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Operating Instructions 250ML/RL/212SCL
The Basics
Your new G-K stereo guitar amplifier represents the very latest
advances technology has to offer. It was designed to provide you with
any sound you need and more. With the stereo effects. (Echo & Chorus),
the pre-set gain switches, the channel switching and companding on the
clean channel there are over 20 different sounds available.
The active four band equalizer (shared by both channels) works
extremely well in both the clean and overdriven modes. You can actu-
ally EQ your overdriven sound, a rare feature in its own right. This
amplifier has many other features, all described here. A careful
examination of this manual will help you to get the most from them.
Input Jack
The input jack is a standard 1/4'' jack capable of handling a wide variety of
signal levels up to 2.0v RMS.
Channel Switching
You can switch from channel A (clean) to channel B (overdrive) in two
ways. One is by using the A/B button - on the front panel, the other
being the footswitch. (described later)
Channel A
Channel A offers a new fully produced clean sound for rhythm work or
for clean lead applications. This channel can be used for anything from
cool jazz to smokin' blues.
Compander on/off
The compander on the clean channel is a pre-set effect that levels out the
signal. It does this by cutting the initial signal and boosting the signal
as it decays; resulting in a clean sustain for a "bluesy" sound.
Gain on/off
The gain switch is also pre-set. With the switch on, the signal is given
a boost which puts an edge on the sound without totally overdriving it.
This effect used in conjunction with the compander sounds great for
single note soloing and chord melodies.
Volume
This knob controls the total output for the clean channel A from off to
full power.
*The pre-set effects have been factory adjusted to common settings.
These can be internally adjusted by a technician at Owner's expense.
Channel B
Channel B represents 15 years of research and development for a warm
solid state distortion. This channel, with no effects or gain on is the
backbone for the supreme rock sound.
Gain on/off
This switch is also a pre-set control. It gives the option of two gain
levels, (as with channel A). With the gain in on channel B, the signal
is boosted to a very high level producing on infinite sustain.
Used with care, this effect can offer any squawk, scream or crunch
needed for contemporary high-energy rock & roll.
Volume
This knob controls the total output for the overdrive channel B
from off to full power.
4 Band EQ
1. The first knob from the left is an active treble control operating at 8.0
kilohertz. It adds high-end and brightness to your sound.
2. The second knob is an active high mid-range control operating at 2.0
kilohertz. This control adds punch to your sound.
3. The third knob is an active low mid-range control operating at
500hertz. This control adds to the meat or body of your sound.
4. The last EQ knob is an active bass control operating at 120 hertz.
This controls the bottom end of your sound. The Boom!
Stereo Effects
The next two switches make up the stereo effects section. The first one
being the pre-set stereo Echo. This effect acts like an electronic reverb
but using an IC chip as opposed to a spring unit to produce a full stereo
reverberation.
The second switch is a pre-set stereo Chorus effect. This effect, also
using a high technology IC chip, gives a full stereo enhancement of your
sound in total stereo voicing.
Footswitch
The footswitch jack is a standard 1/4'' stereo jack. With the footswitch
you can change channel (from A to B ) and turn the stereo effects on and
off. (see accessories)
Phones
The phones jack is also a standard 1/4'' stereo jack. It delivers a bal-
anced stereo signal for use with high impedance head phones, (600 ohm
or greater). Plugging into the phones jack disconnects all speakers.
Power Switch
The power switch on the 250ML/212SCL is located on the rear panel
above the fuse holder. On the 250RL the switch is on the front panel
lower right.
Power Cord
The power cord is detachable and plugs into a socket located on the rear
panel. If a replacement cord is used or needed it should be UL rated at
10amp, 125v; or if using 240v, the cord should be UL rated at 5amp,
240v.
Direct Out
This is an electronically balanced mono output that will put 500mv
RMS into a 600 ohm load. It comes on after the effects loop and is
located on the rear panel. This output shuts off when the head phone
jack is used.
Effect Loop
The effects loop, located on the rear panel is provided for the insertion
of effects. It is post EQ and pre internal effects. Using standard guitar
cords, connect the effects input to the send; the effects output to the
return. The level is 5v for full power out.