CR-1
LIMITED EDITION
GUITAR AMPLIFIER
USER’S GUIDE
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
What Were We Thinking?
The year was 1978 - the
first CR-1 was introduced
to fill the needs of musi-
cians looking for a great
sounding, indestructible
guitar amplifier that was
easy to use, affordable,
and loud.
Crate was “an original”
back then, and throughout
our history, originality and
innovation have gone
hand-in-hand. Over the
years we have won more
awards in the U.S.A. for
excellence and innovation
in amplifiers than any
other company in the
music industry. Our Shape
circuitry made finding
“your sound” as simple as
turning a single knob. Our
Sequential Cascading
Gains (SCG) and our
patented Flex Wave tech-
nology (now at Version 5)
produced solid state
amplifiers with remarkable
distortion and tone.
This limited edition CR-1 embodies a great mix of the old and the new. The
timeless wooden crate, built like a tank and uniquely different, has been given
the new soul of a pure tube preamp and the loudest, most toneful 5 watt Class
A tube power amp imaginable.
It was from this original amp design that the CRATE name was born. It sym-
bolizes our dedication to building products with durability, simplicity, and great
tonality in mind. Crank it up and check it out!
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
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The Front Panel:
1. Input: Connect your instrument here by
means of a shielded signal cable.
2. Gain: This control is only active when the
Gain On/Off switch (#3) is depressed. Use the
Gain control to boost the gain of the input sig-
nal. The maximum amount of additional gain
available is 30dB with this control rotated fully
clockwise.
3. Gain On/Off: This switch, when depressed,
activates the Gain control (#2).
4. Tone: Use this control to adjust the tonal
variations of the amplifier.
5. Volume: Use this control to adjust the output
level of the amplifier. At lower settings of the
Volume control the sound is usually brighter,
and the Tone control (#4) has more effect. Used
in conjunction with the Gain control (#2, switch
#3 depressed), this offers many sonic possibili-
ties. (See Suggested Settings, page 10.)
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
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The Front Panel (continued):
6. Line Out: Use this jack to send a line level
signal from the amplifier to a mixing board,
external amplifier or powered monitor, or a
recording device.
WARNING: Do not attempt to use
headphones in the Line Out jack!
7. Power: Use this switch to turn the amplifier
on (toggled down) and off (toggled up). The red
lamp above the paddle illuminates when the
amplifier is turned on.
The Rear Panel (not shown):
8. AC Line Cord: The grounded power cord
should only be plugged into a grounded power
outlet that meets all applicable electrical codes
and is compatible with the voltage, power, and
frequency requirements stated on the rear
panel. Do not attempt to defeat the safety
ground connection.
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
Important Information About Tubes and Tube Products:
A Brief History Of The Tube:
In 1883, Edison discovered that electrons would flow from a suspended filament when enclosed in an evac-
uated lamp. Years later, in 1905, Fleming expanded on Edison's discovery and created the "Fleming Valve".
Then, in 1907, Dr. Lee de Forest added a third component – the grid – to the "Fleming's Valve" and the vac-
uum tube was a fact of life. The door to electronic amplification was now open.
During World War II, data gleaned from their intensive research on the detectors used in radar systems led
Bell Telephone Laboratories to the invention of the transistor. This reliable little device gained quick support
as the new component for amplification. The death of the vacuum tube seemed imminent as designers, sci-
entists, and engineers reveled in the idea of replacing large, fragile glass tubes with these small, solid-state
devices.
However, there were (and still are) many serious listeners who realized that the sound produced by a "tran-
sistor" amplifier is significantly different from that produced by a tube amplifier with identical design specifica-
tions. They considered the sound produced by these new solid-state devices to be hard, brittle, and lifeless.
It was determined that solid-state devices produced a less musical set of harmonics than tubes. When pushed
past their limits, they tend to mute the tone and emphasize the distortion.
Tubes, on the other hand, produce a more musical set of harmonics, the intensity of which can be controlled
by the player. This characteristic adds warmth and definition to the sound which has become the hallmark of
tube amplifiers. When tubes are driven into clipping, the harmonic overtones can be both sweet and pleasing
or intense and penetrating, depending on the musician’s musical taste and playing technique.
Over the years, application engineers have designed a number of outstanding solid-state amplifiers that
sound very, very good. Some use special circuitry which enables them to simulate the distortion characteris-
tics of a tube amplifier. However, the tube amplifier, still held in the highest esteem by many musicians, offers
a classic "vintage" sound in a contemporary market.
Tube Types And Usage:
Tube amplifiers are based primarily on two types of tubes – preamplifier tubes and power tubes. The tubes
used in preamplifiers (12AX7, 12AU7, 12AT7, etc.) are smaller than the power tubes. These tubes amplify
the signal from your instrument and shape the sound. They are inherently microphonic (mechanically pick
up and transmit external noises). Since these tubes are used in the critical first stages of a tube amplifier's
circuitry, it is very important to use high-quality, low noise/low microphonic tubes for this application.
Although tubes of this quality may be difficult to find and typically cost more than "off-the-shelf" tubes, the
improvement in performance is worth the investment.
