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Chandler Limited Redd 47

Test & Review

Do you want to equip your professional studio with a tube preamplifier? You can opt for the Chandler Limited Redd 47. It is a rare and authentic preamp with a design that relies on two vacuum tubes. Discover our complete test of this preamplifier through this guide.

🎤 by Kevin Jung

Summary of the Test 👇

The Chandler Limited Redd 47 is a legendary and signature amplifier from Abbey Road Studios . Its use had made it possible to record most of the successful albums of The Beatles Group. The amplifier itself is provided only with the strict adjustment necessary to amplify and embellish the recording sound of the singing voice or that of an electric guitar.

However, its design based on two EF86 , E88CC vacuum tubes makes it unique. Its notched gain potentiometer optimizes audio quality while its gain filter allows the sound to be further boosted by plus or minus 5 dB . Is the Chandler Limited Redd 47 a smart purchase for someone who is an audiophile? Below is our opinion and complete test!

Chandler Limited Redd 47 Preamplifier Overview

Chandler Limited Redd 47 is the iconic amplifier from Abbey Road Studios, the production house to which The Beatles owe their success.

The Chandler Limited Redd 47 is also one of the rarest and most authentic hand-made line preamps It is clear that the units from Chandler Limited in Shell Rock IA, in the United States, are therefore produced in limited series .

The design of the Chandler Limited Redd 47 preamp is based on two vacuum tubes: EF86, E88CC. As the unit only has one mono channel , it can be connected to another Chandler Limited Redd 47 preamp to optimize the Stereo sound processing of your audio jacks.

All over a frequency range between 20 Hz and 20 kHz . The Chandler Limited Redd 47 can therefore be used perfectly to amplify the sound signal coming from different audio sources in the high frequencies as well as in the mid and low frequencies.

Chandler Limited Redd 47 purchase
Chandler Limited Redd 47

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On the front of the preamp, there is a MIC/D/I switch which allows you to choose between two input modes: MIC (for the microphone input) and D/I (for the input dedicated to instruments and various audio devices). Under the MIC/D/I switch, you can directly insert a balanced 6.35 TRS jack plug to amplify the sound of a guitar or electric bass in analog mode.

In MIC Input , we will instead use the dedicated XLR (female) input for studio microphones accessible from the rear of the Chandler Limited Redd 47 preamp. After the MIC/D/I switch, we first access the potentiometer gain “ VOLTAGE GAIN dB ” definable in increments of 6 dB over a range of 16 to 52 dB .

Right next to it, we access the Pad 20 dB switch which acts as an attenuator. The same panel provides two other adjustment potentiometers in superposition. RUMBLER FILTER c/s setting (located just above the OUTPUT knob) acts much like a low-cut filter .

It gives a fairly wide adjustment range of: 0, 30, 45, 60, 70, 90, 110, 130 and 180 Hz. Below the “RUMBLER FILTER c/s”, we access the OUTPUT adjustment potentiometer and whose the function would be similar (roughly) to that of a fader on an external audio equalizer or on a mixing desk .

Chandler Limited Redd 47
Picture from United-music.ru

Via the Chandler Limited Redd 47, we will also access a “Pole” switch (or phase inverter ) which will be used to reverse the polarity of the microphone for better capture of the audio signal . Next to the “Pole” switch we access the “ FINE GAIN SET ” potentiometer to fine-tune the sound gain (perceptible at the input) from between -5 and +5 dB in increments of 1 dB .

Just after the “FINE GAIN SET” potentiometer, we can find a 48V switch that can be activated when we need to connect a studio condenser microphone that requires phantom power to operate.

At the right end of the Chandler Limited Redd 47 (on its front), there is an on/off switch which is used to activate or deactivate it. The corresponding indicator lights up red when the preamp, connected to the mains, is activated.

On the back of the Chandler Limited Redd 47, we will find a female XLR microphone input as well as a male XLR output . We can also use this output to connect the Redd 47 to an external sound equalizer and via which we can insert the mini-jack of an audio monitoring headset.

The rear panel also includes a power supply unit through which you can mains power cable To connect a vinyl record player, you will need to use a modulation cable specially designed and designed for high-level sources.

