The Sony STR-VX10L is an FM Stereo/FM-AM Receiver designed for high-fidelity audio reproduction. This receiver incorporates a PLL quartz-locked digital synthesizer system for precise tuning and a low-noise NF type equalizer amplifier in its preamplifier section, ensuring clear and accurate sound. The power amplifier section utilizes a quasi-complementary SEPP design.
Function Description:
The STR-VX10L serves as the central hub for an audio system, allowing users to tune into FM and AM radio broadcasts, connect various audio sources like record players, tape recorders, and other auxiliary devices, and drive two pairs of speaker systems (A and B). It features controls for volume, balance, bass, treble, and loudness, enabling users to tailor the sound to their preferences and listening environment. The receiver also includes a TAPE MONITOR switch for monitoring taped programs.
Important Technical Specifications:
Amplifier Section:
- Continuous RMS power output (both channels driven simultaneously):
- At 20 Hz-20 kHz: 20 + 20 watts (0.08% THD, 8 ohms)
- According to DIN 45500: 25 + 25 watts (8 ohms)
- At 1 kHz: 34 + 34 watts (5% THD, 8 ohms)
- Dynamic headroom: 1.4 dB ('78 IHF)
- Harmonic distortion: Less than 0.08% at rated output
- Intermodulation (IM) distortion (60 Hz: 7 kHz = 4:1): Less than 0.08% at rated output
- Frequency response:
- PHONO: RIAA equalization curve ±0.5 dB
- CD/AUX, TAPE: 10 Hz - 50 kHz ±3 dB
- Residual noise: Less than 200 µV (8 ohms, network A)
- Damping factor: 30 (8 ohms, 1 kHz)
- Inputs:
- PHONO: Sensitivity 2.5 mV, Impedance 50 kΩ, Maximum input capability (1 kHz) 150 mV, S/N (weighting network, input level) 74 dB (A, 2.5 mV)
- CD/AUX, TAPE: Sensitivity 150 mV, Impedance 50 kΩ, S/N (weighting network, input level) 90 dB (A, 150 mV)
- Outputs:
- REC OUT: Voltage 150 mV, Impedance 10 k ohms
- SPEAKER A, B: Accepts speakers of 8 to 16 ohms.
- HEADPHONES: Accepts low and high impedance headphones.
- Tone controls:
- BASS: ±8 dB at 100 Hz
- TREBLE: ±8 dB at 10 kHz
- Loudness (att. 30 dB): + 8 dB at 100 Hz
FM Tuner Section:
- Tuning range: 87.5 MHz - 108 MHz
- Antenna terminal: 75 ohms, unbalanced; 300 ohms, balanced
- Intermediate frequency: 10.7 MHz
- Sensitivity at 46 dB quieting (40 kHz deviation): 4.5 µV (mono), 45 µV (stereo)
- Usable sensitivity: 1.7 µV (S/N = 26 dB, 40 kHz deviation), 11.2 dBf, 2 µV (IHF)
- Signal-to-noise ratio (40 kHz deviation): 70 dB (mono), 65 dB (stereo)
- Harmonic distortion (40 kHz deviation): 0.2% (mono), 0.3% (stereo) at 1 kHz
- IM distortion (40 kHz deviation): 0.2% (mono), 0.3% (stereo)
- Separation: 45 dB at 1 kHz
- Frequency response: 44 Hz - 12.5 kHz ±0.5 dB
- Selectivity: 60 dB at 300 kHz
- Capture ratio: 1.5 dB
- AM suppression ratio: 48 dB
- Image response ratio: 45 dB
- IF response ratio: 90 dB
- Spurious response ratio: 70 dB
- RF intermodulation: 60 dB (IHF)
- Auto-tuning threshold: Approx. 45 dBf
MW/LW Tuner Section:
- Tuning range: MW: 522 kHz - 1,602 kHz; LW: 153 kHz - 344 kHz
- Antenna: Ferrite-bar antenna (provided), External antenna terminal (provided)
- Intermediate frequency: 450 kHz
- Usable sensitivity:
- MW: Ferrite-bar antenna 300 µV/m (at 1,000 kHz), External antenna 100 µV (at 1,000 kHz)
- LW: Ferrite-bar antenna 500 µV/m (at 230 kHz), External antenna 100 µV (at 230 kHz)
- Signal-to-noise ratio: 54 dB
- Harmonic distortion: 0.3%
- Selectivity: 35 dB (9 kHz)
General:
- Power requirements:
- Type 1 (for Continental European countries): 220 V ac (or 240 V ac adjustable by authorized Sony personnel), 50 Hz
- Type 2 (for United Kingdom): 240 V ac, 50 Hz
- Memory back-up power: 3 V dc, two batteries, IEC designation R6 (size AA)
