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)