| 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
1975
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.
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