Revox A 76

A76 Revox Builds the tuner of the future.

The conventional design concepts for tuners are not satisfactory any more if one wants to reach the optimum in freedom from distortion and signal interference. Therefore, Revox have tossed overboard traditional ideas and by designing the "third generation tuner" they have  a whole leap forward.

The approach  has been thoroughly professional and without compromise. The input section features "dual gate" field effect transistors and quadruple variable capacitor tuning, while the IF-strip consists of a passive Gauss Filter, followed by an amplifier which is made up entirely of integrated Circuits (bandwidth 5 MHz). delay-lines are employed for demodulation without deteriorating the five megahertz bandwidth. A76 khz oscillator runs phase-locked to the subcarrier and supplies  after binary scaling the switching frequency to the stereo demodulator. Supplementary circuits permit silent tuning and effect automatic stereo changeover, they triogger a visual signal in th ecase of multipath reception and provide for th eindication of signal strength, centre tuning and the presence of a Stereo modulated carrier. To describe the distortion and noise free performance of  this tuner is virtually impossible.

Special Features:

Antenna Inputs:  60 ohms unbalanced (BNC); 240 ohms balanced (DIN)

RF-Input circuit with 2 MOS-FET and 4-section variable air - capacitor

Passiv gauss IF - Filter

Wideband IF - amplifier with 5 integrated circuits

Delay-line demodulator

Subcarrier regeneration with "phase locked loop" oscillator

Separate subcarrier demodulation with subsequent matrixing

Automatic stereo-mono selection

Silent tuning

Meters for Fieldstrength and Centre tuning indication

Stereo indicator light

Multipath warning light

Specifications

Tuning Range:  87,5 - 108 MHz

Sensitivity (60 Ω, 30 dB S/N, deviation 15 kHz):  1 µV

Static Selectivity 9at 300 kHz separation):  60 dB

Operational Selectivity (for two signals 100 µV and 1 mV, 40 kHz dev.at 1 kHz, 300 kHz separation):  80 dB

Spurious Response:  90 dB

Image Response:  70 dB

Bandwidth:

 IF Filter:  130 kHz

IF Ampl. And Demodulator :  5 MHz

Capture ratio:  1 dB

Pulse Noise Rejection (signal 100 µV and 1 mV peak per 100 kHz pulse noise, 75 kHz deviation):  40 dB

Distortion (40 kHz deviation at 1 kHz):  0,2%

Signal-to-Noise Ratio (unweighted, 75 kHz deviation):  70 dB

Stereo Separation:  40 dB 91 kHz)

Pilot Signal and Subcarrier Suppression: 40 dB

Audio Output (75 kHz deviation; adjustable, low internal impedance):  1 V

Frequency Response:  30 Hz - 15 kHz, -1 dB

Deemphasis:  50 µs

Semiconductor Complement:

Dual Insulated-gate FET :  2

Intergated Circuits :  6

Silicon Transistors :  41

Diodes :  27

Silicon Rectifiers :  2

Power Supply:  110, 130, 150, 220, 240, 250 V, 50/60 Hz

Power Consumption:  20 W

Dimensions (W x H x D):  415 x 160 x 245 mm

Weight:  7,8 kg (17,5 lbs)