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Quad 66 PRE

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Description

Description: Freakuence!
It’s great to have this back in the shop. This Quad 66 PRE sounds remarkably smooth in the midrange, as if the vocals have no harsh edges and the background instruments blend softly together.
Details
For any damage, please see the photos!
No worries! We offer an excellent 12-month warranty on used products.
General description
The Quad 66 PRE is a classic preamplifier from Quad, known for its transparent sound and refined stereo image. This Quad 66 PRE offers excellent detail reproduction and a spacious soundstage, with dynamics that do justice to both subtle pianoforte passages and powerful pieces. As a preamp, the Quad 66 PRE brings a clear sonic signature to any audio setup, while maintaining a natural tonal balance and allowing the music to breathe.
Used as a preamplifier, this Quad 66 PRE delivers a listening experience in which nuance and atmosphere are clearly distinguishable. The Quad 66 PRE’s sound reproduction brings instruments and vocals close to the listener, with a natural sound quality characteristic of high-end audio equipment. The transparency of the Quad 66 PRE allows you to hear subtle textures in recordings, making the soundstage richer in nuance without losing clarity.
Curious to see how the Quad 66 PRE performs in your setup? Schedule a listening session to experience the difference in detail and sound for yourself. You can also find out how the Quad 66 PRE compares to other preamps or discuss what you’d get in exchange for this Quad 66 PRE.
Quad 66 PRE Specifications
Number of Inputs: seven Input Sensitivity (Disc, MM): 3 mV / 47 kΩ / 220 pF Line Input Sensitivity: 300 mV / 100 kΩ Radio Input Sensitivity: 100 mV / 100 kΩ A-V & Aux 1 (anti-hum) Input Sensitivity: 300 mV / 33 kΩ Input Sensitivity Aux 2 & Tape: 300 mV / 100 kΩ
Noise Figures: Disc (MM) ≈ 75 dB at Vol Max; Line ≈ 99 dB at Vol Max Signal-to-Noise Ratio at Vol-23: Disc ≈ 90 dB; Line ≈ 105 dB
Amplifier Output Level: 500 mV / 940 Ω (with peak level ±1.5 V) Tape / Aux 2 Record Output: 300 mV / 3.3 kΩ
Maximum total harmonic distortion (THD) across all inputs: 0.05%
Residual noise at minimum volume control: −105 dB (A-weighted)
Frequency response, line inputs (non-Disc): ±0.2 dB from 15 Hz to 20 kHz Frequency response, Disc input (RIAA): flat within ±0.5 dB from 30 Hz to 20 kHz
Inter-channel balance: ±0.5 dB across volume settings from max to −60 dB
Channel separation: greater than 75 dB from 20 Hz to 20 kHz
Adjustable mains voltage: 110–120 V or 220–240 V AC (switchable via circuit board)
Power consumption: approximately 12 W
Fuse: 125 mA for 220–240 V; 250 mA for 110–120 V
Dimensions (W x H x D): 321 mm × 80 mm × 255 mm
Weight: 3.3 kg
Background Information
The Quad 66 PRE is a preamplifier known for its innovative design philosophy and outstanding sound quality. Developed with a focus on minimalism and functionality, the 66 PRE uses high-quality components that have been carefully selected to minimize distortion. The internal wiring is optimized for a short signal path, resulting in a clear sound reproduction. The chassis is sturdy and aesthetically designed, with attention to both form and function. Although specific engineers are not always named, the influence of Peter Walker, Quad’s founder, is evident in the design and manufacturing methods. Quad is known for its commitment to quality and durability, with materials often sourced locally.
Brand history
Quad was founded in 1936 by Peter Walker in England. The company introduced its first loudspeaker, the “Corner Ribbon,” in 1949. This loudspeaker used a ribbon technology to produce high frequencies, which provided clear reproduction of treble. In the 1950s, Quad introduced the Electrostatic Loudspeaker (ESL), which was a milestone in the development of loudspeaker technology. The ESL was known for its full-range electrostatic technology, which provided unprecedented natural sound.

