Chandler Limited REDD.47 User manual

For more information, visit www.chandlerlimited.com. © 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
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Chandler Limited®
REDD.47 Mic Amplier
User Manual
OFFICIAL
EQUIPMENT

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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
OFFICIAL
EQUIPMENT
Chandler Limited®
REDD.47 Mic Amplifier
User Manual
Thank you for purchasing the Chandler Lim-
ited REDD.47 Mic Amplifier, you now own a
piece of EMI / Abbey Road Studios official
equipment.
The Chandler Limited REDD.47 Mic Amplifier
is a recreation of the highly sought after
and rare EMI / Abbey Road Studios REDD.47
vacuum tube based line amplifier. The Chan-
dler Limited REDD.47 Mic Amplifier is a
mono channel, and incorporates an extended
feature set over the original equipment.
Your Chandler Limited REDD.47 Mic Amplifi-
er has been carefully crafted and built by
hand at Chandler Limited in Shell Rock IA,
U.S.A, using through-hole components for
the ultimate analog experience.
At Chandler Limited we are proud of our
American made products and we hope you like
them!
Please feel free to call our shop anytime
for help or questions. Phone: (319) 885-
4200
HISTORY
The EMI / Abbey Road Studios REDD.47 line
amplifier was first conceived in 1958 as a
replacement plug-in, all purpose line am-
plifier cassette for the Telefunken/Siemens
V72s as used in early REDD mixing consoles.
In 1958, EMI and Abbey Road Studios,
through their REDD (Record Engineering
Development Department) division, set out
to design the next generation REDD mixing
console, the REDD.51. The REDD.51 would be
the last of the valve or vacuum tube-based
mixing consoles built by EMI, and the only
one to rely on the REDD.47 line amplifier.
The first REDD.51 console of only three
built was manufactured in 1959. However,
it wouldn’t be until 1964 before a REDD.51
console was installed at Abbey Road Stu-
dios’ Studio Two, home to the Beatles.
The REDD.51 console and its REDD.47 line
amplifiers left their unique and excep-
tional sonic character on Beatles records
recorded at Abbey Road Studios’ Studio Two
during 1964-1968; the majority of the Bea-
tles’ catalog.

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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
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CONNECTIVITY
POWER
The REDD.47 Mic Amplifier features an internal power supply. Connection is made using the
supplied IEC power cable. Power is preset internally to operate at either 120V or 220V.
INPUT/OUTPUT
On the rear panel of the REDD.47 Mic Amplifier exists two XLR jacks, one for input, and
the other for output.
The XLR input is activated when the MIC/DI switch is set to ‘MIC’ or the up position.
Output signal will be available from the male XLR jack.
XLR jacks are wired pin 2 hot.
TUBES
The REDD.47 Mic Amplifier relies on two vacuum tubes: EF86, E88CC.

