SR105B AMPLIFIER CONVERSION

 

PARTS

 

 

MATERIALS

 

Shure

Description

Qty.

Description

Qty.

Part No.

1

51A244

Transformer, 70V

2

Locknuts, 10-32*

 

 

Output (T3)

 

 

1

55C131

Switch, Slide, DPDT

2

Machine Screws,

 

 

6 4 )

 

Phillips Round

 

 

 

Head, 4-40 x 3/16"

 

 

 

 

1

56A204

Terminal Strip, 3-

4

Machine Screws,

 

 

Screw-Terminal (TS2)

 

Phillips Head,

 

 

 

 

6-32 x % "

1

90A2038

Filter Circuit

4

Machine Screws,

 

 

Board Assembly

 

Phillips Head,

 

 

(A21

 

6-32 x '1'4"* *

 

 

 

 

 

 

 

-

Wire, Hookup,

 

 

 

 

16 Gauge AWG,

 

 

 

 

Stranded Copper,

 

 

 

 

Vinyl Insulation

 

 

 

-

Wire, Hookup, 20

 

 

 

 

Gauge AWG, Stranded

 

 

 

 

Copper, Vinyl

 

 

 

 

Insulation

 

 

 

-

Solder, Rosin-Core

11

/I

I(

11

II II

TOOLS

Description

Pliers, Diagonal, or Wire Stripper

Pliers, Long-nose

Screwdriver

Screwdriver, Phil- lips Head

Soldering Iron, Low Wattage

Wrench, Open-End, Adjustable

Two locknuts are presently securing lamp socket assemblies; two more are required.

*'Four machine screws presently securing rear-panel 70-Volt Conversion Cover (53A1319) may be used.

 

 

 

 

T 3

 

 

 

 

GRN

RED

 

 

 

 

YEL

 

 

 

 

r

BLK

 

 

 

 

 

-

J4 - J 7

 

 

 

 

 

 

 

 

WHT

 

 

 

 

 

 

 

 

 

 

WHT

 

 

 

 

 

I-

 

 

 

 

 

-

TS 2 0

0

0

 

d

0 TS I

COM

CT

7 0 V

 

2 8 V

GND

FROM FILTER CIRCUIT

 

 

s4-

OFF

 

 

 

 

 

BOARD PIN V

 

 

 

 

 

FROM MAIN CIRCUIT

YEL/BLK

 

 

 

 

 

 

 

 

BOARD PIN J

 

 

 

 

 

FROM FILTER CIRCUIT

BLU

0

 

0

 

BOARD PIN T

 

 

 

7 0 V

 

 

 

 

 

 

FIGURE 15. 70-VOLT CONVERSION: ADDED CIRCUITRY

16

Page 22
Image 22
Shure SR105 service manual Grn Red Yel Blk, Wht, Com