Duncan KTG-1 Tube Owner's Manual

KTG-1 Tube

Guitar Preamp

Owners Manual

Caution

To prevent electrical shock, do not operate this unit in wet or moist areas.
There are no user - serviceable parts inside. (see, "Maintenance" and "Tube Chart" sections for

user maintenance procedures.)

Specifications

1 rack space, 2 channel, all vacuum tube
preamplifier
Input impedance - 1 meg - All controls up Ch. I Hum and noise - -87.5 dB

Output impedance -5K (note: 5K output
impedance is achieved using a vacuum tube in
cathode follower configuration, there are no
solid state devices used in the signal path)

Max output before clip -25V RMS Made in America
Boost #1 - 6.0 dB @ I Khz
Boost #2 - 8.0 dB @ 1Khz
Crunch - 8.0 dB @ 6Khz

Noise (referred to full output, 20 - 20Khz)

Ch.2 (high gain), Hum and noise - -70dB

- Master volumes down. Output control up.
Output stage (#5 and #6 only)
Hum and noise- -11OdB
60Hz- - 134 dB
120Hz- - 131 dB

King Tone Generator

Congratulations on your purchase of the Seymour Duncan Research KTG-1™ Tube Guitar
Preamp. "KTG" stands for "King Tone Generator” ™ Each product in the KTG Series has been
designed and built to generate great guitar sound, now and for years to come. Read this manual
carefully to familiarize yourself with the features and operation of the KTG-1. Meanwhile here are
some set - ups to try out.

Adds 5 db boost to both channels.

Front Panel

The KTG- I Tube guitar preamp is designed to operate at the beginning of a rack system. It will
generate a wide range of guitar sounds, from super clean to radical overdrive. The above front
panel shows a basic set - up of clean and distorted rhythm and lead sounds.

Channel and Tone Settings

For clean rhythm, use Channel One with no boost engaged. Add "Pull Boost" for clean solos, and
clean rhythm with a touch of grit. Use Channel Two with no boost engaged for distorted rhythm or
lead. Add Channel Two” Pull Boost" for fatter, more saturated rhythm or lead tone. Add Channel
Two "Crunch Boost" for super high-gain solo tone. By experimenting, you can discover which
combinations will work best for the sounds you need. See the settings on page 1.

Channel Switching and Gain Boost Functions

Channel Switching and Gain Boost functions can be accessed 3 ways;

1. Manually from the front panel of the KTG- 1

2. Via the optional Four Function Programmable Footswitch

3. By using the optional Adapter Cable with any programmable
MIDI switching device (see page 6)
Note: Any standard 1/4" phone SPST Footswitch will change channels, but can't activate
the Gain Boost function.

Adds 8 db boost to Channel 2 Adds 8 db at 6 khz to Channel 2

Using the Gain Boost functions of the KTG- I will provide many distinct tone and gain settings.
The Pull Boost on Channel One adds 6 db boost to both channels. The Pull Boost on Channel
Two adds 8 db to Channel Two only. The Crunch adds 8 db boost centered at 6KHz to Channel
Two only.

Using Effects

Any number of effects may be used between the KTG- I and the power amp. When not using
effects, connect the parallel outputs on the back of the KTG- I to both channels of a stereo power
amp. This produces a mono signal. When using stereo effects, connect either of the parallel
outputs of the KTG- I to the input of the first effect in the chain. Come out of both outputs of the
last effect in the chain, to both input channels of a stereo power amplifier.

Signal Chain/ Patching Diagrams

Important! With Use with Use with

use the 5K ohm any optional

correct Fuse output standard Programmable

Only impedance 1/4" phone Footswitch to

SPST switch

For IOOV Footswitch channels

and 120V - use to switch and

200MA/250V channels. Boost/Crunch

SLO-BLO Fuse controls while

you play

For 220V

and 240V -use

100MA/250V IMPORTANT: this

SLO - BLO Fuse is not MIDI

Using the KTG-1 with MIDI Equipment

With the addition of a Duncan adapter cable (Model # 128017) and a programmable MIDI
switching device such as the Scholz MIDI octopus, you can place functions of the KTG-1 under
MIDI control. See the diagram below.

How to use with a Duncan Programmable Footswitch

The KTG - 1 Preamp was designed to work equally well for musicians with and without full MIDI
controlled racks. If you aren't set up for MIDI, then the optional Programmable Footswitch will
give you quick and easy stage access to 4 sounds.

To use, make sure the preamp is in green (clean) channel and all boosts and crunch are off
(pushed in), then simply plug the Programmable Footswitch into the "4 Function" DIN jack on the
back of your preamp.

Dip switches inside the footswitch allow you to create the 4 sounds most useful to you. The
footswitch comes pre - programmed for the following:
#1 Button - Green Channel = "Fendery" clean with good presence & depth.
#2 Button - Red Channel = Tight, punchy, dirty rhythm - Fat bluesy lead.
#3 Button - Red Channel with Boost 2 = Hi Gain lead, smooth, rich in harmonics and lots of
sustain.
#4 Button - Red Channel with Boost 1, Boost 2 and Crunch Super gain over the top lead with bite
and full - tilt distortion. Refer to page 2 for charts showing control settings.

Maintenance

Handle the KTG- I with care, preferably mounted in a good quality rack, and it will provide years
of trouble free service.

Most maintenance procedures will involve the tubes. Refer any other necessary work or
adjustments to a qualified technician. There are no user servicable parts inside. If your KTG- I
should require service, contact us at the factory [phone] or your Seymour Duncan
Research Dealer for the name of the Authorized Service Center nearest you.

The 12AX7 tubes should last 1 1/2 years, depending on use. Symptoms which indicate failing
tubes include:

q any intermittent noise (sputtering, ringing,etc.,)
q excessive white noise or hiss.
q inability to get a clean sound from the clean channel, even at low volumes.

Trouble Shooting

The following chart should help isolate some common problems you may encounter with your
pre-amp. Some are obvious problems you can solve yourself.

1. No output:

q Check power indicator. Switch on & AC plugged in?
q Check fuse. Replace with a 200 MA/250V SLO-BLO fuse
q Verify source voltage with something you know works.
q Check to make sure volume controls are up.
q Output jacks not connected, or faulty output cable.
q Defective speaker, or speaker connection.
q Guitar turned up?

2. Distortion from clean channel or deterioration of tone or quality in distortion channel.

q Check 12AX7 tubes.

3. Pre-amp will not switch channels:

q Check footswitch - is it overriding the front panel selector?

Check front panel Channel Switch - it must be in Channel I to enable the Programmable
Footswitch to switch channels, please refer to section "How to use with a Duncan Programmable
Footswitch.

If manual channel switching control, or internal switching circuit is defective, refer to authorized
service center.

Notes

Seymour Duncan

5427 Hollister Avenue

Santa Barbara, CA 93111

Tel: [phone] Fax: [phone]

www.seymourduncan.com