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VA300-C Console (cont’d)

Power Supply  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

120 volts, 60 Hz.

80 watts maximum with no signal in.

180 watts with 1 KHz. signal and 100 watts output

400 watts maximum operating

-7°C to 43°C (20°F to 110°F) without derating

Power Consumption  . . . . . . . . . . . . . . . . . . .

Ambient Temperature Range

. . . . . . . . .

Dimensions

. . . . . . . . . . . . . . . . . . . . . . . .

213 mm height x 635 mm width x 375 mm

depth (8-3/8 in. x 25 in. x 14-3/4 in.)

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17.25 kg (38 Ibs.)

VA300-S Speaker Column

Power Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 watts

Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 ohms

Frequency Response

. . . . . . . . . . . . . . . . . . . . . . . .

Horizontal Distribution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50 Hz. to 10,000 Hz.

1 4 0 °

Vertical Distribution

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6 5 °

Dimensions

. . . . . . . . . . . . . . . . . . . . . . . . . . .

1594 mm height x 400 mm width x 222 mm

depth (62-3/4 in. x 15-3/4 in. x 8-3/4 in.)

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31.78 kg (70 Ibs.) including cable

DESCRIPTION

The Shure Model VA300 Vocal Master Sound System con-

sists of one Control Console (VA300-C) and two Speaker

D e s i g n e d   s p e c i f i c a l l y   f o r   t h e   p e r f o r m i n g   v o c a l i s t ,   t h e

Columns (VA300-S).

VA300 Vocal Master Sound System provides the required
portability, flexibility, and dependability demanded by profes-

sional entertainers.

The VA300-C mixer/power amplifier Console permits the

user to mix up to six microphones with individual control over

volume, tone and reverberation. A solid-state 100 watt R.M.S.

power amplifier is incorporated in the Console. Unique cir-
cuitry design protects the solid-state components against dam-

age as a possible result of open-circuit or short-circuit condi-

tions of the amplifier outputs. The output transistors are also

protected against overheating by the use of automatic thermal

sensors. All components of the VA300 Vocal Master Sound

System are conservatively rated and are operated well within

their respective tolerances to assure long life and trouble-free

The VA300-C is Underwriters Laboratories, Inc. listed, and is

listed by the CSA Testing laboratories as certified.

performance.

The VA300-S Speaker Columns are highly directional, wide

range, line-radiators. A rear-ported enclosure is utilized which
contributes to the directional characteristics of the Speaker

Column and is crucial in reduction of feedback.

The VA300-S employs four special 8-inch loudspeakers and

two special 10-inch loudspeakers providing a total cone area of
2,310 cm² (358 in²).

Each Speaker Column is furnished with a 15m (50 ft) #18

gauge, 2-conductor rubber jacketed cable with locking phone
plugs attached.

3

Содержание Vocal Master VA 300

Страница 1: ...VA 300 OPERATING AND SERVICE MANUAL Manufactured by SHURE BROTHERS INC 222 Hartrey Avenue Evanston Illinois 60204 U S A Copyright 1978 Shure Brothers Inc AL404 RE 27A819 Printed in U S A...

Страница 2: ...eble Control Action 10 db at 10 000 Hz with respect to flat setting To Tape Recorder Jack Impedance 5 000 ohms Output 19 db below speaker output nominal 2 V at 50 watts to speakers Clipping Level 4 V...

Страница 3: ...to mix up to six microphones with individual control over volume tone and reverberation A solid state 100 watt R M S power amplifier is incorporated in the Console Unique cir cuitry design protects th...

Страница 4: ...olume Control 9 Thermal Overload Indicator Lamp 10 On Off On Power Switch Figure 2 Rear Panel Controls and Connections Refer to Figure 2 11 Line Cord Storage Spindles 12 A C Line Cord 13 D C Fuse 3AG...

Страница 5: ...O to whichever 7 8 9 10 11 On position results in the least amount of hum coming from the speakers Now turn up the other Individual Channel Volume Controls 5 which are being used By use of the Indivi...

Страница 6: ...weight inherent in such transformers The speaker output vol tage is 28 3 volts to an 8 ohm load for 100 watts This allows long speaker lines with wiring practices consistent with those used for 25 vol...

Страница 7: ...o them A shallow broad room might require four speakers to be utilized in order to cover the extreme horizontal expanse Again if balconies were added four more speakers might be required to expand the...

Страница 8: ...flat sounding voice It is often used to great advantage to reduce high frequency acoustic reverberation in reflective rooms The Master Volume control 8 adjusts the output level of the total mixed outp...

Страница 9: ...perated When connected in the manner described the individual channel Reverb In Out switches will offer selective echo in addition to selective internal reverb With the Master Reverb In Out switch in...

Страница 10: ...put jack the low impedance end is terminated with a Cannon type 3 pin female connector The main advantage of low impedance microphones is that virtually unlimited cable lengths may be used whereas hig...

Страница 11: ...TION is available Contact your Shure Dealer or the Shure Factory for further information on this Additional Power or Area Coverage In those applications which require more power than one VA300 Vocal M...

Страница 12: ...tems simply use a Y connector on that microphone and feed its signal to one Input on each Console For making stereo tapes the To Tape Recorder jacks one on each console may now be connected to the lef...

Страница 13: ...dge of the case and the six screws four within the plastic feet on the bottom of the case Push the amplifier slightly forward from the back to permit access to the front panel Note Uncoil the cable be...

Страница 14: ...he following modifica tion if not already performed place insulated tubing over the leads of a 3 3k 1 2W resistor and solder it across the terminals to which the white and black leads of transformer T...

Страница 15: ...ctive transistors and diodes may be located by use of an ohmmeter Polarity of the ohmmeter must be verified before these checks are made With a known diode orientation measure the diode resist ance in...

Страница 16: ...a malfunction should occur The amplifier can be operated without this assembly To eliminate possible damage or shock hazard the plug in cables should be temporarily inserted in the nylon inserts norma...

Страница 17: ...hms Read ings outside of these limits indicate possible failure 6 Reconnect lead disconnected in Step 3 Install back of cabinet tightly REPLACEMENT PARTS LIST FOR VA300 S SPEAKER COLUMN REP REPLACEMEN...

Страница 18: ...A018 Potentiometer 50K R15 RKC60 1 46A020 Potentiometer 2 5K R17 R18 45EC439B Resistor 43 ohms 5 W R19 R21 R20 45EC209B Resistor 20 ohms 5 W R22 45EC129B Resistor 12 ohms 5 W R23 RKC47 1 45A38 Resisto...

Страница 19: ...ALTERNATE POWER SUPPLY INCORPORATED IN EARLY PRODUCTION UNITS Figure 17 19...

Страница 20: ...ume controls set to maximum 11 Master reverb switch set to OUT position except as noted Chassis Ground Preamplifier Ground 12 Individual channel reverb switches set to OUT pos Reverb ition except wher...

Страница 21: ...VA300 C CIRCUIT DIAGRAM ISSUE 6 21 Figure 18...

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