Preamplifier tubes are also used to drive the power tubes. When used in this application, a 12AX7 will pro-
duce a more distorted tone than a 12AT7, which produces a clearer, sweeter sound. A 12AU7 is even
cleaner and brighter than a 12AT7, giving more definition to the sound. (In some cases it is possible to
change the sound by changing the type of preamp and/or driver tubes. When making any modification to
your equipment, it is highly recommended that you consult with a qualified service center.)
The power tubes are the largest tubes used in an amplifier. These tubes convert the low-level, conditioned
signal from the preamplifier into a level that is sufficient to drive the speakers. There are several types of
power tubes available, each of which offers a different performance/sound characteristic. For example, the
EL34 power tube produces a great Classic rock sound. When an EL34 is driven into distortion it produces a
unique sound ("crunch"). When compared to the EL84 and 6L6, the EL34 distorts more quickly, exhibits a
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
Important Information About Tubes and Tube Products (continued):
"looser" low-end response and produces more harmonics at mid and high frequencies ("creamier" sound).
These differences become more noticeable at higher volumes.
The EL84 and 6L6 tubes produce a big low-end thump and have a very good dynamic range. They offer a
more traditional "American Rock" sound. The EL84 and 6V6 tubes produce a creamy sound with nice dis-
tortion. On the other hand, the KT88 produces a big low-end but sounds more like an EL34 in the mid and
high frequencies.
The 6550 power tubes are more rugged and stay cleaner sounding even at full power. When they do dis-
tort, the sound produced is more solid and has a tighter low end; more of a "heavy metal" type distortion
with lots of power.
Some tubes are available in matched sets. These tubes have been extensively tested for optimum perform-
ance and longevity.
The Nature Of Tubes: Why (And When) To Replace Them:
Tubes are made up of a number of fragile mechanical components that are vacuum-sealed in a glass enve-
lope or bubble. The tube's longevity is based on a number of factors which include how hard and often the
amplifier is played, vibration from the speakers, road travel, repeated set up and tear down, etc.
Any time you notice a change in your amplifier's performance, check the tubes first.
If it's been a while since the tubes were replaced and the sound from your amplifier lacks punch, fades in
and out, loses highs or lows or produces unusual sounds, the power tubes probably need to be replaced. If
your amplifier squeals, makes noise, loses gain, starts to hum, lacks "sensitivity", or feels as if it is working
against you, the preamplifier tubes may need to be replaced.
The power tubes are subjected to considerably more stress than the preamplifier tubes. Consequently, they
almost always fail/degrade first. If deteriorating power tubes aren't replaced they will ultimately fail.
Depending on the failure mode, they may even cause severe damage to the audio output transformer
and/or other components in the amplifier. Replacing the tubes before they fail completely has the potential
to save you time, money and unwanted trouble. Since power tubes work together in an amplifier, it is cru-
cial that they (if there is more than one) be replaced by a matched set. If you're on the road a lot, we rec-
ommend that you carry a spare matched set of replacement power tubes and their associated driver tubes.
After turning off the power and disconnecting the amplifier from the power source, carefully check the tubes
(in bright light) for cracks or white spots inside the glass or any other apparent damage. Then, with the
power on, view the tubes in a dark room. Look for preamplifier tubes that do not glow at all or power tubes
that glow excessively red.
Whenever you replace the power tube(s):
• Always have the amplifier's bias voltage checked by a qualified service center. Improper bias voltage will
cause degradation in performance and possibly damage the tubes and/or the amplifier. (See the section
below entitled, "The Importance of Proper Biasing", for more information on this subject).
• We highly recommend that you replace the driver tube(s) as well. The driver tube determines the shape and
amplitude of the signal applied to the power tube(s) and has to work almost as hard as the power tube(s).
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
Important Information About Tubes and Tube Products (continued):
You can check your preamplifier tubes for microphonics by turning the amplifier on, turning up the gain and
tapping lightly on each tube with the end of a pencil or a chop stick (my favorite). You will be able to hear
the tapping through your speakers, which is normal. It is not normal for a tube to ring like a bell after it’s
tapped. If it does ring then it’s microphonic and should be replaced. Remember to use only high quality, low
microphonic tubes in the preamplifier section.
Even though power tubes are rarely microphonic, you should check them anyway. The power tubes can be
checked for microphonics just like pre-amp tubes.
In the case of very high gain amps, you may be able to reduce the amount of noise generated by simply
swapping the preamp tubes around.
The Importance Of Proper Biasing:
For the best performance and longest tube life, proper biasing is imperative. Bias is the negative voltage
which is applied to the power tube’s control grid to set the level of idle current. We cannot over emphasize
the difference in warmth of tone and dynamic response that come with proper biasing. If the bias is set too
high (overbiased), the sound from the amp will be distorted at all levels. If the bias is set too low, (under
biased) the power tubes will run hot (the plates inside the tubes may glow red due to excessive heat) and
the sound from the amplifier will lack power and punch. The excessive heat greatly reduces tube life – from
a few days to as little as a few hours in extreme cases. Setting the bias on your amp is like setting the idle
on your car. If it’s too high or hot it’s running away with you and if it’s too low or cold it will choke when you
step on it.
