ReVox B791 (1981) | Linatrack

 

Revox introduced it's original Linatrack (Linear tracking/Tangential tonearm) model, the B790 in 1977. The B791 presented here is the updated version that was introduced in 1981. The pivoting REVOX tonearm concept with the tangential short tonearm represents a successful synthesis of technical innovation and constructive perfection. Damage to the record and scanning system as well as strength and resonance problems of conventional tubular tonearms are a thing of the past with this design. An electronically controlled tracking system keeps the pickup exactly in the middle of the record groove so that no playback distortion occurs. The flat motor developed and built by REVOX is quartz-controlled and drives the turntable directly. This ensures the synchronous consistency absolutely necessary for distortion-free playback without the need for readjustment, even when using record cleaning devices. The digitally displayed rotation speed of the turntable on the B791 can be quartz-controlled by ± 9.9% in steps of 0.1%. The sound variations that can be achieved in this way enable record lovers to create an extraordinarily nuanced playback and adapt it to their individual musical sensibilities. In addition, there is also the possibility of tuning the pitch to a musical instrument or audio-visual device in the simplest way possible.

Technical data:

Motor: Quartz Direct Drive

Speed accuracy: +/-0,01%

Platter diameter 313mm, weight 2,1kg

Tonearm: Linatrack with servo-electronic tracking

Dimensions (WxHxD): 449x142x395mm

Weight: 9,1kg

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PIONEER RT-701 (1976)

 

Pioneer's open reel deck, the RT-701 was introduced in 1976. In addition to improving sound quality, the design is made to be compatible with the amplifiers and tuners that are the core of the component system, and it can be mounted in an EIA standard rack. It features a unique design, and is equipped with a direct drive system in which the motor shaft itself acts as a capstan, a newly developed hard permalloy head, and other features that have been thoroughly improved in terms of performance and sound quality. The RT-701 uses hard permalloy material for the recording and playback heads. The surface is precisely polished to a mirror finish, so it changes little over time even with long-term use and maintains excellent recording and playback characteristics. The head amplifier also uses an equalizer amplifier that uses a newly developed IC with high input resistance and low noise. The RT-701 is a high quality 4-track 2-channel stereo recorder that can operate at two speeds: 19cm/s and 9,5cm/s. Original sale price was 1.480 DM in Germany. There was also a RT-701S without the rack mounting front panel ears. Later this model was upgraded as the RT-707, an auto-reverse model. Frequency response 20-28.000Hz (19cm/s) | Wow and Flutter: 0,05% (WRMS) | 3-motor Direct Drive system | Size (WxHxD) 480x230x356mm | Weight: 19,5kg

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PHILIPS F9434 (1983) | Dynamic Response Control

 

The F9434 was introduced by Philips in 1983. Following the trends of the moment this loudspeaker uses flat membrane speakers. These are still cone-type drive units but the cone is coupled to a rigid plane mounted perpendicular to the drive coil. The membrane is coupled to the cone at its nodal radius (the point of zero displacement under any resonant condition) and this ensures that the entire surface of the membrane responds uniformly to the drive at all frequencies and amplitudes. For extended bass performance the F9434 also utilizez a DRM - Dynamic Bass Processor. This passive membrane works in phase with the active woofer and covers the low frequency range between 30 and 100Hz. For brilliant transient reproduction and high power handling the tweeter is a Isophase tweeter. This is a wafer-thin Capton membrane (10x thinner than a human hair) in which the voice coil is incorporated. Power rating is 80 W Nominal/140W Music power | Frequency response: 30-40.000Hz | Impedance 8ohm | Size: 740x270x290mm | Weight: 14,8kg.

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