The Yamaha R-300 is a stereo receiver from the Yamaha Corporation, a Japanese conglomerate that specializes in musical instruments, motorcycles, and other electronics. Sold between 1981 and 1983, the R-300 uses Yamaha's "Natural Sound" high-end speaker technology, optical balance tuning, and continuously variable loudness control. Whether you've found one of these over the Internet or through a thrift store, knowledge of the R-300's specifications can help you decide if it's the right addition to your home entertainment system.
Audio Section
When noted, the standards established by the Institute of High Fidelity, or IHF, are used. The Yamaha R-300 has a power bandwidth between 10 Hz and 40 kHz at 0.02 percent total harmonic distortion -- or THD -- and 15 W (8 ohms). At 1 kHz, 8 ohms, its damping factor is better than 40. Its continuous output power per channel (IHF) between 20 Hz and 20 kHz, at 0.015 percent THD, 8 ohms, is 30 W, and 35 W at 1 kHz with 0.01 percent THD, 8 ohms. Its output level/impedance in phono is 120 mV/470 ohms.
FM Section
The tuning range of the R-300's FM is between 87.6 and 108 MHz. Its 50 decibels quieting sensitivity is at 3.0 microvolts in mono and 40 microvolts in stereo. It has an image response ratio of 50 decibels, an IF response ratio of 90 decibels, a spurious response ratio of 70 decibels, an AM suppression ratio (IHF) of 60 decibels, and a capture ratio of 1.5 decibels. In mono, the FM's signal-to-noise ratio (IHF) is 84 decibels, while in stereo it is 80 decibels. Harmonic distortion at 100 Hz is 0.1 percent in mono, 0.2 percent in stereo. At 6 kHz, harmonic distortion is 0.15 percent in mono and 0.3 percent in stereo.
AM Section
The tuning range of the Yamaha R-300's AM is between 525 and 1,605 kHz, with a usable sensitivity of 300 microvolts per meter. Selectivity at plus or minus 10 kHz is 30 decibel. The AM section's signal-to-noise ratio is 50 decibels, while its image response ratio is 40 decibels and its spurious response ratio is 50 decibels. At 1 kHz, its harmonic distortion is 0.4 percent.
General
The Yamaha R-300 stereo receiver weights 16.94 lbs. It is 17-1/8 inches wide, 13-1/4 inches in depth, and stands 4-3/4 inches tall. It uses as its semiconductor 24 transistors, 10 integrated circuits, 1 Field Effect Transistor -- or FET -- to control output current, with 4 LEDs and 22 diodes. Power supplies vary between regional models, with the U.S. and Canadian models at AC 120 V and 60 Hz, the North European model at AC 220 V and 50 Hz, the British and Australian models at AC 240 V and 50 Hz, and the general model at AC 110, 120, 220, or 240 V, and either 50 or 60 Hz. The USA and Canadian models consume 130 W of power, while the North European, British, and Australian models each consume 180 W. The general model consumes only 70 W.
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