Revox A77 MK4 | Freakuence!

Description

Description Freakuence!

The Real Real 2 Real classic! The Revox A77 MK4 with two tracks.

Details

Refreshed by Tom van der Hoff, the leading specialist.

No reels or tapes. Just as shown in the photos.

Shipping is pricey unfortunately, this is because we send this unit on a pallet instead of a regular package. To avoid parts going on the walk. We have learned by trial and error.

General description

The Revox A77 MK4 is a classic tape recorder known for its accurate reproduction and warm sound. This cassette-style analog recording device delivers a detailed stereo image with a clear sound presentation and strong dynamics. The Revox A77 MK4 brings out musical layers with subtle detail and a consistent soundstage, making it ideal for enthusiasts of tape playback and authentic recording equipment.

As a tape deck, the Revox A77 MK4 delivers reliable performance in listening rooms where quality matters. The sound of this Revox A77 MK4 preserves the natural tonality of instruments and vocals, without artificial coloration. The tuning of the stereo image and the balance between high and low frequencies ensures that the reproduction remains pure, with an organic sound that can approach a studio-like ambiance. Its dynamic range ensures that soft passages retain their spatial depth and that powerful sounds come through without distortion.

Would you like to hear how the Revox A77 MK4 sounds in a listening room or compare it to other recording devices? Please contact us to schedule a listening session or compare it with similar tape recorders. We’d also be happy to discuss trade-in options to see what’s possible.

Revox A77 MK4 Specifications

Number of Motors: 3 Number of Heads: 3 (Erase, Record, and Playback Heads) Track Configuration: 2-track Tape Speeds: 9.5 and 19 cm/s (19 and 38 cm/s for high-speed versions) Synchronization Variation at 9.5 cm/s: ±0.10% Synchronization Variation at 19 cm/s: ±0.08% Synchronization Variation at 38 cm/s: 62 dB (four-track) Signal-to-noise ratio at 9.5 cm/s: >63 dB (two-track) and >59 dB (four-track) Crosstalk attenuation at 1 kHz: more than 60 dB in mono mode and more than 45 dB in stereo mode Total harmonic distortion at 1000 Hz at 0 VU and 19/38 cm/s: less than 2% Total harmonic distortion at 1000 Hz at 9.5 cm/s: less than 3% Output voltage (line output): 2.5 V with a 600 Ω load Microphone input (Low): 0.15 mV, impedance between 50–600 Ω Microphone input (High): 2.5 mV, impedance approximately 100 kΩ Aux input: 35 mV, impedance approximately 1 MΩ Radio input: 2.5 mV at 33 kΩ Headphone output impedance: 200–600 Ω Maximum coil diameter: 26.5 cm Dimensions (WxHxD): 413 × 359 × 180 mm Weight: approximately 15.5 kg

Background information

The Revox A77 MK4 is an iconic tape recorder from the 1970s, designed with precision and craftsmanship. Developed under the leadership of engineers such as Willi Studer, the design focused on durability and audiophile sound quality. The cabinet is made of high-quality materials such as aluminum and wood, giving it a robust and elegant appearance. The internal wiring and components are of high quality and carefully selected to minimize noise and distortion. Production took place in Switzerland, with strict quality controls to ensure reliability. The A77 MK4 is still renowned for its reliability and outstanding performance.

Brand history

Revox was founded in 1948 by Willi Studer in Switzerland. The brand began its journey by manufacturing professional audio recording and playback equipment. In the 1950s, Revox introduced its first products, which helped it make a name for itself in the industry. Throughout its history, the company has developed a variety of devices, with an emphasis on quality and precision. This focus led to a solid reputation in the industry. Revox has applied various technologies and has been involved in the production of a wide range of products used in many applications worldwide. Over the years, Revox has remained true to its roots, with an ongoing commitment to technical craftsmanship and meticulous engineering. Throughout its long history, the brand has expanded while retaining its well-known characteristics and originality. Revox remains a recognizable and respected part of its industry.

Additional information

Merken	Revox
Kleur	Zwart

Questions & Answers

How can the belt tension be adjusted on the Revox A77 MK2?

The belt tension can be adjusted by changing the tension of the spring on the belt tensioner arm. Refer to the service manual for specific instructions.

What tape formats are compatible with the Revox A77 MK2?

The Revox A77 MK2 supports reels up to 26.5 cm (10.5 inches) and is compatible with both 2-track and 4-track tapes.

How do you clean the recording and playback head?

Use a cotton swab moistened with isopropyl alcohol to gently remove dirt and residue from the heads. Avoid using abrasive materials.

Can the Revox A77 MK2 be connected to an external amplifier?

Yes, the Revox A77 MK2 has line outputs that can be connected to an external amplifier via RCA or DIN connectors.

How is the belt speed adjusted?

The speed can be electronically adjusted between 9.5 cm/s and 19 cm/s using the speed selector switch on the front panel.

What equalization standards does the Revox A77 MK2 support?

The Revox A77 MK2 supports both NAB and IEC equalization, which can be selected using the equalization switch.

