Fender The Twin Owner Manual - Page 5

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FUSE

REPLACE

WITH

0

INPUT

POWER

SAME

TYPE

120

V

60

H

z

4A

-

125V

SLO

BLO

FENDER

MUSICAL

INSTRUMENTS

CORP.

WMA.

CA.

USA

92621

MODEL

THE

TWIN

SERIAL

NURSER

POWER

POWER

PREAMP

AMP

AMP

//

OUT

EFFECTS

OOP

THRU

LOOP

CAUTION:

LEVEL

TO

REDUCE

SHOC

THE

K

RISK

NOT

OF

ELECTRIC

00

REMOVE

CHASSIS.

NO

USER

SERVICEABLE

PARTS

INSIDE.

REFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL.

UN

PICO

KIN

AVIS:

RISQUE

DE

-11kilv

-Mir

*IOW

CHOCELECTRIQUE-

NE

PAS

OUVRIR.

O

TWIN

REAR

PANEL

FUNCTIONS:

A.

FUSE

-This

fuse

is

in

the

AC

supply

of

the

amplifier

and

will

help

to

protect

the

amplifier

and

operator

in

the

event

of

an

electrical

fault.

If

a

fuse

blows,

it

should

only

be

replaced

with

a

fuse

in

accordance

with

the

listing

at

the

fuse

holder.

If

the

amplifier

repeatedly

blows

fuses,

it

should

be

checked

out

by

a

qualified

technician.

Under

no

circumstances

should

a

fuse

with

a

higher

current

rating

or

a

fuse

bypass

be

used

as

this

could

cause

equipment

damage

and

present

a

serious

safety

hazard.

B.

PREAMP

OUT

—This

jack

provides

an

unbalanced

output

signal

from

the

preamp.

Its

nominal

level

is

set

by

the

LOOP

LEVEL

SWITCH.

(See

E).

This

output

can

be

used

in

conjunction

with

the

POWER

AMP

IN

jack

as

a

patch

point

for

effect

units.

C.

POWER

AMP

IN

—This

jack

inputs

signal

directly

to

the

power

amp.

It

automatically

disconnects

the

preamp

signal

when

used.

This

is

useful

when

using

the

effects

loop

option

or

using

the

TWIN

as

a

slave

amp.

Its

nominal

sensitivity

is

set

by

the

LOOP

LEVEL

SWITCH.

(See

E).

D.

POWER

AMP

THRU—This

jack

provides

an

unbalanced

output

signal

from

the

preamp

and

is

post

EFFECTS

LOOP

(POWER

AMP

IN).

This

signal

can

be

used

to

feed

recording

and

sound

reinforce-

ment

mixers

or

more

often

to

drive

other

TWIN

amplifiers

as

slaves.

This

is

done

by

connecting

a

standard

guitar

cord

from

the

POWER

AMP

THRU

jack

of

the

master

amplifier

to

the

POWER

AMP

IN

jack

of

the

slave,

then

from

the

POWER

AMP

THRU

jack

of

the

slave

to

the

POWER

AMP

IN

jack

of

the

next

slave,

etc.

Its

nominal

level

is

set

by

the

LOOP

LEVEL

SWITCH

and

this

switch

should

be

set

to

the

same

level

on

all

the

amplifiers

in

the

chain.

(See

E).

(NOTE:

This

output

works

best

with

tube

type

slave

amps,

see

J.

BALANCED

LINE

OUT

for

slaving

solid-state

slave

amps.)

E.

LOOP

LEVEL

SWITCH

-Selects

the

nominal

operating

level

of

the

PREAMP

OUT,

POWER

AMP

IN,

and

POWER

AMP

THRU

jacks.

When

using

the

effects

loop

option

this

switch

should

be

set

to

the

highest

possible

level

for

best

low

noise

performance.

This

is

done

by

first

setting

the

switch

to

LOW/16dBv,

second

set

the

front

panel

amplifier

operating

controls

for

normal

playing

levels,

then

patch

in

the

desired

effect

units.

(If

the

effect

units

have

gain

and/or

output

controls,

set

these

for

"unity

gain"

through

the

effect

unit,

this

is

verified

by

alternately

plugging

in

and

unplugging

the

effect

unit

output

from

the

POWER

AMP

IN

jack

and

listening

for

any

change

in

volume.

When

the

effect

unit

is

set

for

"unity

gain"

there

will

be

no

noticeable

change

in

level.

With

some

effects

it

may

be

necessary

to

do

this

in

the

bypass

mode

of

the

effect.)

Next

set

the

LOOP

LEVEL

SWITCH

to

the

highest

setting

that

will

allow

clean,

distortion

free

operation

of

the

effect

unit.

Now

with

the

effect

in

the

bypass

mode

once

again

check

for

"unity

gain"

with

the

procedure

outlined

above.

If

the

effect

unit

is

clipping

on

loud

passages

the

switch

should

be

set

to

the

next

lower

setting.

NOTE:

When

slaving

amps

the

LOOP

LEVEL

SWITCH

on

all

amplifiers

should

be

set

to

the

same

position.

F.

OUTPUT

BIAS

ADJUST

-This

trim

adjustment

is

used

to

set

the

bias

on

the

output

tubes

in

con-

junction

with

the

two

bias

test

points.

This

adjustment

is

made

by

connecting

a

digital

volt

-meter

to

the

two

test

points

labeled

BIAS.

Use

the

most

sensitive

DC

Volts

scale

and

adjust

the

voltage

between

the

two

test

points

to

.04

VDC.

This

calibration

should

be

made

after

the

amplifier

has

been

allowed

to

warm

up

for

at

least

two

minutes

and

prior

to

the

balance

calibration.

(NOTE:

If

tubes

won't

bias,

replace

6L6

-GC's.)

G.

TEST

POINTS

-Used

to

measure

tube

bias

and

balance

with

a

digital

voltmeter.

(See

F

&

H).

H.

OUTPUT

BALANCE

ADJUST

-This

trim

adjustment

is

used

to

set

the

balance

between

the

push/pull

sections

of

the

amplifier

in

conjunction

with

the

two

BALANCE

test

points.

This

adjustment

is

made

by

connecting

a

digital

voltmeter

to

the

two

test

points

labeled

BALANCE.

Use

the

most

sensitive

DC

Volts

scale

and

adjust

the

voltage

between

the

BALANCE

test

points

to

0

VDC.

This

calibration

should

be

made

after

the

amplifier

has

been

allowed

to

warm

up

for

at

least

two

minutes

and

after

the

BIAS

calibration

is

performed.

(NOTE:

If

tubes

won't

balance,

check

bias

and/or

replace

6L6

-GC's.)

Only

make

adjustments

to

bias

and

balance

when

necessary.

If

you

are

not

sure

about

using

this

feature..

.

leave

it

alone!!!

I.

FOOTSWITCH

JACK

—Plug-in

connection

for

remote

footswitch

to

activate

Channel

Two

when

in

the

Channel

-Switching

mode

and

to

switch

the

Reverb

on

and

off.

Fender The Twin Owner Manual - Page 5

Panel, Functions - amp

Page 5 highlights