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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
MIC/DI
The MIC/DI switch allows the REDD.47 to function as
a mic/line amplifier, or a tube DI. For line level
applications, reference the ‘PAD’ section.
In the ‘MIC’ position or up, signal is applied via
the XLR input at the rear of the unit.
To access DI functionality, set the MIC/DI switch
to ‘DI’ or down, and plug your guitar or bass gui-
tar into the accompanying ¼” jack. DI access sends
your signal directly into the heart of the tube.
Using the REDD.47 in DI mode is similar to plugging
directly into a VOX AC15.
When using the DI, the output signal will be avail-
able from the male XLR jack on the rear of the
unit.
TIP: Start a REVOLUTION! One the most iconic if not unique guitar sounds is that of the
Beatles song ‘Revolution.’ John Lennon’s guitar sound was created without the use of a
guitar amplifier, by plugging directly into the line amplifier, overdriving one REDD.47
in another.
Overdriving the REDD.47 can be achieved in the following ways:
1. Use two, REDD.47 units in series, overdriving a second unit with gain from the first
unit.
a. ‘Revolution’ style – via DI, plug your guitar directly into the first REDD.47, and
patch the XLR out from the first unit into a second REDD.47.
2. Using a single REDD.47, plug your guitar or bass directly into a boost pedal (Chandler
Limited Little Devil Colored Boost or other into), and from the boost pedal into the
¼” DI jack.
3. Re-amp a source signal by applying a hot signal from your DAW to the XLR input of the
REDD.47.
4. Apply a hot source via microphone to the REDD.47.
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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
VOLTAGE GAIN
The ‘VOLTAGE GAIN’ control is a stepped input gain switch,
preset in 6db increments. The gain range available from this
control is expanded to 16-52db from the original REDD.47’s
34, 40, and 46db. Use this control to set the desired input
gain. An additional +/-5db input gain is available via ‘FINE
GAIN SET’.
FINE GAIN SET
The ‘FINE GAIN SET’ control is
a stepped switch allowing for
fine-tuning of the input gain.
The ‘FINE GAIN SET’ offers
an expanded range of +/-5db
available in 1db increments
over the original REDD.47 line
amplifier.
TIP: When gain staging, begin with ‘OUTPUT’ fully clock-
wise, ‘FINE GAIN SET’ at zero, and set the gain first using
the ‘VOLTAGE GAIN’ control. Once the approximate ‘VOLTAGE
GAIN’ or input gain has been acquired, use the ‘FINE GAIN
SET’ control to adjust for optimum level, and color.
NOTE: When ‘VOLTAGE GAIN’ and ‘FINE GAIN SET’ are set fully
clockwise at the highest settings, the total input gain is
57db.
RUMBLE FILTER
The ‘RUMBLE FILTER’ control is a low cut mechanism,
featuring an expanded eight frequency settings (30,
45, 60, 70, 90, 110, 130, 180hz.) The ‘RUMBLE FILTER’
may be fully disengaged from the amplifier by setting
it to ‘OUT.’ This feature is useful for removing un-
wanted low frequency information from the signal. The
‘RUMBLE FILTER’ only works upon signal applied to the
XLR input.
NOTE: The original ‘RUMBMLE FILTER’ was a filter cir-
cuit available via jumper on the REDD.51 console. This
‘RUMBLE FILTER’ was both unique in circuit design and
function, rolling off bass at 30hz. The filter was ap-
plied after the line amplifier, and before the fader.
OUTPUT
The ‘OUTPUT’ control is variable, and acts as a fader
would on a console. Use this to control the overall
output level of the pre-amplifier to your recording
device or DAW. ‘OUTPUT’ set fully clockwise is consid-
ered unity level.
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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
PAD
A 20db pad exists to tame hot sources applied to the MiC Input XLR
jack. To engage the 20db pad, flip the ‘PAD’ switch to the down
position. The ‘PAD’ is handy for taming hot signals, or using the
REDD.47 for line level sources. Use a pair of REDD.47 Mic Ampli-
fiers on your mix bus! The ‘PAD’ only works upon signal applied to
the XLR input.
TIP: Sending line level source material into the REDD.47 is a great
way to further process your material, adding the rich harmonic
texture available from this historic tube amplifier.
To use the REDD.47 at line level, begin with ‘VOLTAGE GAIN’ at
‘16,’ ‘FINE GAIN SET’ at ‘0,’ and engage the 20db ‘PAD.’ Apply
source signal via the XLR input, bring up ‘VOLTAGE GAIN’ if needed,
and adjust the ‘FINE GAIN SET’ for the desired color.
If using on your mix bus, turn down your DAW’s master fader enough
not to distort the REDD.47’s input (you might not need the PAD ei-
ther), then turn up the ‘VOLTAGE GAIN’ and use the ‘FINE GAIN SET’
to dial in the right color; let the REDD.47 do it’s job, AMPLIFY!
POLE
The ‘POLE’ switch reverses the input signal by 180ºwhen in the
down position. This feature may be useful when a microphone is not
ideally placed, a cable is wired incorrectly, or line level source
material is out of phase.
48 VOLT
Some microphones require phantom
power. Phantom power is available
via use of the ‘48 VOLT’ switch,
and is engaged when the switch is
set to the down position.
WARNING: Only engage or disengage
phantom power with the microphone
already connected to the pre-ampli-
fier. Disconnecting a microphone
while phantom power is on may cause
damage to equipment downstream.
Never use phantom power with ribbon
microphones.
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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
U.S. SERVICE
Prior to sending in your gear for repair, please contact our shop at the number below. We
will assist you in troubleshooting the problem and, if needed, we will issue you an RMA#
to send in the gear.
Send repairs to:
Chandler Limited, Inc.
Attention: Repairs
222 S. Cherry St.
PO Box 38 (if sending via the postal service)
Shell Rock IA 50670
Phone: [phone]
Email: [email protected]
INTERNATIONAL SERVICE
Repair of Chandler Limited products purchased outside of the United States, is provided
by local or regional authorized Chandler Limited distributors. To obtain service or re-
pairs, please contact your local dealer or regional distributor for further instruction.
Visit chandlerlimited.com for a list of authorized International Distributors.
CE Certification
Chandler Limited declares under its sole responsibility that all products manufactured
by them are in compliance with Electromagnetic Compatibility (EMC) Directive 2014/30/EU;
Standards: EN55103-1:2009+A1:2012; EN55103-2:2009; EN55013:2013 and Low Voltage Direc-
tive (LVD) 2014/35/EU; Standards: EN60065:2002+A1:2006+A11:2008+A2:2010+A12:2011.