Quad has since released several models and series, including the Z Series. This model uses a specially designed sandwich construction in the ribbon tweeters for higher sensitivity and accuracy. The brand continues to develop its products while staying true to Peter Walker’s original philosophy of staying as close to the original sound as possible.

Additional information

Merken

Kleur

Questions & Answers

Does the Quad 66 Pre have a built-in phono preamp for moving-magnet turntables?

Yes, the Disc input includes a module compatible with most moving-magnet cartridges, with a ground connection available for the turntable.

How are volume and balance controlled on the Quad 66 Pre?

This is done using the rotary knobs on the remote control: one for volume and one for balance, with no controls on the main unit itself.

What connections are available to the amplifier?

The preamplifier’s output is 0.5 volts, suitable for transistor amplifiers; the signal connectors are phono (RCA) jacks.

How many inputs are there, and what types of sources can be connected?

There are seven inputs: Disc, CD, Radio, A-V, Aux1, Aux2, and Tape, with tape monitoring and an anti-hum circuit for A-V and Aux1.

Is there a standby function to turn everything off with a single button?

Yes, the Quad 66 Pre can be put into standby mode using the remote control, which also turns off any devices connected to the AC auxiliary outlet.

Can the control panel operate without a battery?

Yes, if the control panel’s battery is dead, it can be powered directly through the DC power socket on the front of the preamp.

Does the Quad 66 Pre support control of an external CD player?

Yes, the control panel can control CD players that use the RC-5 infrared code, in addition to Quad’s own CD players.

What frequency response and distortion can be expected from the various inputs?

For all inputs except Disc, the frequency response is ±0.3 dB from 15 Hz to 20 kHz; for Disc, the RIAA response is flat within 0.5 dB from 30 Hz to 20 kHz; distortion is a maximum of 0.05% in the worst-case scenario.

Can the Quad 66 Pre have separate modules for Disc inputs?

Yes, the Disc input is modular: other modules are available if a different phono specification is desired.

What filters and tone controls are available, and how do you adjust them?

There are separate buttons for Tilt, Bass Step, and two filters; these are adjusted using the remote control, each with two settings.
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Features

i

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i

For details on any damage, please see the photos!

Minor damage

All about | Quad 66 PRE

Description: Freakuence! | Quad 66 PRE

It’s great to have this back in the shop. This Quad 66 PRE sounds remarkably smooth in the midrange, as if the vocals have no harsh edges and the background instruments blend softly together.

Details | Quad 66 PRE

For any damage, please see the photos!
No worries! We offer an excellent 12-month warranty on used products.

General description | Quad 66 PRE

The Quad 66 PRE is a classic preamplifier from Quad, known for its transparent sound and refined stereo image. This Quad 66 PRE offers excellent detail reproduction and a spacious soundstage, with dynamics that do justice to both subtle pianoforte passages and powerful pieces. As a preamp, the Quad 66 PRE brings a clear sonic signature to any audio setup, while maintaining a natural tonal balance and allowing the music to breathe.
Used as a preamplifier, this Quad 66 PRE delivers a listening experience in which nuance and atmosphere are clearly distinguishable. The Quad 66 PRE’s sound reproduction brings instruments and vocals close to the listener, with a natural sound quality characteristic of high-end audio equipment. The transparency of the Quad 66 PRE allows you to hear subtle textures in recordings, making the soundstage richer in nuance without losing clarity.
Curious to see how the Quad 66 PRE performs in your setup? Schedule a listening session to experience the difference in detail and sound for yourself. You can also find out how the Quad 66 PRE compares to other preamps or discuss what you’d get in exchange for this Quad 66 PRE.

