Loredo T15-R Manual REV2
Please read ALL Safety & Operating Instruction BEFORE using this product.
CAUTION: To avoid the risk of fire or electric shock, please do not expose this
product to rain or moisture. Dangerous high voltages are present inside the enclosure.
Do not open the cabinet or remove either the front or the back cover. Refer servicing to
qualified personnel only.
Power Sources
This product should be operated only from the type of power source indicated on the
marking label. If you are not sure of the type of power supply to your home, consult
your product dealer or local power company.
Insertion Warning & Liquid Spilling
Never insert objects of any kind into this product, as they may touch dangerous voltage
points or short out parts that could result in a fire or electric shock. Never spill liquid
of any kind on the product. The apparatus shall not be exposed to dripping or splashing
and that no object filled with liquid, such as vases, shall be placed on the apparatus.
Do not attempt to service this product yourself as opening or removing covers may
expose you to dangerous voltage or other hazards. No user serviceable parts inside.
Refer all servicing to qualified service personnel.
The product should be placed away from heat sources, such as radiators, stoves, or
other products (including amplifiers) that produce heat.
Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or
aerosol cleaners. Use a damp cloth for cleaning.
Safety Check
Upon completion of any service repairs to this product, ask the service technician to
perform safety checks to determine that the product is in proper operating condition.
Welcome to the Johnson Musical Instruments Corporation and congratulations on choosing
our product - The Johnson Loredo hybrid tube amplifier, T15-R. Johnson has put many years
of expertise into the sound and design of this product, while still maintaining value and quality.
Your “hybrid” amplifier combines the unique tonal character of a tube preamp with the reliability
and consistency of a solid-state power section. Please refer to this manual for important
information and guidance before operating the unit.
Output Power: 15 Watts RMS into 8Ω AlphaTone 8” Speaker
Equalizer Controls: Bass, Middle, Treble
Volume/Gain Controls
Additional Controls:
- Accutronics Reverb
- Footswitch Jack to engage/disengage reverb
- Headphones Jack
- Power Switch
(Please refer to Fig.1 and Fig. 2 for details)
Fig. 1
1. Input: Use to connect the signal output from an electric guitar. (Use a shielded cable with
1/4” mono plug).
2. Gain: Use this control to adjust the preamp level. Higher Gain settings allow more overdrive
into the sound.
3. Volume: Overall volume adjustment. Turning this knob clockwise (0-10) increases the overall
sound level.
Equalizer/Tone controls (Bass, Middle and Treble)
4. Bass: Use this control to adjust the low frequency level. Turning this knob clockwise to
boost the bass tone, counter clockwise to cut the bass tone accordingly. Center position
(straight up) provides no cut or boost.
5. Middle: Use this control to adjust the middle frequency level. Turning this knob clockwise
to boost the mid tone, counter clockwise to cut the mid tone accordingly. Center position
(straight up) provides no cut or boost.
6. Treble: Adjusts the high frequency level. Turning this knob clockwise to boost the treble
tone, counter clockwise to cut the treble tone accordingly. Center position (straight up) provides
no cut or boost.
7. Reverb: Adjusts the amount of sound reverberation/reflection effect to the guitar’s signal.
8. Foot Switch: Controls the Reverb on/off with single button footswitch. (Optional)
9. Headphones: Use this jack to connect headphones to the amplifier. The internal speaker is
disengaged when headphones are being used for private listening. (Your ears are valuable!
There could be damage to your ears if you listen at high volumes for long periods of time.)
10. LED: LED will be lit when the switch is in the upward position (Power On); LED will be
off when the switch is in the downward position (Power Off).
11. Power Toggle Switch: Indicates Power On (Upward position) or Power Off (downward
Fig. 2
12. Power IEC Socket/Fuse Holder: Use the included power cord with this unit in accordance
with the voltage and frequency ratings listed on this manual and rear panel of this amplifier.
The fuse is the amplifier’s protection device. In the event of a power malfunction, the fuse
will engage, disconnecting the power source and the amplifier, therefore preventing the amplifier
from severe damage. If the amplifier shuts down while in use, unplug the amplifier, open the
fuse holder, check the fuse and replace if necessary (Replaced fuse must be at the same rating
voltages and current). Consult a qualified service technician if problem continues.
Power Requirements & Consumption
120VAC, 60Hz
100/115VAC, 50/60Hz
220VAC/230VAC/240VAC, 50/60Hz
Total Output Power (RMS)
15W (RMS) into 8Ω
Frequency Response
130Hz to 16kHz
Sensitivity (Full Gain)
Signal To Noise Ratio (S/N)
Total Harmonic Distortion (%) THD
0.05% THD @ 5 Watts RMS into 8Ω Load @ 1kHz
0.10% THD @ 15 Watts RMS into 8Ω Load @ 1kHz
Tone Controls
Bass (at 150Hz)
Mid (at 1kHz)
Treble (at 10kHz)
Accutronics/Johnson Reverb
Input: 1/4” Mono Jack with 1MΩ impedance
Footswitch: 1/4” Mono Jack
Headphones: 1/4” TRS Jack
(Mono or Stereo 1/4” Plug will work)
8” 8Ω AlphaTone
Preamp Section
1 x 12AX7WA/7025 Tube
Dimensions (W x H x D):
13.75” x 15” x 8” (35cm x 38cm x 20cm)
Net Weight
21.5 lbs (9.76 kg)
This amplifier is warranted, to the original Purchaser, to be free from defects in material
and workmanship for a period of five (5) years, excluding the Tube, which is warranted
for ninety (90) days, from the original date of purchase.
The manufacturer shall, at its option, either repair or replace the defective product if
the product is returned to the original place of purchase. If any product returned is not
defective within this warranty, the manufacturer shall so advise the Purchaser and
thereafter shall dispose of said product in accordance with the Purchaser’s instructions
and at the Purchaser’s cost. This warranty is not transferable by the Purchaser.
The warranty shall not apply, if the product has been misused or damaged as a result of
neglect, abuse, alteration, improper handling, unauthorized repair or modification, accident
or causes external to the product, such as, but not limited to, excessive heat or humidity.
The manufacturer’s sole and exclusive maximum liability for any claim by the Purchaser
shall not exceed the wholesale value of the product. In no event shall the manufacturer
be liable for any indirect, incidental, collateral, exemplary, or consequential damages
of losses arising out of the Purchaser’s purchase of the product. The above limitations
may not apply in some states (U.S.).
“Remember, the idea is to experiment and have fun with your new amplifier. Try different
guitars, pickups, and effects devices to come up with exciting and different sounds. Your style
and individual tone will come as a result.
Musical Instruments Co., Ltd. Corp.
Printed in China
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