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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
PRODUCT LIMITED WARRANTY
During the rst year from the date of the original purchase, this product is warranted to be free from defects in materials and
workmanship under normal use, service and maintenance. This warranty applies to the original purchaser and is subject to
the following terms and conditions:
What Is Covered: The product’s components as originally installed by the manufacturer that are defective in materials or
workmanship under normal use, service and maintenance, except expendables dened as vacuum tubes and meter or badge
lamps, which are covered by a lesser warranty period as set forth below.
What Is Not Covered By This Warranty: This warranty does not extend to or cover:
1. Any defect due to the negligence of others; failure to install, operate or maintain the product properly; unrea-
sonable use; accidents; alteration; use of unauthorized or non-standardized parts; acts of God; theft; vandalism;
electrical malfunctions (i.e., resulting from power surges, shorted or overloaded circuits, etc.), use of any power
source other than supplied by manufacturer; repair by anyone other than an authorized Chandler Limited repre-
sentative; or damage resulting from improper packing or mishandling by a shipper.
2. Normal wear and tear of parts.
3. Shipping, handling, packaging and delivery costs of the product.
Who Is Covered: The original purchaser.
Repair During The First Year for non-expendables: During the rst year, all defective product components that are
covered by this Limited Warranty will be repaired free of charge including parts and labor. The purchaser will pay all shipping
costs AND a $35 handling fee per unit.
Repair During The First 90 Days for expendables: During the rst 90 days, all defective expendables (vacuum tubes
and meter or badge lamps) that are covered by this Limited Warranty will be replaced or repaired free of charge including
parts and labor. The purchaser will pay all shipping costs and a $35.00 handling fee per unit.
WhatYou Must Do for Warranty Service (in the United States): If you live in the United States and your product
was purchased through a U.S. Dealer, please contact your dealer OR call 319-885-4200 or email support@chandlerlimited.
com.
WhatYou Must Do for Warranty Service (outside of the United States): For warranty service if you live outside
of the United States, please contact the dealer where you purchased the product.
Any products returned to Chandler Limited for repair should include: (1) complete description of the problem; (2) name,
address, phone number, fax number, and/or e-mail address; (3) receipt of original purchase; (4) power supply and all acces-
sories and cables. The purchaser is responsible for the shipping costs to and from Chandler Limited. Chandler Limited is not
responsible for damage resulting from improper packing and/or mishandling by a shipper.
If sent by UPS or Federal Express, ship to: Chandler Limited, 222 South Cherry Street, Shell Rock IA 50670
If sent by Postal Service, ship to: Chandler Limited, PO Box 38, Shell Rock IA 50670
The foregoing expresses Chandler Limited’s obligations and liabilities with respect to the quality of the product, its compo-
nents and accessories. All other warranties, express or implied, including the warranties of merchantability or tness for a
particular purpose are disclaimed. Chandler Limited shall not be liable for the loss or use of the product, its components and
accessories, inconvenience, loss or any other damages, direct or consequences arising out of the use of, or inability to use the
product or its components or damages resulting from or attributable to defects in the products or its components. No one
other than Chandler Limited has authority to extend or modify the terms of this limited warranty in any manner whatsoever.

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For more information, visit www.chandlerlimited.com.© 2023 Chandler Limited, Inc. All Rights Reserved. RD47_UM_080323
Abbey Road Studios, EMI, REDD and their associated logos are trademarks of EMI (IP) Limited.
DISCLAIMER OF WARRANTY
EXCEPT FOR THE FOREGOING WARRANTIES, CHANDLER LIMITED HEREBY DISCLAIMS AND EXCLUDES ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO ANY AND/OR ALL IMPLIED WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND/OR ANY WARRANTY WITH REGARD TO ANY
CLAIM OF INFRINGEMENT THAT MAY BE PROVIDED IN SECTION 2-312(3) OF THE UNIFORM COMMERCIAL CODE
AND/OR IN ANY OTHER COMPARABLE STATE STATUTE.
LIMITATION OF LIABILITY
THE LIABILITY OF CHANDLER LIMITED, IF ANY, AND PURCHASER’S SOLE AND EXCLUSIVE REMEDY FOR DAMAGES
FOR ANY CLAIM OF ANY KIND WHATSOEVER, REGARDLESS OF THE LEGAL THEORY AND WHETHER ARISING IN
TORT OR CONTRACT, SHALL NOT BE GREATER THAN THE ACTUAL PURCHASE PRICE OF THE PRODUCT WITH RE-
SPECT TO WHICH SUCH CLAIM IS MADE. IN NO EVENT SHALL CHANDLER LIMITED BE LIABLE TO PURCHASER FOR
ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY KIND INCLUDING, BUT NOT LIM-
ITED TO, COMPENSATION, REIMBURSEMENT OR DAMAGES ON ACCOUNT OF THE LOSS OF PRESENT OR PROSPEC-
TIVE PROFITS OR FOR ANY OTHER REASON WHATSOEVER.