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Фрагмент инструкции
This means that he can change and vary the total sound characteristics of the amplifier simply by turning a single control. 7 The master volume control is very useful for obtaining a number of effects. The most common use of this control is for obtaining overdrive and sustain at low sound levels. Another valuable use for this control is for controlling the response and noise of the amp in a recording studio. The master volume control is the final gain determining element before the signal is fed into the output amplifier and could more accurately be called a '•sensitivity” control. To obtain maximum overdrive and sustain, the individual channel volume controls should be set near maximum, and the output of the system should be adjusted with the master volume control. You will discover that many different and pleasing harmonic effects can be obtained by trying different settings of the tone, volume, and master volume controls. 8 The pilot light indicates when power is applied to the amplifier. 9 The fuse is located within the chassis and should be replaced with one of the proper value if it should fail. It is necessary that the proper value fuse be used to avoid damage to the equipment and to avoid voiding the warranty. If your amplifier blows fuses, the unit should be taken to a qualified service center for repair. 10 The line power switch Is of the three position type with the center position being off. The three position switch has two on positions which are used to ground the amplifier properly. One of the on positions will yield the least hum or popping when the pick up is touched and this is the position that should be used. The power amplifier is built on a large aluminum heatsink to cool the output devices. A thermostat is connected to this heatsink to shut the system down in case of overheating. Low speaker impedances tend to cause the amp to run hotter than normal, and could cause the automatic cutoff to operate if the output stage becomes hot enough to endanger the output devices. The thermostat is self re-setting and normal operation will be restored when the unit reaches safe operating temperatures. OUTPUT POWER @ 1 KHZ @ 120 VAC LINE: Rated Power: 45 W RMS @ 8 Ohms Power vs. Distortion: 45 W RMS @ 5%THD into 8 Ohms 25 W RMS @ 5%THD into 4 Ohms PEAK POWER @ RATED LOAD: 3.4 Amps & 27 Volts, 90 Watts MUSIC POWER OUTPUT @ RATED LOAD: 70 W RMS @ 5%THD FREQUENCY RESPONSE: 3 DB Down @ 40 HZ & 20 KHZ INPUT CHARACTERISTICS: (tone controls flat. Vol. @ 12:00, master full CW) Sensitivity: 30mV @ 1 KHZ-lnput Impedance: 330 K Ohms Nosse: 64 open ckt., 70 50 K Ohms. 72 Short ckt.' TONE CONTROLS: + 20 DB @ 50 HZ & 5 KHZ MIDDLE CONTROL: 20 DB cut MASTER VOLUME: Used in conjunction with input volume to produce overdrive ‘Signal-to-noise ratio in DB below rated output Peavey Electronics Corp. P.O. BOX 2898 / MERIDIAN, MISS. 39301 NOTE ALL TRANSISTORS SPS 933 UNLESS NOTED ALL RESISTORS I/2W UNLESS NOTED ALL CAPACITORS IN MFD UNLESS NOTEO ALL DIODES IA/200V PIV UNLESS NOTED PRIMARY CONNECTIONS FOR EXPORT MODELS 240V 50/60HZ Printed In U.S.A. r Tilr X ■I 39 Pf HH 50K BASS -If- 330PF 430 *30 r-RT ^ Sok< ic J— .02 ^ IK 5W €)' 1 2 02 >5W ♦IV DC 298 r ■EVL *.022 150 VAC 44- SOME MODELS EF 710 HAVE INTERNAL FUSES -H- © » I -36 V loocyso ■J v.±* x-...
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