Amplifier Pioneer A-504R
Amplifier Pioneer A-504R is in the middle category Zenone general line amplifiers manufactured by Pioneer. We can safely say that this model polzuegsya very popular among music lovers. Dimensional streamlined body with large control knobs on the front panel produces very solid impression. Technical solutions, successfully embodied in the model, you must first mark the stabilization temperature of the output stages of the amplifier due to the use of aluminum heatsink new profile for the output transistors. Profile used has a complicated shape, called "aerofoil" (Aero Wing Heal Sink). Company Efforts to address this problem, apparently unsuccessful because radiators can effectively cool nyhodnye transistors due to a better redistribution of heat throughout their plane, avoiding local overheating transistors. Improved crosstalk between channels achieved by through the use of two-stage volume control knob ne engine runs on a matching buffer circuit having a high input and low output impedance. The latter circumstance is decisive to control the power amplifier (PA). In this case, the input circuit is controlled by the PA significantly higher currents (hundreds of times more than is usually the case). This allows you to improve signal/noise ratio and thereby extend the frequency range of the amplifier. Rationally made power supply consisting of a powerful power transformer permalloy shielding, as well as complementary high capacity filter capacitors installed in the immediate vicinity of the output transistors, ultimately determines the significant dynamic power A-504R. No less interesting company applies innovative solutions for vibration - Pioneer amplifier design. For example, the circuit board and insulated from the power transformer of the chassis with antivibration gaskets, and finally the whole construction of the amplifier is mounted on four anti-vibration mounts.
Amplifier has six inputs, switching which is done either buttons on the front panel A-504R, or with remote control. Timbre of the amplifier can to lift and rolloff at -/+10 dB at 100 Hz and 10 kHz. If necessary tembroblok disconnected button "Direct Source" and Pioneer A-504R enters the linear amplification of the signal.
Listening amplifier conducted on vinyl, CD and tape. As noted, the sound produced from the amplifier, founder and neutral, well- saturated lower frequencies have to listening to music pieces with a high content of the lower bass register, particularly bass, organ, etc. Of sounding quite transparent and is life character. Notes that play vinyl and digital media is very close to nature sounds. The amplifier has a good balanced tone and lets you listen to music material without any tone correction, ie Mode "Direct source", in a certain way that speaks in favor of this unit, determining its qualitative parameters. The amplifier works well at low and at maximum capacity.