Chandler Limited Redd 47 purchase
Chandler Limited Redd 47

AT THE LOWEST PRICE 👇

Sufficiently resistive and captive, it is fully capable of transmitting a signal greater than 1 V Rms with an impedance which far exceeds the threshold of 10,000 Ohms (or 10 k Ω ). If you plan to combine the use of the Redd 47 with that of a phono preamp like the SPL Goldmike 9844, you will need to use another modulation cable with different connectors: RCA, XLR, HDMI, DIN, USB port, etc.

This will allow you to effectively connect the Redd 47 module to various types of audio, hi-fi and multimedia devices: vinyl turntable, UHF and VHF player, HD and uhd (or Ultra HD) player, LCD screen television, speaker home theater with integrated amplifier, Desktop Computer, etc.

You may also need a Switch to connect the amp to several ports or different interfaces in order to optimize audio transfer ( natively analog ) to digital. In particular thanks to an adequate (and therefore compatible) digital Dsp sound processor

The digitized sound can then be personalized according to your wishes. All without the need to use a class D amplifier which often remains (quite) expensive.

Chandler Limited Redd 47 Amplifier
Picture from Audiofanzine.com

Features of the Chandler Limited Redd 47

The Chandler Limited Redd 47 is a tube preamplifier with MIC and D/I inputs. The preamp audio system remains faithful to the technical sonic principles and manufacturing technologies of Abbey Road Studios' rare original EMI REDD.51 . The Chandler Limited Redd 47, however, benefits from a certain number of advantages which characterize it from its ancestors.

The microphone preamp thus provides increased sound gain with a audio colorimetry ranging from pure sound to warm and dynamic sound, including classic and vintage sounds. In addition to meeting the original design of Abbey Road Studios, the Chandler Limited Redd 47 provides features that meet the norms and standards adopted in current studios.

The Chandler Limited Redd 47 Mic and Electric Guitar Preamplifier features a power supply. Its connection to the mains is carried out via an IEC cable provided and which must be plugged into the rear. The voltage is pre-adjustable to 120 or 220 Volts .

The rear of the Chandler Limited Redd 47 preamplifier has two XLR sockets: a female socket to serve as a microphone input and a male socket to serve as MIC Output. The dedicated XLR input receives the sound signal from the dynamic or condenser microphone when the MIC/D/I switch is set to “MIC”, i.e. up.

Chandler Limited Redd 47 purchase
Chandler Limited Redd 47

AT THE LOWEST PRICE 👇

For the line level input, insert the 6.35 TRS analog jack plug into the front of the preamplifier. This will directly amplify the sound of an electric guitar or that of an electro-acoustic bass guitar.

The design of the Chandler Limited Redd 47 preamp is based on two vacuum tubes: EF86, E88CC.

This switch is used to switch between two modes of receiving an electrical sound signal at the input of the Channel Limited Redd 47 preamplifier. When the switch is positioned upwards, the preamp receives the microphone input signal, the connection of which is made by via the XLR Input jack accessible from the rear panel.

Trapped down, the switch receives the signal from the D/I (or line level) input. The analog connection via 6.35 TRS jack is made directly on the front of the Chandler Limited Redd 47 preamp, under the MIC/D/I switch.

For audio devices equipped with a male mini-jack output, the use of a specific adapter is required. This access will allow the electrical signal (emitted from the instrument) to be transmitted directly into the circuit of the Channel Limited Redd 47 preamplifier.

The “ Voltage Gain ” potentiometer is an incoming audio signal gain potentiometer. 6 dB increments over a gain range of 16 to 52 dB . With the Chandler Limited Redd 47 preamplifier, you can even boost this gain to plus or minus 5 dB from the “FINE GAIN SET” setting.

The “FINE GAIN SET” control allows you to fine-tune the incoming audio gain setting . This potentiometer scaled in 1 dB allows you to fine-tune the sound on an extended scale of between -5 and 5 dB .

Chandler Limited Redd 47 microphone amplifier
Picture from Audiofanzine.com

The Chandler Limited Redd 47 incorporates a “RUMBLE FILTER” potentiometer with approximately the same functions as a low-cut filter . This setting can be used effectively to eliminate extraneous noise .

The “RUMBLE FILTER” potentiometer provides eight extended frequency settings: 30, 45, 60, 70, 90, 110, 130, 180 Hz. Be careful, however, because this setting is only designed to operate on the processed and amplified sound signal from the XLR input.

The “OUTPUT” knob located just below the “RUMBLE FILTER” acts much like the “ Fader ” on a mixer or audio mixer. It can be used to control the overall output level of the Chandler Limited Redd 47 to an audio mixing console.

