Kustom IV User manual

STEAM POWERED RADIO.COM
LEAD
AMPLIFIER
P/ N
006-0075-00

STEAM POWERED RADIO.COM
KUSTOM WARRANTY
All
Kustom amplifiers, power units, mixers, and
their
associated components and parts, except as specified below, are
guaranteed, by Kustom Electronics, Inc., to
the
original purchaser to be free of defects
in
material
or
workmanship for a
period of five
(5)
years from
the
date of purchase.
-and-
All
Kustom speaker cabinets and their associated components and parts, except as specified below, are guaranteed,
by
Kustom Electronics, Inc., to
the
original purchaser tobe free of any defects in materials and workmanship for a period of one
(1
)
year
from
the
date
of purchase.
-provided -
(1) The original purchaser applies for a Kustom Warranty Card for
the
guaranteed product(s) within
10
days of
the
date
of purchase; and,
(2)
Within
the
applicable period of this guarantee,
the
original purchaser delivers,
at
his own expense,
the
defective
product(s) to
an
Authorized Kustom Dealer
or
Service Center for repair; or,
wtere
no
such dealer or service center
is
nearby, obtains
at
his own expense from Kustom Electronics, Inc., an "Authorization Number" to
return
merchandise and ships,
at
his own expense, the defective product(s) to Kustom Electronics Customer Service,
909
W. Cherry, Chanute, Kansas 66720. The repaired product(s) will be returned freight prepaid.
Kustom Electronics, Inc., will,
at
its option, repair or replace the defective part(s)
or
product(
s)
.
Excluded from coverage by this warranty
are
exterior surfaces and finishes, face panels, grill cloth, covers, knobs,
handles, casters and appearance items.
Any modification of the Kustom-manufactured product(s) such as
the
installation of substitute parts, rewiring
or
other
changes to
the
system without written authorization from Kustom Electronics, Inc., will automatically void this warranty.
Kustom Electronics, Inc., shall not be liable for any direct, special, incidental
or
consequential damages incurred
by
reason
of
a breach of
the
above provisions, except as expressly provided above.
The provisions of this warranty shall be covered by
the
local laws of
the
state
where
the
original purchaser shall
purchase products covered hereby, and shall be enforceable only to the extent, and
in
the manner, permitted under such
laws.
EXCEPT
AS
HEREI
EXPRESSLY
PROVIDED,
KUSTOM
ELECTRONICS,
I
C.,
MAKES
O
WARRA
TY,
EXPRESSED
OR
IMPLIED,
OF
MERCHANTABILITY,
FITNESS
FOR
A
PARTICULAR
PURPOSE,
OR
OTHERWISE.

STEAM POWERED RADIO.COM
HiZ/ LoZ Inputs
Channel II
KUSTOM
IV
LEAD
Drive
Reverb
On
-Off
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Volume
Bass
Middle Treble Master Volume

STEAM POWERED RADIO.COM
CONTROL OPERATION
CHANNEL I - LEAD
The Kustom IV Lead electric guitar amplifier is designed with one of the most flexible
electronic control systems available.
The Channel I preamplifier includes a non-linear device which
can be used to introduce a
deliberate, controlled distortion into the music. Located
in the circuit between the DRIVE and
VOLUME controls, the device receives its signal from the DRIVE circuit. In this manner, a high
DRIVE setting causes more distortion, independent
of the VOLUME setting. As a result, the
VOLUME setting to produce agiven output will depend
on the DRIVE control setting. DRIVE and
VOLUME controls should be used together to obtain a type of distortion similar to certain older
tube-type amplifiers.
To achieve this sound, adjust both controls so that the desired amount of
distortion
is achieved at the required volume level. With the DRIVE control adjustep maximum
counter-clockwise, distortion will
be at a minimum.
Distortion occurs
in the preamplifier and not in the output or final stages. Output distortion
will
be obtained only at high power and volume levels and has a distinctly different sound.

