Cyrus/Mission Cyrus 1
¥ 72,000 (around 1987)
Commentary
This is a pre-main amplifier that has received a high reputation around the world.
Careful attention is paid to circuit design to reduce the number of components in the signal path.
The power transistor, which corresponds to the military standard, was specially manufactured for Silas Electronics and is a high-speed linear device.
The driver stage transistors are manufactured at a factory that supplies semiconductors for the United Kingdom military.
It uses passive elements made in West Germany including polypropylene capacitors, polystyrene capacitors, metal film resistors, etc.
The case uses a non-magnetic, non-conductive metal substitute resin manufactured by the Space Development Department of General Electric in the United States and is manufactured by precision injection molding.
In order to simplify the amplifier, circuits such as tone controls, filters, headphone jacks, speaker ON/OFF switches, protective circuits and balance control have been eliminated.
Model Rating
| Type | Pre-main amplifier | ||
| Power Amplifier Unit | |||
| Continuous average power | 30W + 30W (8 Ω, both channel drive) 40W + 40W (4 Ω, both channel drive) |
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| Current supply | Continuous 10 Arms Peak 40A |
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| Damping factor | 100 (20 Hz to 20 kHz) | ||
| Dynamic head room | 1.4dB | ||
| Slew rate | 10 (input filter bypass) | ||
| Distortion factor |
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| Preamplifier Section | |||
| Input Sensitivity (Ref. 1W O/P) | Phono MC:0.04mV Phono MM:0.400mV Line:65mV |
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| Input Overload (1 khz) | Phono MC:27dB Phono MM:27dB Line : Undefined |
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| Maximum output level | Tape out:11Vrms Power amp:17Vrms |
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| Input impedance | Phono MC : 47k Ω + 100 pf Phono MM : 47k Ω + 100 pF Line : 14k Ω |
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| Output impedance | Tape out : 10 Ω + 2.2 μ F Power amp : 0.08 ohm |
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| Frequency characteristic | Phono RIAA : 20 Hz to 20 kHz ± 0.2 dB Line : 1 Hz to 55 kHz -3dB |
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| Total harmonic distortion factor | Phono MC:0.02% Phono MM:0.005% Line:0.004% |
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| Intermodulation Distortion Factor (SMPTE IMD) | Phono MC:0.02% Phono MM:0.005% Line:0.005% |
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| S/N ratio (IHF-A, 1W) | Phono MC:66dB Phono MM:82dB Line:86dB |
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| <Others> | |||
| External dimensions | Width 215x Height 85x Depth 340 mm | ||
| Weight | Approx. 4 kg | ||