- Battery life: Approx. 1 year with Sony SUM-3(NS) New Super Batteries
- Power consumption: 75 watts
- AC outlets: 2 switched total 100 watts
- Dimensions: Approx. 430 x 105 x 300 mm (w/h/d) (17 x 4 1/8 x 11 7/8 inches) including projecting parts and controls
- Weight: Approx. 6.3 kg (13 lbs 14 oz) net; Approx. 7.6 kg (16 lbs 12 oz) in shipping carton
- Accessories supplied: FM ribbon antenna (1), Station label (1 set), Sony SUM-3 (NS) New Super Batteries (2)
Usage Features:
- Direct Access Tuning: Allows users to directly input the desired frequency using numerical buttons.
- Automatic Tuning (FM reception): Scans frequencies in 0.05 MHz steps for automatic station finding.
- Memory Preset Tuning: Up to eight FM or MW/LW stations can be memorized for quick recall. The "0" indicator on the display blinks when the memory circuit is ready for storing data.
- Function/Frequency Display: A clear display shows the frequency being received, the preset tuning button number, and the program in use (e.g., PHONO).
- Station Index Windows: Provided for placing station labels to identify memorized stations.
- FM Mode Switch: Allows switching between stereo and mono reception, useful for weak or noisy FM stations.
- LOUDNESS Switch: Compensates for the human ear's decreased response to very low and high frequencies at low volume levels, providing a more uniform sound.
- TAPE MONITOR Switch: Enables listening to a taped program from a connected tape recorder.
- Speaker System Selection: Supports two pairs of speakers (A and B), which can be selected individually or simultaneously.
- Headphones Jack: For private listening with stereo headphones.
- AC Outlets: Two switched outlets (total 100 watts) are available for connecting other audio components, controlled by the receiver's POWER switch.
- Memory of Last Received Station: The receiver remembers the last station received for more than one second before power-off, automatically tuning to it when powered on again. This feature is useful for timer-activated recording.
Maintenance Features:
- Battery Installation for Memory Back-up: Two AA-size batteries (Sony SUM-3(NS) New Super Batteries recommended) are installed in a compartment at the rear to retain memorized frequencies when the receiver is turned off. Battery life is approximately one year.
- Battery Replacement Procedure: Users are instructed to turn on the receiver before installing or replacing batteries to avoid incorrect figures on the display. If incorrect figures appear, a specific procedure involving leaving the unit off, turning it on, installing batteries, and re-memorizing frequencies is provided.
- Cleaning: The cabinet, front, and rear panels can be cleaned with a soft cloth lightly dampened with a mild detergent solution. Solvents like alcohol, benzine, or thinner should not be used.
- Trouble Checks: A comprehensive list of common problems and their solutions is provided, covering issues like no audio, flickering stereo indicator, incorrect tuning, hum or noise, and rustling noise. This includes checking connections, adjusting controls, and ensuring proper antenna setup.
- Antenna Installation Guidelines: Detailed instructions for connecting 75-ohm coaxial cable and 300-ohm twinlead FM antennas, as well as MW/LW antennas. Recommendations for optimal antenna placement and type (ribbon dipole, helical, multi-element) are given to minimize interference and maximize signal reception.
- Ground Connection: Recommended for outdoor antennas to provide lightning protection and to prevent hum by connecting the ground terminal to a good earth ground.
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