Quad 66 PRE Specifications | Quad 66 PRE

Number of Inputs: seven Input Sensitivity (Disc, MM): 3 mV / 47 kΩ / 220 pF Line Input Sensitivity: 300 mV / 100 kΩ Radio Input Sensitivity: 100 mV / 100 kΩ A-V & Aux 1 (anti-hum) Input Sensitivity: 300 mV / 33 kΩ Input Sensitivity Aux 2 & Tape: 300 mV / 100 kΩ
Noise Figures: Disc (MM) ≈ 75 dB at Vol Max; Line ≈ 99 dB at Vol Max Signal-to-Noise Ratio at Vol-23: Disc ≈ 90 dB; Line ≈ 105 dB
Amplifier Output Level: 500 mV / 940 Ω (with peak level ±1.5 V) Tape / Aux 2 Record Output: 300 mV / 3.3 kΩ
Maximum total harmonic distortion (THD) across all inputs: 0.05%
Residual noise at minimum volume control: −105 dB (A-weighted)
Frequency response, line inputs (non-Disc): ±0.2 dB from 15 Hz to 20 kHz Frequency response, Disc input (RIAA): flat within ±0.5 dB from 30 Hz to 20 kHz
Inter-channel balance: ±0.5 dB across volume settings from max to −60 dB
Channel separation: greater than 75 dB from 20 Hz to 20 kHz
Adjustable mains voltage: 110–120 V or 220–240 V AC (switchable via circuit board)
Power consumption: approximately 12 W
Fuse: 125 mA for 220–240 V; 250 mA for 110–120 V
Dimensions (W x H x D): 321 mm × 80 mm × 255 mm
Weight: 3.3 kg

Background Information | Quad 66 PRE

The Quad 66 PRE is a preamplifier known for its innovative design philosophy and outstanding sound quality. Developed with a focus on minimalism and functionality, the 66 PRE uses high-quality components that have been carefully selected to minimize distortion. The internal wiring is optimized for a short signal path, resulting in a clear sound reproduction. The chassis is sturdy and aesthetically designed, with attention to both form and function. Although specific engineers are not always named, the influence of Peter Walker, Quad’s founder, is evident in the design and manufacturing methods. Quad is known for its commitment to quality and durability, with materials often sourced locally.

Brand history | Quad 66 PRE

Quad was founded in 1936 by Peter Walker in England. The company introduced its first loudspeaker, the "Corner Ribbon," in 1949. This loudspeaker used a ribbon technology to produce high frequencies, which provided clear reproduction of treble. In the 1950s, Quad introduced the Electrostatic Loudspeaker (ESL), which was a milestone in the development of loudspeaker technology. The ESL was known for its full-range electrostatic technology, which provided unprecedented natural sound.

Quad has since released several models and series, including the Z Series. This model uses a specially designed sandwich construction in the ribbon tweeters for higher sensitivity and accuracy. The brand continues to develop its products while staying true to Peter Walker's original philosophy of staying as close to the original sound as possible.

Questions & Answers | Quad 66 PRE

Does the Quad 66 Pre have a built-in phono preamp for moving-magnet turntables?


Yes, the Disc input includes a module compatible with most moving-magnet cartridges, with a ground connection available for the turntable.

How are volume and balance controlled on the Quad 66 Pre?


This is done using the rotary knobs on the remote control: one for volume and one for balance, with no controls on the main unit itself.

What connections are available to the amplifier?


The preamplifier's output is 0.5 volts, suitable for transistor amplifiers; the signal connectors are phono (RCA) jacks.

How many inputs are there, and what types of sources can be connected?


There are seven inputs: Disc, CD, Radio, A-V, Aux1, Aux2, and Tape, with tape monitoring and an anti-hum circuit for A-V and Aux1.

Is there a standby function to turn everything off with a single button?


Yes, the Quad 66 Pre can be put into standby mode using the remote control, which also turns off any devices connected to the AC auxiliary outlet.

Can the control panel operate without a battery?


Yes, if the control panel’s battery is dead, it can be powered directly through the DC power socket on the front of the preamp.