The 20 dB is in reality nothing other than an attenuation pad which allows you to tame the sound source introduced to the XLR microphone input ( ribbon microphone, dynamic microphone and condenser microphone) and to purify it. the best. The attenuation pad is activated as soon as you position the corresponding switch down.

It can also be used to reduce the risk of sound saturation likely to weigh down the audio effects of electric instruments at the analog jack input on the front of the preamp.

The “POLE” switch is actually used to reverse the phase. Its activation will thus make it possible to invert the input signal by 180° when it is poorly perceived. This setting is practical to allow the Chandler Limited Redd 47 preamp to properly capture the incoming signal whether for the Microphone input or the DI input.

Chandler Limited Redd 47 purchase
Chandler Limited Redd 47

AT THE LOWEST PRICE 👇

The phase or polarity inverter also remains very practical to ensure a perfectly symmetrical analog connection. This remains all the more useful for connections that require the use of a long cable for microphone, electric guitar or electro-acoustic guitar.

This switch is dedicated to microphones (like the Lauten Audio Atlantis FC-387 or other condenser mics) that require phantom power to operate. Neumann or SE Electronics type electrostatic condenser microphone .

Power turns on when the 48V switch is on. However, you must ensure that it is deactivated when you wish to use it with dynamic microphones (such as the Shure Super 55 Deluxe ) regardless of its directivity: omnidirectional, bidirectional, cardioid, etc.

To avoid damaging the preamp and the transducer or audio recorder that you will have to use, you must absolutely ensure that you only use a 48 Volt condenser microphone .

You should not use phantom power with a ribbon microphone, capsule microphone, or dynamic moving coil microphone (like a simple Yeti type USB microphone) as this could damage it and damage the microphone. Chandler Limited Redd 47 amp.

Chandler Limited Redd 47 Amplifier review
picture from Audiofanzine.com

Zoom on the sound quality of the Chandler Limited Redd 47 preamp

The Chandler Limited Redd 47 is a line amplifier and its design dates back to 1958 when through their REDD division ( Record Engineering Development Department ), the professional engineers at Abbey Road Studios / EMI decided to design Redd 51 : a mixing console Next generation REDD

This was even the only vacuum tube amp model built by EMI and above all the only one whose technology is based on the design of the Redd 47 line amplifier. The very first Redd 51 console was produced in just 3 units in 1959.

The Redd 51 console and its Redd 47 line amplifiers left a unique and exceptional sonic imprint on most of The Beatles' records, recorded in the Abbey Road studio between 1964 and 1968.

The Chandler Limited Redd 47 is a safe bet, as it provides the continuous average Rms power needed to amplify sound optimally. For most tube amplifiers , the power supplied is often limited between 2x25 and 2x45 Watts , but due to the manufacturing quality of the output transformer (as in the case of the Chandler Limited Redd 47), they give a feeling of high sound power, refined and clearly defined.

Chandler Limited Redd 47 purchase
Chandler Limited Redd 47

AT THE LOWEST PRICE 👇

The Redd 47 also fulfills all the characteristics of a Class A amplifier (like that of an AMS Neve 1073 DPX ) thus very significantly limiting any distortion of the audio signal at the output; thus providing very high-fidelity sound reproduction . The Chandler Limited Redd 47 can also be used to connect to a home cinema speaker or a powerful loudspeaker, capable of withstanding high Spl sound pressures ranging from 97 to 120 dB .

The Chandler Limited Redd 47 amplifier module is characterized by its unrivaled, punchy and rather aggressive sound footprint. The musicality of the sound that emerges is both refined and colorful . The characteristics of the Chandler Limited Redd 47 amp perfectly meet the standards of recording and sound processing in today's professional studios

Once the D/I switch is engaged, you switch to line mode. You plug in the 6.35 jack plug of your electric guitar equipped (or without) a distortion (or effect) pedal. The electrical audio signal comes out clean , enriched and colorful at the male XLR output on the rear of the Chandler Limited Redd 47.

Moreover, the unique and atypical sound imprint of John Lennon's electric guitar (in the Beatles' song “Revolution”) was created directly from the amp, therefore without an effects pedal. However, this requires the Chandler Limited Redd 47 to be connected in series to another amp of the same brand, type and model.

