Shure SE20 User guide

monaural source to one channel of the SE20, the SE20 input should be shunted with a 47,000 ohm resistor or the high frequency trimmer should be readjusted for proper high frequency equalization.

Outputs: Output terminals appear on the rear panel as shown in Figure C . Outputs are balanced and designed to feed a 150 ohm or 600 ohm line.

- t20 fl z

110

0 g o

Lz w

$ - I 0 a

_I

Lz

-20

20 50 100

FREQUENCY

1,000

IN HERTZ

TYPICAL EFFECT OF RESPONSE TRIMMERS

FIGURE E

10,000 20,000

220 Volt Operation: The power transformer may be restrapped for operation with 220 volt A.C. supply. To make this change, see instructions on schematic for revising power transformer connections.

REAR PANEL

FIGURE C

Channel Level Controls: These controls are located on the front panel designated as “Channel A Level” and

“Channel B Level.” They are used to adjust the overall operating level of the SE20 and to balance the individual levels of the two channels.

Response Trimmers: To allow for balancing the response of the two channels of a stereo cartridge, or of two monaural cartridges, high and low frequency response trimmers are provided for each channel. Figure

D shows the location of these controls and Figure E shows the range and character of the response change obtainable.

Guarantee: This Shure product is guaranteed in normal use to be free, from electrical and mechanical defects for a period of one year from the date of purchase.

Please retain proof of purchase date. This guarantee includes all parts and labor.

Shipping Instructions: Carefully repack the unit and return it prepaid to the factory. If outside the United

States, return the unit to your dealer or Authorized

Shure Service Center for repair. The unit will be re- turned to you prepaid.

LOW FREQUENCY TRIMVER

HIGH FREQUENCY TRIMMER

RESPONSE TRIMMERS

SIDE VIEW (COVER REMOVED)

FIGURE D

1

I

jlfiTSklM,

-

R 2 5

2.CHANNEL

"n"

IS SHOWN,

CHANNEL'B" IS I D E N T I C A L

T O C H A N N E L "A':

3. ALL RESISTORS 112 WATT 5 9 CARBON COMPOSITION

UNLESS SHOWN. P O T E N T i O i E T E R S 2 0 % TOLERANCE.

4.ALL NON -ELECTROLYTIC CAPACITORS IN MFD. 10%

AND '100 VOLTS O R MORE UNLESS SHOWN.

ELECTROLYTIC CAPACITORS SHOWN I N M F D X V O L T S

( T O L E R A N C E , - I 0 f 5 0 UNLESS SHOWN).

MODEL

SE20

STEREO TRANSCRIPTION PREAMPLIFIER SCHEMATIC