Does the Quad 66 Pre support control of an external CD player?


Yes, the control panel can control CD players that use the RC-5 infrared code, in addition to Quad’s own CD players.

What frequency response and distortion can be expected from the various inputs?


For all inputs except Disc, the frequency response is ±0.3 dB from 15 Hz to 20 kHz; for Disc, the RIAA response is flat within 0.5 dB from 30 Hz to 20 kHz; distortion is a maximum of 0.05% in the worst-case scenario.

Can the Quad 66 Pre have separate modules for Disc inputs?


Yes, the Disc input is modular: other modules are available if a different phono specification is desired.

What filters and tone controls are available, and how do you adjust them?


There are separate buttons for Tilt, Bass Step, and two filters; these are adjusted using the remote control, each with two settings.

Reviews & awards | Quad 66 PRE

Hi-Fi Choice (Nov. 1993)

: This summary covers the combined review of the Quad 66 preamp and the Quad 606 power amp; the sound quality is described as typically “Quad-like”: refined, smooth, and undemanding in terms of balance; genres such as pop and jazz sound confident, but lack “bite” or excitement. Classical music loses some of its dynamics and transparency, resulting in a predictable and safe sound that lacks color. Technical performance is mixed: very low distortion and excellent channel balance, but a limited main level at the disc input and a weak 1.7 V pre-output.

Ters Audio (Review “Quad 66 and Quad 606 review”)

: This confirms Hi-Fi Choice’s assessment; the combination never comes across as legendary, but it is reliable. The sound is described as “soft and forgiving,” with less pronounced expression in vocals, strings, and percussion. Quad’s after-sales service and reliability have been highly praised.

Hi-Fi News & Record Review (Dec 1993)

: The Quad 66 preamplifier proved to be only slightly “intrusive” when compared to passive reference units; transparency and stereo imaging are described as respectable. The 606 amplifier, on the other hand, lacked some clarity in the treble due to high-frequency distortion; its response to interconnects and power load is also critical.

OpusKlassiek (Dutch review)

: The Quad 66 preamp is praised for its extensive tone control—featuring tilt control, filter settings, and bass step. These controls do not distort the musical foundation, offering flexibility without compromising musical balance; vocals are reproduced clearly, and the low end remains deep without excessive amplification. Ease of installation in recording facilities and user-friendliness are cited as advantages, as is the quality of the hardware.

Features | Quad 66 PRE

i
Don't worry! We offer an excellent 12-month warranty on used products.
Warranty
i
For details on any damage, please see the photos!
Minor damage

CD

The Compact Disc (CD), like most inventions, did not appear out of thin air. After the invention of the laser in 1958, the first patent for optically readable disks was filed in 1961. The first digital video records were introduced in 1972. After a flop by Philips, the manufacturer, together with Sony, released the first CD in 1979. We do not know what it contained, but in 1982 the first CD was released for the market, it was the album Visitors by ABBA. In this year the first player became available and so began the elimination of the LP from the market. Many have literally thrown their LPs in the trash… we still see some visitors being disappointed when they tell us this. Velen hebben hun lp’s letterlijk bij het vuil gezet… sommige bezoekers zien wij nog steeds balen als ze dit vertellen.

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CD

The Compact Disc (CD), like most inventions, did not appear out of thin air. After the invention of the laser in 1958, the first patent for optically readable disks was filed in 1961. The first digital video records were introduced in 1972. After a flop by Philips, the manufacturer, together with Sony, released the first CD in 1979. We do not know what it contained, but in 1982 the first CD was released for the market, it was the album Visitors by ABBA. In this year the first player became available and so began the elimination of the LP from the market. Many have literally thrown their LPs in the trash… we still see some visitors being disappointed when they tell us this. Velen hebben hun lp’s letterlijk bij het vuil gezet… sommige bezoekers zien wij nog steeds balen als ze dit vertellen.
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