STEAM POWERED RADIO.COM
The BASS, MIDDLE, and TREBLE controls
are
of
the
"boost
and
cut"
configuration, and
exhibit a great
deal
of
control over their operating ranges. However, the type
of
guitar, strings,
and
playing style will have a noticeable effect
on
the tone control operation. The electric guitar
has
a frequency range of from approximately 74Hz (open
low
E)
to 1320Hz (12th fret high
E)
. The
dominant harmonic overtones occur
in
the frequency range
of
128Hz -5280Hz. The relationship
between the fundamental frequency and the harmonics determine the tonal quality of the
amplified sound. The tone control circuitry provides the musician with the means to control the
amplitude relationship between these frequencies.
The tone control circuits
are
configured very much like those
used
on
the older tube-type
amplifiers.
"T:his
arrangement
has
the advantage of unique boost and cut points and the
disadvantage that if
all
three tone controls
are
adjusted to minimum,
no
output signal will result.
The BRIGHT switch located
on
the TREBLE control (pull for "on")provides avery noticeable
increase
in
the extreme treble when the VOLUME control
is
advanced past position 5.
Tremolo
SPEED
and
DEPTH
controls
are
used to adjust the rate and effect
of
the tremolo
circuitry. The tremolo
SPEED
control adjusts the rate at which the tremolo circuits vary the
intensity
of
the amplified signal. The
SPEED
control will only function when the tremolo foot
switch
has
been depressed and the
DEPTH
control advanced to a
r.iominal
operating position
(5)
.
The tremolo
DEPTH
control adjusts the amount
of
effect the tremolo circuitry
has
on
the amplified
sound.
The R
EVER
B control adjusts the amount
of
artificial reverberation mixed with the input
signal. As the control
is
advanced
in
the clockwise direction, more
of
the reverberation effect
results. When the control
is
adjusted to minimum, the reverb spring will not crash or rumble when
the amplifier
is
moved or shaken.

STEAM POWERED RADIO.COM
CHANNEL II -
NORMAL
Channel
II
allows modified tone control action (for a bass guitar) and also allows proper
equalization for a standard electric guitar.
The electric guitar
has
a frequency range
of
from approximately
74Hz
(open low
El
to 1320Hz
(12th fret high El. The dominant harmonic overtones occur
in
the 128-5280Hz frequency range.
The relationship between the fundamental frequency and these harmonics determine the
tonal quality
of
the amplified sound. The tone control circuitry provides the musician with the
means to control the relationships between these frequencies.
The tone control circuits for the electric guitar 9
re
configured very much like those
used
on
the older tube-type amplifier. This arrangement
has
the advantage
of
unique boost and cut points
and
the disadvantage that if
all
controls
are
adjusted to minimum,
no
output signal results.
Channel
II
tone control circuits, like those used
in
Channel
I,
can only control the frequencies
within their operating range. However, control action for
an
electric guitar will
be
more apparent
under most operating conditions than for the electric bass, because
of
the ability of the guitar to
play chords.
The strumming
of
an
electric guitar produces
an
extremely complex signal which,
in
most
instances,
has
a fundamental frequency and at least one harmonic overtone
in
each
of
the tone
control operating ranges.

STEAM POWERED RADIO.COM
OPERATING CONTROLS
CHANNEL
I - LEAD
Drive Used
in
conjunction with the VOLUME control to produce a form of distortion
usually associated with tube-type amplifiers. With the DRIVE control adjusted to
minimum, a very clean sound results.
In
normal operation, the DRIVE and
VOLUME controls
are
adjusted to achieve the desired distortion at any volume level.
Volume Adjusts the loudness
of
the amplifier. Depending
on
the instrument used,
maximum amplifier output can
be
obtained at almost any control setting. Control
numbers
are
provided for
ease
in
readjusting the amplifier for a specified output
level.
Bass Adjusts the level of the
"low
end"
or
bass
frequencies. This control
is
of
the "boost
and
cut"
-type.
Middle This
"boost
and
cut"
-type control adjusts the level
of
the frequencies
in
relation to
the
bass
and middle frequencies. TREBLE
is
also the
"boost
and
cut"-type
control.
Treble Used to adjust high frequencies
in
relation to
bass
and middle frequencies. A
"boost
and
cut"
-type control.
Bright Located
on
the TREBLE control, the BRIGHT switch provi
des
an
additional degree
of
"bite"
or boost to the treble frequencies. Pull for
"on"

