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SONY STR-7025

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Technic details

Specifications

Type:
All silicon transistor FM / AM stereo receiver
Circuit system:
Power amplifier 2 power supply
Direct coupling pure complementary SEPP circuit
AM tuner section:
Reception frequency - 530kHz to 1605kHz
Intermediate frequency - 455kHz
Sensitivity - 48dB / m (When using bar antenna) / 30μV (When using external antenna)
S / N Ratio - 50dB
Image disturbance ratio - 56dB (1000kHz)
IF interference ratio - 40dB (1000kHz)
Distortion - 0.8%
Antenna – Ferrite-bar antenna / External antenna terminal

FM tuner section:
Reception frequency - 76MHz to 90MHz
Sensitivity - 2.2μV (IHF) / 1.7μV (S / N 30dB)
S / N ratio - 68dB
Capture ratio - 1.5dB
Selectivity (IHF) - 60dB
Image disturbance ratio - 55dB
Intermediate frequency interference ratio - 90 dB
Spurious interference ratio - 78dB
AM suppression ratio - 55dB
Frequency characteristics - 30Hz to 15kHz, +0 -1dB
Distortion (400Hz, 100% modulation) - Mono - 0.3% / Stereo - 0.8%
Separation - 35dB or more (400Hz)
Antenna terminal - 300Ω (Balanced type) / 75Ω (Unbalanced type)
[Power amplifier section]
Effective output (Both channel drive):
18W + 18W (8Ω, 40Hz to 20kHz)
24W + 24W (4Ω, 1kHz)
20W + 20W (8Ω, 1kHz)
Dynamic power (IHF):
70W (4Ω)
55W (8Ω)
Harmonic distortion:
0.8% or less (At rated output)
0.1% or less (At 1W output)
Cross modulation distortion (60Hz: 7kHz = 4: 1):
0.8% or less (At rated output)
0.1% or less (At 1W output)
Residual Noise:
0.08µV or less
Damping factor:
25 or more (1kHz, 8Ω)
[Preamplifier part]
Input sensitivity / impedance:
Phono - 2.5mV / 47kΩ
AUX, Tape 1, 2, Rec / PB (Input part) - 250mV / 100kΩ
MIC - 2mV / 47kΩ
S / N Ratio:
Phono - 60dB or more (input 2.5mV, B network)
Tape 1, 2, Rec / PB (Input part) - 80dB or more (Input 250mV, A network)
AUX - 70dB (Input 250mV, A network)
MIC - 60dB (Input 2mV, B network)
Output level / impedance:
Rec out - 250mV / 10kΩ
Rec / PB (Output part) - 30mV / 82kΩ
Frequency characteristics:
Phono - RIAA curve, ±2dB
AUX, Tape, Rec / PB (Input part) - 30Hz to 40kHz, +0 -3dB
MIC - 30Hz to 10kHz, +0 -3dB
Tone control:
Bass - ±10dB (100Hz)
Treble - ±10dB (10kHz)
High filter - 5 kHz, 6 dB / oct.
Loudness - +6dB (50Hz) / +4dB (10kHz)
Semiconductors Used:
Transistors x 31 pieces, FET's x 3 pieces, IC's x 2 pieces, Diodes x 21 pieces

AC Outlets:
2 Unswitched (Total 300W)
Power supply:
AC 100V, 50 / 60Hz
Power consumption:
60W
External dimensions (W x H x D):
427 x 149 x 340mm
Weight:
8.5kg
Year:
Around 1975

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