Is it possible to record live audio using microphones?

Yes, the Revox A77 MK2 has microphone inputs that are compatible with both high- and low-impedance microphones, making live recordings possible.

How is the tape run monitored during recording?

The Revox A77 MK2 is equipped with VU meters that indicate the recording and playback levels, allowing for precise control of tape speed.

What power supply is required for the Revox A77 MK2?

The Revox A77 MK2 consumes approximately 70 W and can be connected to standard AC voltages; check the specifications for compatibility with local voltages.

How should the Revox A77 MK2 be maintained to ensure optimal performance?

Regular cleaning of the heads and belt paths, as well as periodic checks of the belt tension and mechanical components, ensures optimal performance and extends the service life of the device.

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Features

CD player / turntable on pallet.

All about | Revox A77 MK4

Description Freakuence! | Revox A77 MK4

The Real Real 2 Real classic! The Revox A77 MK4 with two tracks.

Details | Revox A77 MK4

Refreshed by Tom van der Hoff, the leading specialist.

No reels or tapes. Just as shown in the photos.

Shipping is pricey unfortunately, this is because we send this unit on a pallet instead of a regular package. To avoid parts going on the walk. We have learned by trial and error.

General description | Revox A77 MK4

Revox A77 MK4 Specifications | Revox A77 MK4

Background information | Revox A77 MK4

Brand history | Revox A77 MK4

Questions & Answers | Revox A77 MK4

How can the belt tension be adjusted on the Revox A77 MK2?

The belt tension can be adjusted by changing the tension of the spring on the belt tensioner arm. Refer to the service manual for specific instructions.

What tape formats are compatible with the Revox A77 MK2?

The Revox A77 MK2 supports reels up to 26.5 cm (10.5 inches) and is compatible with both 2-track and 4-track tapes.

How do you clean the recording and playback head?

Use a cotton swab moistened with isopropyl alcohol to gently remove dirt and residue from the heads. Avoid using abrasive materials.

Can the Revox A77 MK2 be connected to an external amplifier?

Yes, the Revox A77 MK2 has line outputs that can be connected to an external amplifier via RCA or DIN connectors.

How is the belt speed adjusted?

The speed can be electronically adjusted between 9.5 cm/s and 19 cm/s using the speed selector switch on the front panel.

What equalization standards does the Revox A77 MK2 support?

The Revox A77 MK2 supports both NAB and IEC equalization, which can be selected using the equalization switch.

Is it possible to record live audio using microphones?

Yes, the Revox A77 MK2 has microphone inputs that are compatible with both high- and low-impedance microphones, making live recordings possible.

How is the tape run monitored during recording?

The Revox A77 MK2 is equipped with VU meters that indicate the recording and playback levels, allowing for precise control of tape speed.

What power supply is required for the Revox A77 MK2?

The Revox A77 MK2 consumes approximately 70 W and can be connected to standard AC voltages; check the specifications for compatibility with local voltages.

How should the Revox A77 MK2 be maintained to ensure optimal performance?

Regular cleaning of the heads and belt paths, as well as periodic checks of the belt tension and mechanical components, ensures optimal performance and extends the service life of the device.

Reviews & awards | Revox A77 MK4

Stereophile.com

rates the Revox A77 as a tape recorder with excellent speed control, minimal wow and flutter, very low noise, and an exceptionally wide frequency response. The portable version, with built-in monitor amplifiers and speakers, is compact and easy to transport. One point of criticism is the use of three-pin jacks for microphone inputs instead of the XLR connectors commonly used in the U.S. In addition, deviations in the high-frequency response were observed in three of the units tested, indicating an inaccurate calibration.

The Absolute Sound

describes the experience of restoring a Revox A77 Mark IV. After years of disuse, the tape recorder was overhauled, which included repairing the power supply and replacing worn-out parts. The author emphasizes the importance of regular maintenance and the availability of specialized repair services to maintain the A77’s performance.

Revox Service

reports that the Revox A77 outperforms its predecessor, the G-36 Mk III. With all-solid-state electronics, a bias oscillator frequency of 120 kHz, and a new electronic motor speed control, the A77 offers excellent frequency response and signal-to-noise ratio. The transport mechanisms operate smoothly and quietly, with minimal wow and flutter. Criticisms include the lack of a pause button and a tape loading path that makes threading the tape difficult.

Galaxus

highlights the nostalgic appeal of the Revox A77 and its warm, analog sound quality. However, performance can vary due to factors such as contamination of the tape heads or the use of less suitable tapes. Despite the A77’s reliability compared to other tape recorders, the device is described as a “capricious diva” that requires careful maintenance.

Amazona.de

shares the experience of a musician who uses the Revox A77 for recording. After some initial caution when setting the recording levels, the author discovered that driving the inputs at a higher level resulted in pleasant tape saturation without unwanted distortion. Maintaining the A77—such as cleaning and demagnetizing it—is considered time-consuming, but the sound quality and the recording process are regarded as highly satisfying.

Revox A77 MK2

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