Chandler Limited Redd 47 microphone amplifier
Picture from Twitter.com

Note in fact that the sound quality of the Chandler Limited Redd 47 power amplifier can be optimized and boosted by adopting the overdrive technique . For this, we will have three options:

  1. amplify the sound of an electric guitar . In this case, you will need to use an effects pedal or a distortion pedal. First, we will come and connect our guitar to its pedal. Then, the boosted sound that will come out of the pedal (effects or distortion) will be transmitted by analog jack connection to the D/I input on the front of the Chandler Limited Redd 47.

You can also fine-tune the sound gain optimally by accessing the “FINE GAIN SET” potentiometer. So, when scaling the gain, we will start by setting the “OUTPUT” potentiometer fully (from left to right), set “FINE GAIN SET” to zero, and adjust the gain little by little using the adjustment knob. “VOLTAGE GAIN dB” until the desired musicality is obtained.

The approximate audio input gain once obtained, we will adjust it via the “FINE GAIN SET” potentiometer to give a beautiful color to the sound . Note that a single Chandler Limited Redd 47 unit can provide up to 57 dB of gain thanks to good adjustment using the two “VOLTAGE GAIN” and “FINE GAIN SET” knobs.

Chandler Limited Redd 47 purchase
Chandler Limited Redd 47

AT THE LOWEST PRICE 👇

In Line Input or “D/I input” mode, you can start by setting the “VOLTAGE GAIN” to 16 , set “FINE GAIN SET” to zero and activate the PAD 20 dB switch . We can then adjust the “FINE GAIN SET” gradually until we obtain the desired color or sound imprint.

If you have to use it as an amplification stage with a channel strip like Manley Voxbox or a mixing desk, you will have to make sure to lower the main fader enough so as not to distort the sound at the Chandler input. Limited Redd 47.

In the same way as for other types of audio processing, we will start by increasing the “VOLTAGE GAIN”, returning the “FINE GAIN SET” to zero, and fine-tuning this filter until we obtain the desired sound. For the rest, you will just have to rely on your listening skills and leave it to the Chandler Limited Redd 47 to amplify the sound as it should.

Chandler Limited Redd 47 pro amplifier
Picture from Worthpoint.com

Technical characteristics of the Chandler Limited Redd 47 preamp

  • line amplifier.
  • EF86, E88CC).
  • 16 to 52 dB in 6 dB increments.
  • -5 dB to +5 dB in 1 dB increments.
  • +57 dPa.
  • 20 dB switchable.
  • +48 Volts switchable.
  • 120 Volts or 220 Volts.
Chandler Limited Redd 47 MIC AMPLIFIER
Picture from Proaudiola.com
Chandler Limited Redd 47 purchase
Our Overall Opinion

Overall Sound Quality

4,9 /5
4.9/5

Value for money

4,7 /5
4.7/5

Global mark

4,8 /5
4.8/5

Our opinion on the Chandler Limited Redd 47 preamplifier

Chandler Limited Redd 47 is the ideal choice of sound amplifier to provide more power to the sound and give it a beautiful color, to complement your studio and sound equipment. With or without a distortion pedal, your electric or electro-acoustic guitar will also obtain a beautiful vintage sound using this rare and legendary preamplifier.

Its handling remains more practical and simple compared to that of other audio amplifiers or a multichannel amplifier. However, the Chandler Limited Redd 47 meets the technical requirements of most current audio devices. Likewise, the audio quality it imparts is well above average compared to that of an ordinary transistor amp.

It can be used in conjunction with a vinyl record player, a mixing console, an external audio equalizer, a home cinema speaker or a powerful loudspeaker. Hi-fi. The stereo audio rendering will be even more personalized and colorful.

Additionally, the amp can fit perfectly in a rack, making it very convenient to use in amplifier stages with various other units, Tuner amps, modules, EQs and mixers. Likewise, the Chandler Limited Redd 47 is fully compatible with the vast majority of hi-fi devices and sound equipment from Cambridge audio.

One of the huge advantages of the Chandler Limited Redd 47 even lies in the possibility of combining it in series with a second Redd 47 preamp unit to offer an optimal and much more immersive listening experience in Stereo.

In addition to representing a sure value due to its rarity, this power amp constitutes an ingenious investment for any audiophile who wishes to quickly start a successful home studio project. So, we can only wish you a good and pleasant listening experience with this unique and legendary amp!

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