument in both bypass and effect. You should hear a big difference in the
midrange. Turn the FREQUENCY knob back and forth to get a feel for how much range the
bandpass filter has. Turn the Q knob OFF and repeat the last step. Carefully turn the Q
control ¾ CW) the way up. You will hear the resonance sharply increase. Turning the Q
control all the way up may and probably will cause oscillation. In some cases, this will find
excellent uses in electronic music. For guitar and bass, this will most likely provide more
than needed. Get a sense of the useful range for your instrument.
Try combining the BASS and TREBLE with different mixes of the BANDPASS
GAIN/FREQUENCY/Q to get subtle or extreme tone changes to the bypassed sound. With a
little practice, many different kinds of shaping can be simply accomplished. It is often the
case that a gentle use of the BANDPASS GAIN knob gives the best results when mixed with
the BASS and TREBLE knobs.
Remember to turn the BASS and TREBLE OFF when using an expression pedal or control
voltage CV).
As always, experiment to achieve your own unique sounds. When used properly, the TUBE
EQ will provide a lifetime of musical pleasure!
- WARRANTY INFORMATION -
Please register online at http://www.ehx.com/product-registration or complete and
return the enclosed warranty card within 10 days of purchase. Electro-Harmonix will
repair or replace, at its discretion, a product that fails to operate due to defects in
materials or workmanship for a period of one year from date of purchase. This
applies only to original purchasers who have bought their product from an authorized
Electro-Harmonix retailer. Repaired or replaced units will then be warranted for the
unexpired portion of the original warranty term.
If you should need to return your unit for service within the warranty period, please
contact the appropriate office listed below. Customers outside the regions listed
below, please contact EHX Customer Service for information on warranty repairs at
[email protected] or [phone]. USA and Canadian customers: please obtain a
Return Authorization Number RA#) from EHX Customer Service before returning
your product. Include with your returned unit: a written description of the problem
as well as your name, address, telephone number, e-mail address, and RA#; and a
copy of your receipt clearly showing the purchase date.
United States & Canada
EHX CUSTOMER SERVICE
ELECTRO-HARMONIX
c/o NEW SENSOR CORP.
55-01 2ND STREET
LONG ISLAND CITY, NY 11101
Tel: [phone]
Email: [email protected]
Europe
JOHN WILLIAMS
ELECTRO-HARMONIX UK
13 CWMDONKIN TERRACE
SWANSEA SA2 0RQ
UNITED KINGDOM
Tel: [phone]
Email: [e-mail]
This warranty gives a purchaser specific legal rights. A purchaser may have even
greater rights depending upon the laws of the jurisdiction within which the product
was purchased.
To hear demos on all EHX pedals visit us on the web at www.ehx.com
Email us at [e-mail]