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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, D9

RKC23

1

86A409

Zener Diode, 3.6 V., 1 W., 5%

F1

}

 {

RKC62

5

80A159

A.C. Fuse

F2

5

80A160

D.C. Fuse

F3

-

-

80A269

Wired-in A.C. Fuse

I1

RKC45

1

80A79

Pilot Lamp, Thermal Overload

I2, I3

RKC34

2

90A1463

Lamp Assembly, Front Panel

J1-J7

RKC87

1

95C446

Phone Jack

J 8

RKC86

1

95A446

Phone Jack

J9-J12

RKC68

1

95B446

Phone Jack

M1

RKC82

1

95A510

3-Wire A.C. Line Cord

and Grounding Plug

M2

RKC39

4

65A685

Bumper (Plastic Foot)

M 3

RKC30

1

95A430

Reverberation Assembly

M 4

RKC36

1

95A444

Antifeedback Inductor Assembly

M 5

RKC32

1

90BD2600

Handle Assembly

M6

RKC24

1

90A1370

Console Cabinet

M7

RKC49

3

9082285

Volume Control Knob Assembly

M 8
M 9

}

 {

RKC48

3

90B1391

Treble Control Knob Assembly

3

65A686A

Bass Control Knob

M10, M11

- - -

-

95A429

Fuse Holder

M12

RKC70

1

32A627

Knob and Screw (Line Cord Storage

Spindle)

M13

-

-

-

-

48A21

Cabinet Upper Side Rail

M14

-

-

-

-

48A22

Cabinet Lower Side Rail

Q1-Q23,

RKC9

4

86A349

Transistor (Replaces 86A327)

Q25-Q31
Q24

RKC52

3

86A324

Transistor

Q32

RKC53

1

86A333

Transistor 110 V. BV

CEO

 Min

Q33

RKC55

1

86A338

Transistor 110 V. BV

CEO

 Min.

Q34

RKC54

1

86A339

Transistor 105 V. BV

CEO

 Min.

86B339

(Mutually Interchangeable)

Q35-Q38

-   -   -

-

86A332*

Transistor 110 V. BV

CEO

 Min.,

86B332*

150 W.

R1-R6,

RKC58

1

46A017

Potentiometer, Dual 50K/50K

R14
R7-R12,

RKC59

1

46A016

Potentiometer, 50K.

R16
R13

RKC57

1

46A018

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

Resistor

S1

RKC61

1

55A72

Toggle Switch

S2, S3

RKC37

1

95A551

Thermostat

S4-S9

RKC10

4

55A54

Slide Switch (Screw Slot)

S10-S16

RKC44†

1

55A73A†

Rocker Switch, Chrome

S17

RKC43

1

55A73E

Rocker Switch, Red/Orange

S18

RKC42

1

55A73D

Rocker Switch, Orange

S19

RCK41

1

55A73C

Rocker Switch, Orange/Yellow

S20

RKC40

1

55A73B

Rocker Switch, Yellow

T1

RKC35

1

51A215

Power Transformer

T2

RKC28

1

51A217

Feedback Transformer

COMMERCIAL ALTERNATE

NONE
NONE
Motorola No. 1N4721
Motorola No. 1N4748A
Motorola No. 1N4002
Motorola No. 1N4729A
Littelfuse 3AG/3A/SB (Slo-Blo)
Littelfuse 3AG/5A

Bussman MDV/5A/5B (Slo-Blo)
Pigtail
Leecraft No. 36N1311-6
NONE

Switchcraft No. 12-A
Switchcraft No. 14-B
Switchcraft No. 11
NONE

Gibbs No. 4L (Insulated Output)
NONE
NONE
NONE
NONE
NONE
NONE
Littelfuse 342014

NONE

NONE
NONE

Motorola No. MPS-6521

Texas Inst. No. 2N3711

Motorola No. MPS-3392
RCA No. 40349
RCA No. 2N3441
Motorola No. 2N3741 Selected

RCA No. 2N3773

NONE

NONE

NONE
NONE
NONE

NONE
NONE
Workman No. FRT-2
Cutler-Hammer No. 7563K5
NONE
Continental-Wirt No. G-326
NONE
NONE
NONE
NONE
NONE
NONE
NONE

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.

*When ordering 86A332 or 86B332, specify current gain code. See Page 14.

**Parts listed as RKC Kits should be ordered by that kit number. Any orders received for piece parts where RKC Kit number is shown will be shipped in RKC quantities.

†For gray switch, order Part No. 55A73F.

18

Summary of Contents for 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 AL404 RE 27A819 Printed in U S A...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

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