YAMAHA AX-500
¥ 49,800 (released in 1987)
Commentary
Pre-main amplifier with LiD power supply and ALA circuit technology.
A powerful LiD (Low-impedance Drivability) power supply provides a stable power supply.
It is equipped with an ALA (Absolute Linear Amplification) circuit that enables linear amplification according to the input signal level, eliminating even slight distortion that causes sound dullness, such as crossover distortion and switching distortion generated in the power stage.
In order to transmit the high sound quality of CD directly, it is equipped with a CD direct switch in which the CD source can be enjoyed with the highest priority over other inputs.
Equipped with continuous (continuously variable) loudness that balances the sense of hearing by narrowing down the middle range without increasing the low and high range.
While the normal volume position remains unchanged, the more the continuous loudness is reduced, the more the mid-range volume is reduced. The optimum volume is set for the low-range and high-range according to the amount of change in the reduced mid-range. This allows you to eliminate the lack of volume in the low-range and high-range at low volume with your preferred tone.
Bass and Treble tone treble tone control.
It also has a tone bypass switch to defeat the tone circuit.
Equipped with a real-time phono equalizer amplifier that employs a low-noise transistor.
Equipped with MM/MC cartridge selector.
It is equipped with a subsonic filter switch, stereo / mono mode selector switch, balance control, A/B2 series speaker selector switch, overload protection circuit and headphone jacks.
Equipped with an AC outlet with polarity display for 2 power supply connections and 1 non-connection connection connection, and a power cord with polarity display.
Model Rating
| Type | Pre-main amplifier |
| Rated Output (20 Hz ~ 20 kHz) | 100W + 100W (6 Ω, strain 0.015%) 85W + 85W (8 Ω, Distortion 0.01%) |
| Power bandwidth | 10 Hz ~ 50000 Hz (42.5W, 8 Ω, 0.03% strain) |
| Input Sensitivity / Impedance | MC : 160 μ V/220 Ω MM : 2.5mV/47k Ω AUX and others : 150mV/47k Ω |
| RIAA deviation | 20 Hz to 20000 Hz, ± 0.5 dB (MC) |
| Total harmonic distortion rate (20 Hz to 20 kHz) | MC:0.007% MM:0.003% |
| S/N ratio (IHF-A) | MC:67dB MM:84dB |
| Tone control (Maximum Variable Width / T. O. F.) |
Treble : ± 10 dB (3.5 kHz) Bass : ± 10 dB (350 Hz) |
| Loudness | Continuus |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 170W |
| External dimensions | Width 435x Height 139x Depth 332 mm |
| Weight | 7.8kg |