The bias is adjusted at the factory in accordance with the type of power tube(s) installed in your amplifier. It
is important to point out that tubes of the same type and specification typically exhibit different performance
characteristics. Consequently, whenever power tubes are replaced, the bias voltage must be checked
(unless the amplifier is equipped with "self-biasing circuitry) and readjusted to accommodate the operating
parameters of the replacement tubes.
Depending on the model and amplifier type, there may be hum balance controls, trim pots, or bias adjust-
ment controls on its rear panel. However, the bias adjustment should be performed only by qualified service
personnel with the proper, calibrated test equipment.
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
Important Information About Tubes and Tube Products (continued):
Survival Tips For Tube Amplifiers:
To prolong tube life, observe these tips and recommendations:
• Match the impedance of your speaker cabinet(s) to your amplifier. Improper impedance matching will con-
tribute to early tube degradation and may cause premature tube failure.
• Make sure the speaker(s) are properly connected prior to turning on the amplifier.
• After playing the amplifier, allow sufficient time for it to properly cool down prior to moving it. A properly
cooled amplifier prolongs tube life due to the internal components being less susceptible to the damage
caused by vibration.
• Allow the amplifier to warm up to room temperature before turning it on. The heat generated by the tube
elements can crack a cold glass housing.
• Replace the output tube(s) before the performance degrades or the tubes fail completely. Replace the
tube(s) on a regular basis (at least once per year or as often as every 4 to 6 months if you play long and
hard every day).
• Always have the bias checked after replacing the output tubes (unless the amplifier is equipped with "self-
biasing circuitry"). This should be done ONLY at a qualified service center. Improper biasing could result
in the tubes running too hot, which greatly reduces the life of the tubes – or too cold, which results in dis-
torted sound regardless of level settings. Do not play the amplifier if it exhibits these symptoms – get the
bias checked/adjusted immediately to prevent tube failure and/or other damage.
• If the locating notch on the base of a power tube breaks off, replace the tube. This significantly reduces
the risk of damaging your amplifier by incorrectly inserting the tube.
• Protect the amplifier from dust and moisture. If liquid gets into the amplifier proper, or if the amplifier is
dropped or otherwise mechanically abused, have it checked out at an authorized service center before
using it.
• Proper maintenance and cleaning in combination with routine checkups by your authorized service center
will insure the best performance and longest life from your amplifier.
CAUTION: Tube replacement should be performed only by qualified service personnel who are
familiar with the dangers of hazardous voltages that are typically present in tube circuitry.
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
Suggested Settings
OUT
CLEAN
SOUND:
OUT
CRUNCHY
ROCK:
IN
PICK
ATTACK:
IN
CHOCOLATE:
IN
CHUNKS:
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
System Block Diagram:
12AX7A
V1A
12AX7A
V1B
EL84
V2
SPEAKER
INPUT
VOLUME TONE
ON/
OFF
GAIN
LINE OUT
Declaration Of Conformity
#35, Effective 01-01-2001
SLM Electronics
Manufacturer’s Name:
Production Facility:
11880 Borman Drive, St. Louis, MO 63146, USA
700 Hwy 202 W, Yellville, AR 72687, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
Production Facility:
Shipping Facility:
Office Facility:
Product Type:
Audio Amplifier
Complies with the following Standards:
Safety:
EMC:
EN60065, E60065, C22.2, UL6500 and/or UL813
Directive 89/336/EEC, EN55103, EN55013, EN61000,
and/or FCC 47CFR 15B clA
Supplementary information provided by:
SLM Electronics - R & D Engineering
1901 Congressional Drive, St Louis, MO 63146, USA
Tel.: 314-569-0141, Fax: 314-569-0175
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CRATE CR-1 LIMITED EDITION GUITAR AMPLIFIER
Technical Specifications:
OUTPUT POWER RATING
INPUT IMPEDANCE
MAX. SIGNAL ACCEPTED
SIGNAL TO NOISE RATIO
GAIN
5 W RMS @ 10%THD, 8 ohm load, 120 VAC
1 M ohm
2v peak-to-peak
70dB typ
60dB w/ Gain switch off, 90dB w/Gain switch on
33dB @ 10kHz
TONE CONTROL
LINE OUT LEVEL
0.5V RMS
INTERNAL SPEAKER
PREAMP TUBE
10”, 8 ohm, 30 W
(1) 12AX7A
POWER AMP TUBE
POWER REQUIREMENTS
(1) EL84
120VAC, 60Hz, 60VA
100/115VAC, 50/60Hz, 60VA
230VAC, 50/60Hz, 60VA
17-14” H x 15-1/4” W x 9”D; 21 lbs.
SIZE AND WEIGHT
Crate continually develops new products, as well as improves existing ones. For this reason, the
specifications and information in this Crate manual are subject to change without notice.
©2003 Crate Amplifiers • A division of St. Louis Music 1400
Ferguson Avenue • St. Louis, MO 63133
P/N 47-879-01
071403
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