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fit

 

or

 

remove

 

it,

 

as

 

the

 

guide

 

is

 

Bakelite

 

and

 

is

 

easily

 

broken

 

off.

  

This

 

will

 

not

 

affect

 

the

 

operation

 

of

 

the

 

tube,

 

but

 

it

 

makes

 

fitting

 

difficult,

 

and

 

if

 

the

 

tube

 

is

 

fitted

 

incorrectly,

 

amplifier

 

damage

 

will

 

occur.

  

Connect

 

the

 

amplifier

 

to

 

your

 

Hi

 

Fi

 

System.

  

If

 

in

 

doubt

 

as

 

to

 

whether

 

to

 

use

 

the

 

4

 

or

 

8

 

ohm

 

taps

 

on

 

the

 

amplifier,

 

start

 

with

 

the

 

8

 

ohm.

  

Just

 

because

 

a

 

speaker

 

is

 

rated

 

at

 

4,

 

6

 

or

 

8

 

ohms

 

does

 

not

 

necessarily

 

mean

 

that

 

is

 

the

 

load

 

seen

 

by

 

the

 

amplifier

 

when

 

playing

 

music.

  

When

 

the

 

amplifier

 

has

 

been

 

biased

 

and

 

is

 

warm,

 

listen

 

to

 

some

 

music

 

and

 

then

 

connect

 

to

 

the

 

4

 

ohm

 

taps

 

and

 

listen

 

to

 

the

 

same

 

piece

 

again.

  

The

 

one

 

that

 

sounds

 

fuller,

 

stronger

 

and

 

more

 

musical

 

is

 

the

 

correct

 

setting.

  

Having

 

it

 

on

 

the

 

incorrect

 

taps

 

will

 

not

 

damage

 

the

 

speakers

 

or

 

the

 

amplifier.

 

 

Biasing:

  

The

 

biasing

 

on

 

the

 

amplifier

 

was

 

reduced

 

prior

 

to

 

shipping

 

as

 

a

 

safety

 

measure.

 

Once

 

the

 

amplifier

 

has

 

been

 

on

 

for

 

a

 

while

 

and

 

is

 

fairly

 

warm,

 

connect

 

a

 

Multimeter

 

to

 

the

 

red

 

and

 

black

 

biasing

 

terminals

 

on

 

the

 

right

 

side

 

of

 

the

 

amplifier.

 

(As

 

seen

 

from

 

the

 

front).

 

 

Set

 

the

 

Meter

 

on

 

DC

 

Volts,

 

and

 

adjust

 

the

 

screw

 

between

 

the

 

two

 

plugs

 

until

 

it

 

reads

 

2.2V.

 

Repeat

 

on

 

the

 

other

 

amplifier.

 

After

 

about

 

a

 

month

 

or

 

more

 

of

 

running,

 

or

 

about

 

200

 

hours,

 

check

 

and

 

reset

 

the

 

bias.

  

After

 

this,

 

there

 

is

 

no

 

real

 

need

 

to

 

keep

 

checking

 

it,

 

unless

 

the

 

tube

 

is

 

replaced,

 

as

 

the

 

bias

 

will

 

naturally

 

drift

 

as

 

the

 

tube

 

ages.

 

 

These

 

amplifiers

 

give

 

off

 

quite

 

a

 

lot

 

of

 

heat,

 

so

 

please

 

ensure

 

that

 

each

 

one

 

has

 

adequate

 

ventilation

 

 

Warranty:

 

 

The

 

warranty

 

on

 

all

 

AM 

products

 

is

 

two

 

years

 

parts

 

and

 

labor.

  

The

 

amplifier

 

must

 

be

 

returned

 

to

 

the

 

factory,

 

or

 

to

 

the

 

dealer

 

from

 

which

 

it

 

was

 

purchased,

 

or

 

to

 

a

 

repairer

 

authorized

 

by

 

the

 

factory

 

or

 

the

 

dealer.

 

The

 

warranty

 

on

 

tubes

 

is

 

3

 

months

 

from

 

purchase.

  

If

 

a

 

tube

 

lasts

 

3

 

months,

 

then

 

it

 

is

 

most

 

likely

 

to

 

last

 

the

 

normal

 

life

 

cycle.

 

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