Revox B 791 turntable

 

With the B791 (and B795) turntables, tangential tracking has been brought to the point of perfection. While conventional reproduction systems offer good compromises, Revox solves some problems that were once thought unsolvable. Disadvantages resulting from the opposing physical forces inherent in disc reproduction have been overcome by significant engineering breakthroughs. New solutions have made Revox the leader in turntable technology.

Pivoting Tonearm Module

The revox concept of a pivoting tonearm module, together with the ultra-short tangential tonearm, represents a successful synthesis of technical innovation and mechanical perfection. In this exclusive design the usual resonance problems of tubular tonearms have been eliminated and the threat of damage to either disc or cartridge stylus has become a thing of the past.

An electronic servo control keeps the stylus tracking precisely in the center of the record groove, thus avoiding playback distortions. Record warps and eccentricities are no problem. The result is a light, delicate tracking of your valuable discs from the first groove to the last.

 

Quartz-Crystal for Constant Speed

Developed and manufactured by Revox, the B791 (and B795) motor is Quartz controlled and drives the plater directly. Therefore,, use of a constant dust-removing device will not alter the locked-in speed. On the B791 the speed can be changed from -9,9% to +9,9% in precise o,1% steps, with a digital display showing the Variation. This allows the audiophile to obtain unlimited nuances for special effects, and also facilitates quick tuning of a record to a musical instrument.

 

Changing Cartridges

With Revox turntables you are not limited to the use of one cartridge. Four premium cartridges are available, factory installed and optimally adjusted. Of course you can also install practically any other cartridge that follows the international mounting norms.

 

Advanced Technology, Simple Operation

Ease of operation is practically a revox trademark, and here it begins with automatic cleaning of the stylus tip. A built-in light aids in finding specifica musical selections. All functions are activated by front panel buttons which may be operated even with the dust cover closed. With the development of the B791 (and B795), revox is once again leading the way. Precision, advanced technology, long-term reliability, and intelligent design are hallmarks of superiority.

 

Automatic Functions:

When swinging in the tone arm support - Platter starts to rotate at preselected speed

When swinging out the tone arm support - Cartridge lifts off immediately; Cartridge returns to start position; Platter stops, stylus illumination switches off

Operating

Platter Drive :  Power Switch; Two tactile feedback keys for selection speeds

Carriage:  Three tactile feedback keys for fast inward and outward movement as well as lifting and lowering the cartridge; built-in cartridge illumination

Speed:  Two tactile feedback keys for increasing or decreasing the platter speed.

Display:  5-Digit display for nominal speed and deviation in percent

Specifications:

Platter Drive:  Quartz- controlled direct drive system

Platter Speeds:  33 and 45 RPM

Speed Adjust. Range:  ±09,9%, quartz accurate

Speed Stability:  ±0,01%

Speed Indications:  Speed and synchro indicator (33 and 45 RPM)

Platter:

Diameter :  313 mm (12,32")

Weight :  2,1 kg (4 lbs 10 oz)

Acceleration Time:  less than 2 sec. to 33 RPM

Deceleration Time:  less than 2 sec. from 45 to 33 RPM

Wow and Flutter:

Weighted :  better than 0,05%

Linear :  better than 0,1%

Rumble (Unweighted):  better than -50 dB (DIN 45539A)

Rumble (Unweigted with 20 Hz high-pass:  better than -52 dB (DIN 45539A)

Rumble (Weighted):  better than -72 dB (DIN 45539B)

Tone-arm:

Linear-tracking tone arm with servoelectronic follow-up control

Tangential Tracking Error:  smaller than 0,5°

Skating Compensation:  Not required with a tangentially tracking system

Stylus Force:  Adjustable with balance weight from 8 to 20 mN (0,8 to 2 p)

Tone-arm Lowering:  Electronically controlled, pneumatically damped

Muting:  Electronic muting until stylus contacts record (approx. 1 s)

Tone-arm Follow-up:  Optoelectronic sensing with LED as light source; servoelectronics an DC motor

Run-out Switch:  Automatically activated by servoelectronics

General

Semiconductors Components:  31 ICs, 46 Transistors; 45 Diodes; 4 LEDs; 2 Bridge rectifiers; 5 seven-segment displays

Power Requirements:  100/110/120 V 200/220/240 V ; 50/60 Hz

Power Consumption:  30 W max

Power Fuse

0,4 A (slow-blow) :  100 - 120 V

0,2 A (slow-blow) :  200 - 240 V

Dimensions (W x H x D):  449 x 142 x 395 mm (17,7" x 5,5" x 15,6")

Weight:  9,1 kg (20 lbs)