Sony STR-7800SD

1 9 7 5 1975
1 9 7 8 1978

That I'm aware of, the STR-7800SD was only available (sort of...) in the North American markets and not at all in Europe where the more common (but already worthwhile) STR-6800SD was sold as lineup topper.

Sony's top-end units were (and still are) scarcely distributed (if at all) so, like many others, unfortunately, the 7800SD is one monster receiver almost no one has seen.

Pity - because the STR-7800SD sported such ultra-high-end componentry as a toroidal transformer and LEC transistors - near science-fiction in 1975 !

Plus OCL outputs and DC circuitry, a PLL/MOS-FET 4-gang tuner section, three speaker pair outputs, an adaptor loop, Dolby FM compatibility, lots of power and supersized (but rigorous) looks to match the inside.

The enormous toroidal transformer and one of the two heatsinks would find their way in the little (but big) Wega Modul 42V, a Wega-designed integrated amp with Sony parts.

Sony STR-7800SD, image 1 Sony STR-7800SD, image 2
Sony STR-7800SD specifications
Title Value
Power amp Power amp
RMS Power: 2x 125W (8 Ohm, 20Hz...20kHz; 0,07% THD)
THD: 0,07% at rated power
IMD: 0,07% at rated power
0,01% at 1W
Damping factor: 40 (8 Ohm)
3 pairs
Headphones output: 1 Ohm or 10kOhm
Residual noise: 0,1µW
Preamplifier Preamplifier
Inputs: 2,5mV / 50kOhm (phono 1 & 2)
205mV / 100kOhm (aux, tape 1&2, adaptor)
Phono overload: 100mV at 0,07% THD
Outputs: 250mV / 47kOhm (tape, adaptor)
42mV / 82kOhm (DIN)
THD: 0,07% at rated output
IMD: 0,07% at rated output
Frequency response: 20Hz...20Khz (± 0,5dB, RIAA)
10Hz...30Khz (+0 / -2dB, line)
S/N ratio: 72dB (phono at 2,5mV input)
90dB (line at 250mV input)
Bass control: ±10dB at 100Hz
Treble control: ±10dB at 10Khz
High Filter: 6dB/octave above 5Khz or 10Khz
Low filter: 6dB/octave above 50Hz or 25Hz
Loudness contour: +10dB at 50Hz and +3dB at 10Khz
Low boost: +9dB at 50Hz
Presence: +3dB at 1Khz
General General
Componentry: 3 FETs
4 ICs
73 transistors
35 diodes
1 LED
PC: 300W maximum
Dimensions: 49 x 17 x 51,5cm
Weight: 22,8kg.
FM section FM section
Usable sensitivity: 1,7µV (IHF'58)
50dB quieting: 3,5µV (mono)
3,5µV (stereo)
S/N ratio: 73dB (mono)
68dB (stereo)
Capture ratio: 1,0dB
Selectivity: 80dB
Image rejection: 100dB
Spurious rejection: 100dB
AM suppression: 54dB
THD: 0,2% (mono, 100Hz...10Khz)
0,3% (stereo (100Hz...10Khz)
IMD: 0,2% (mono, 100Hz...10Khz)
0,3% (stereo (100Hz...10Khz)
Frequency response: 30Hz...15Khz (+0,2 / -1,5dB)
Stereo separation: 35dB (100Hz)
40dB (1Khz)
35dB (10Khz)
RF intermodulation: 65dB
Subcarrier product ratio: 60dB
SCA suppression: 60dB
Antenna terminals: 75 Ohm unbalanced
300 Ohm balanced
Features: Features
MOS-FET RF amplification stage
FET mixer circuit
FET-buffered local oscillator
2x UNI-Phase IF filters
Phase-Locked Loop IC
Built-in Dolby NR system
Signal/Multipath meter
Sony STR-7800SD : 0 topic
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page online since : may 2007
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