STEAM POWERED RADIO.COM
Speed Adjusts the rate at which the tremolo circuits vary the intensity
of
the amplified
signal. This control will only function when the trGmolo foot switch
has
been
depressed and the
DEPTH
control advanced to a nominal operating position
(approximately
5)
.
Depth Controls the amount of effect the tremolo circuitry
has
on
the amplified sound.
Tremolo circuitry varies the amplitude or strength
of
a signal
as
compared to a
vibrato circuit which actually alters the.physical pitch
of
a note.
Reverb Controls the amount
of
artificial reverberation mixed with the input signal. When
the control
is
at the minimum setting, the reverb spring will not
"crash"
when the
amplifier
is
moved or shaken.
CHANNEL
II -
NORMAL
Volume Same
as
Channel I VOLUME control.
Bass
Operates the
same
as
Channel I BASS, except that the boost and cut points
are
modified to resembl~ those
of
older tube-type amplifiers.
Middle
This "boost and
cut"
-type control affects frequencies
in
the middle
of
the electric
guitar range. Control action resembles that
of
a tube-type amplifier.
Treble A
"boost
and
cut"
-type control, its action also resembles that of a tube-type
amplifier and functions the same
as
Channel I TREBLE control.
Bright Operates the
same
as
Channel I BRIGHT control.

STEAM POWERED RADIO.COM
GENERAL CONTROLS
Master
Volume
Graphic
Equalizer
Controls the level from both preamplifier sections and allows the input amplifier to
be
completely over-driven to produce high-level distortion. This dual-unit control
is
located before and after the GRAPHIC EQUALIZER circuit (refer
to
the functional
block diagram), allowing the musician
to
maintain the same amount of preamplifier
overload distortion {if desired) at any loudness level. This control may
be
adjusted
for optimum signal-to-noise ratio when used
in
studio applications. To obtain the
optimum signal-to-noise ratio, adjust the preamplifier VOLUME and MASTER
VOLUME controls simultaneously.
The Kustom
IV
Lead
guitar amplifier features a 7-band {frequency) graphic equalizer
providing ±12dB
of
boost or cut at each frequency and allowing the musician
increased flexibility
of
tone control
in
a variety of playing environments. Before
experimenting with equalizer setting combinations, begin with
all
slides
in
the
"flat"
or center position.

STEAM POWERED RADIO.COM
TECHNICAL SPECIFICATIONS
Power Output
Preamplifier gain measured at 1.0KHz. Tone
controls maximum.
Signal-to-noise ratio.
Minimum input voltage required for rated output.
Tone controls adjusted for
12 o'clock position.
Bright switch in . Drive minimum . Volume
adjusted maximum.
Minimum input voltage required for rated output.
Tone controls adjusted for flat response at
1.0KHz. Volume adjusted maximum.
Power
output measured into two 3.0 ohm loads
at 1.0KHz. All tone controls maximum with
bright switch
in .
Frequency response measured
with tone con-
trols adjusted for flat response.
276
Watts RMS@ 1.0% THO
Channel I 30dB
Channel
II 39dB
Channel I Gain min. -77dB
Gain max. -58dB
Channel II Gain min. -81dB
Gain max. -50dB
Channel I 150mv RMS
Channel
II 22mv RMS
± 4.0dB 90Hz -13KHz

STEAM POWERED RADIO.COM
Nominal input impedance.
Line
output
at rated power.
Absolute minimum speaker load impedance.
AC accessory receptacle maximum load.
Channel I 50.0K ohms
Channel
II
220K ohms
0.700V RMS, ZL = 600 ohms
3.0 ohms per pair
of
jacks
8.0 ohms per jack
200 watts
TONE
CONTROL
RANGE
CHANNELi
Bass
Middle
Treble
CHANNEL II
Bass
Treble
Middle
± 8.0dB@ 40.0Hz
± 6.0dB @
300Hz
± 7.0dB@ 5KHz
± 7.0dB@ 40.0Hz
± 9.0dB@ 15.0KHz
± 6.0dB @
350.0Hz

STEAM POWERED RADIO.COM
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STEAM POWERED RADIO.COM
Printed in U.S.A.
KUSTOM
ELECTRONICS,
INC.
1010
WEST
CHESTNUT,
CHANUTE,
KANSAS
66720
6-2774
.
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REV.
UNIT
DATE
KUSTOM
IV