Related Manuals for Shure Vocal Master VA 300
Summary of Contents for Shure Vocal Master VA 300
- Page 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. Printed in U. S. A. AL404 (RE) 27A819...
- Page 2 VA300-C Console Amplifier Type ......Power Output ... 100 watts continuous (RMS); (to 8 ohm load, see Figure 3, Page 7) Voltage Gain .
- Page 3 Weight ..........The Shure Model VA300 Vocal Master Sound System con- sists of one Control Console (VA300-C) and two Speaker Columns (VA300-S).
- Page 4 Front Panel Controls (Refer to Figure 1) 1. “Anti-Feedback” Switches (Four). 2. “Reverb Intensity” Control. 3. “Reverb Treble & Bass” Controls (Dual Concentric). 4. “Master Reverb” Switch. 5. Individual Channel “Volume” Controls (Six). Rear Panel Controls and Connections 11. Line Cord Storage Spindles. 12.
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Page 5: Operating Instructions
OPERATING INSTRUCTIONS General Operating Instructions: 1. Set all front panel controls in the following manner: All switches (1), (4). (7). set to “Out” position; “Reverb Intensity” Control (2). and all “Volume” Controls (5) and (8), set at “0”; all “Treble” and “Bass” Controls ( 3 ) a n d ( 6 ) . -
Page 6: Input Connections
2 VA300-S and 1 VA301-S 2 VA300-S and 2 VA301-S If additional speakers (more than in the table above) are required, use a Shure PM300 Power Master Amplifier to drive the extra speakers. See page 11 for instructions. IMPEDANCE OHMS (NOMINAL) 10.6... -
Page 7: Power Connections
To “aim” speakers up for effective coverage of a balcony, use the Shure Model A3S-S Speaker Stand. This stand will provide added stability and approximately 150 of tilt. In an emergency, a spare microphone stand can be used to hold up a tilted speaker column. - Page 8 Thermal Overload/Ventilation: The VA300 is equipped with thermal sensing switches on the heat-sinks of the output transistors. The thermal switches a r e s e t t o s h u t o f f A C p o w e r t o t h e a m p l i f i e r w h e n a temperature of 90°C (194°F) is attained on the heat-sinks;...
- Page 9 A phone jack marked “Reverb Switch” (17) is located on the rear panel of the console. This jack parallels the Master R e v e r b I n - O u t s w i t c h ( 4 ) a n d a l l o w s t h e r e v e r b t o b e remotely turned on and off when the Master Reverb switch is in the “In”...
- Page 10 “in phase” with each other. Additional Inputs Using a Mixer: If additional microphone inputs are required, a microphone mixer (such as a Shure M68 type) or a second Vocal Master Console may be used. When using a microphone mixer for the additional inputs, connect the mixer High Impedance Mic.
- Page 11 If it is necessary to use two consoles on a permanent basis a factory authorized COMMON MIX. BUS MODIFICATION is available. Contact your Shure Dealer or the Shure Factory for further information on this. Additional Power or Area Coverage:...
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Page 12: Stereo Operation
Set the controls on the second VA300 Console as follows: A n t i f e e d b a c k S w i t c h e s t o “ O u t , ” M a s t e r R e v e r b S w i t c h “Out,”... -
Page 13: Amplifier Removal
Amplifier Service (See Guarantee): The VA300 Vocal Master Console uses components of the highest quality, operating well within their respective ratings to assure long life. CAUTION: There are no user serviceable parts inside. Refer servicing to qualified service personnel. Amplifier Removal: To remove the amplifier from its carrying case, remove the three screws located at the top front edge of the case and the six screws, four within the plastic feet, on the bottom of the case. -
Page 14: Driver Transistors
When replacing output transistors be sure to replace with devices which have the same gain code as the original transistors. Shure transistors are coded either by the last letter in the part number or a color-dot on the top of the transistor. - Page 15 Small Signal and Predriver Transistors: Transistors Q1 through Q30, Figure 14, Page 15 and Q31 and Q32, Figure 12, Page 14 are mechanically supported by their leads. When replacing these transistors, it is imperative that proper lead configuration be followed. A minimum of sold- ering heat should be used to avoid damage to the transistor.
- Page 16 SHIPPING INSTRUCTIONS: Carefully repack the unit and return it prepaid to the factory. If outside the United States, return the unit to your authorized Shure Service Center for repair. The unit will be returned to you prepaid. SERVICE: If information or service should be required, contact your local Shure Vocal Master dealer explaining your difficulty in detail.
- Page 17 VA300-S Speaker Servicing: 1. Unplug cables from speaker jacks. 2. Remove back of cabinet. 3. Disconnect one end of the lead connected between the two 10 inch loudspeakers. 4. Apply 60 Hz, 1 to 10 volts, to each of the six speakers individually.
- Page 18 NOTE: The Commercial Alternates shown above are not necessarily equivalents, but may be used in the event that direct factory replacements are not immediately available. To maintain the highest possible performance and reliability, Shure Factory Replacement Parts should be used.
- Page 19 ALTERNATE POWER SUPPLY INCORPORATED IN EARLY PRODUCTION UNITS Figure 17...
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Page 20: Voltage Measurements
D.C. Voltage Measurements: Check the DC voltages first, because any deviation from the nominal voltages will affect the AC voltage. In the power amplifier section, Q31 to Q38, the key DC voltages are +94 (collector of Q33, Q35, and Q37). +22 (collector of Q31), and the split voltage at the junction of R17, R19, R20, and R22. - Page 21 VA300-C CIRCUIT DIAGRAM ISSUE 6 Figure 18...
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