ONKYO A-913
¥ 48,000 (around 1992)
Commentary
This pre-main amplifier was developed by refining the model sold overseas with the concept of how to express music without relying only on excessive high power and numbers.
The power amplifier circuit is composed of discrete elements to ensure freedom in sound quality design.
A feedback type constant current differential amplifier stage is adopted for the input of the power section to provide stable operation, and a linear switching circuit is adopted for the output stage to improve the linearity of circuit operation without changing bias and to suppress crossover distortion.
The power supply section is composed of a large transformer and an electrolytic capacitor (10,000 μ Fx2) in an orthodox way. The diode is a bridge type with four large current types in one package.
Each block is arranged so that the signal path from the input pin jack is the shortest in order to ensure simplicity and straightness.
In addition, it is equipped with all source direct switch that all sources including CD are directly input to the power amplifier via the exclusive volume only.
For the insulator, we have adopted a vibration prevention structure with improved thickness in the middle and low range by using a special structure of pinpoint receiver.
It comes with a remote control and you can operate the tuner T-403 as a pair.
In addition, in order to prevent digital noise from mixing in, we have adopted a special power supply for the microcomputer. In addition, a microcomputer block for the remote control is placed between the front angle and the front panel for magnetic shielding.
Model Rating
Type | Stereo pre-main amplifier |
Rated output (20 Hz to 20 kHz, CD → SP out, both channels driven) |
75W + 75W (6 Ω) 60W + 60W (8 Ω) |
Dynamic Power | 2 Ω : 135W + 135W 4 Ω : 110W + 110W 6 Ω : 95W + 95W |
Total harmonic distortion rate (20 Hz to 20 kHz) | 0.08% (CD → SP Out, at rated output, 8 Ω) 0.003% (Phono MM → Rec Out at 3 v output) 0.015% (Phono MC → Rec Out at 3 v output) |
Intermodulation distortion factor (20 Hz to 20 kHz) | 0.06% (CD → SP Out, at rated output) |
Powerbandwidth | 5 Hz to 100 kHz (IHF-3dB, THD 0.2%, 8 Ω) |
Damping factor | 40 (1 kHz, 8 Ω) |
Frequency characteristic | Phono → Rec Out (RIAA deviation) : 20 Hz to 20 kHz ± 0.5 dB CD → SP Out : 2 Hz ~ 80 kHz + 0 -3dB |
Phono maximum allowable input (1kHz/10kHz, 0.005%) |
MM:150mV/710mV MC:20mV/110mV(0.08%) |
Input Sensitivity / Impedance | Phono MM : 2.5mV/50k Ω Phono MC : 350 μ V/330 Ω CD, Tape Play, etc. : 150mV/50k Ω |
Rated output voltage / impedance | Tape Rec, etc. : 150mV/3k Ω |
SN ratio (IHF-A filter input short) | Phono MM:83dB Phono MC:65dB CD, other : 97 dB |
Tone Control Maximum Change | Bass : ± 10 dB (20 Hz) Treble : ± 10 dB (20 kHz) |
Muting | -20dB |
Pwer | 100 VAC, 50Hz/60Hz |
AC outlet | Switched : 2 systems, 100W Unswitched : 1 line, 100W total |
Power consumption (Electrical Appliance and Material Control Law standard) | 115W |
External dimensions | Width 455x Height 120x Depth 330 mm |
Weight | 6.7kg |
Attachment | Remote control |