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Manual Shure VA 300

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  • Shure 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. AL404 (RE) 27A819 Printed in U. S. A. ...

  • Shure VA 300 - page 2

    VA300 SPECIFICATIONS VA300-C Console Amplifier Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . All silicon transistor mixer/power amplifier Power Output . . . . . . . . . . . 100 watts continuous (RMS); (to 8 ohm load, see Figure 3, Page 7) Voltage Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 db “Mic.” Input Level ...

  • Shure VA 300 - page 3

    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 . . . . . . . . . . . . . . . . . . . Ambien ...

  • Shure VA 300 - page 4

    Figure 1 Front Panel Controls (Refer to Figure 1) 6. Individual Channel “Treble & Bass” Controls (Six, Dual 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). Concentric). 7. ...

  • Shure VA 300 - page 5

    VA300 Vocal Master 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) and (6). set in the “f ...

  • Shure VA 300 - page 6

    Input Connections: Six individual input connectors are provided on the rear panel of the Console. These connectors are standard 1/4 inch phone jacks (22). The Console is designed to operate with any high quality dynamic or ribbon-type high impedance micro- phone. High impedance microphone cables should be limited to a maximum length of 6m (20 ft) t ...

  • Shure VA 300 - page 7

    Figure 3. Typical output power vs. speaker load impedance for the VA300 Vocal Master Column Speaker Placement: It must always be kept in mind that every room or space is acoustically unique and there are no set “rules” for speaker placement. A number of generalizations however may be made which will at least provide a good starting point under ...

  • Shure VA 300 - page 8

    Thermal Overload/Ventilation: The VA300 is equipped with thermal sensing switches on the heat-sinks of the output transistors. The thermal switches are set to shut off AC power to the amplifier when a temperature of 90°C (194°F) is attained on the heat-sinks; the switches will automatically recycle and return AC power when the heat-sink temperatu ...

  • Shure VA 300 - page 9

    A phone jack marked “Reverb Switch” (17) is located on the rear panel of the console. This jack parallels the Master Reverb In-Out switch (4) and allows the reverb to be remotely turned on and off when the Master Reverb switch is in the “In” position. The Master Reverb switch will always override the remote switch and turn off the reverb, s ...

  • Shure VA 300 - page 10

    Phonographs: To connect a” phonograph having a magnetic cartridge, and no preamplifier, to the VA300, attach a cable from the phonograph output to one of the six Input jacks on the Console. Set that channel’s Input Attenuator Switch to the “Mic.“ position. Set the Treble control for that channel at 9:00 o’clock and the Bass control at 3:0 ...

  • Shure VA 300 - page 11

    Adjust the Echo Gain control and the mixer volume con- trols to match the gain of the VA300 inputs. With the mixer connected in this configuration the individual Reverb In-Out switches on the Console should be set to the “In” position. When these switches are set to the “Out” position, that indi- vidual channel will be muted, or “cued.” ...

  • Shure VA 300 - page 12

    Set the controls on the second VA300 Console as follows: Antifeedback Switches to “Out,” Master Reverb Switch “Out,” Individual Volume Controls to “0,” and the Master Volume to “5.” Adjust the Echo “Gain” Control to approximately 1/3 rotation from the c.c.w. off position, and use this control as a volume control to obtain the sa ...

  • Shure VA 300 - page 13

    VA300-C FUNCTIONAL DIAGRAM Figure 11 VA300 Vocal Master SERVICE INSTRUCTIONS 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 ...

  • Shure VA 300 - page 14

    Driver Transistors: Figure 12 Output Transistors: The driver transistors Q33 and Q34, Figure 12, Page 14 are located on the amplifier chassis. Before removing these transistors, write down the lead color and location at each transistor solder junction. If replacing transistors, apply type 120 Wakefield thermal joint compound to each side of the ins ...

  • Shure VA 300 - page 15

    Figure 13 Figure 14 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 t ...

  • Shure VA 300 - page 16

    OHMMETER CONNECTIONS OHMMETER READING “Plus” Lead “Minus” Lead Collector Emitter Collector Emitter Base Base Emitter Collector Base Base Collector Emitter N.P.N. Transistor P.N.P. Transistor High High High High Low Low High High Low Low High High With the ohmmeter “plus” probe on the anode end of a diode, and the “minus” probe on th ...

  • Shure VA 300 - 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. Any buzzes or rattles indicate possible failure. The speakers should all sound generally alike with a sl ...

  • Shure VA 300 - page 18

    REPLACEMENT PARTS LIST FOR VA300-C CONSOLE ** REPLACEMENT KIT CONSISTS OF: ITEM REPL. KIT NO. QTY. PART NO. DESCRIPTION C1 RKC26 1 86A631 Capacitor, 2500 x 100 C2 RKC27 1 86B631 Capacitor, 4000 x 60 D1-D4 RKC46 4 86A406 Silicon Rectifier, 3A., 200V. D5 RKC22 1 86A408 Zener Diode, 22V., 1 W., 5% D6, 7 RKC50 2 86A410 Silicon Rectifier, 100 V. ½A D8, ...

  • Shure VA 300 - page 19

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

  • Shure VA 300 - page 20

    Notes to Circuit Diagram 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 ...

  • Shure VA 300 - page 21

    VA300-C CIRCUIT DIAGRAM ISSUE 6 21 Figure 18 ...

Manufacturer Shure Category Portable Speaker

Documents that we receive from a manufacturer of a Shure VA 300 can be divided into several groups. They are, among others:
- Shure technical drawings
- VA 300 manuals
- Shure product data sheets
- information booklets
- or energy labels Shure VA 300
All of them are important, but the most important information from the point of view of use of the device are in the user manual Shure VA 300.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Shure VA 300, service manual, brief instructions and user manuals Shure VA 300. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Shure VA 300.

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A complete manual for the device Shure VA 300, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Shure VA 300 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Shure VA 300.

A complete Shure manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Shure VA 300 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Shure VA 300, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Shure VA 300, that we can find in the current document
3. Tips how to use the basic functions of the device Shure VA 300 - which should help us in our first steps of using Shure VA 300
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Shure VA 300
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Shure VA 300 in a specific country, if it was not possible to solve the problem on our own.

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