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WEBSTER

CHICAGO

BULLETIN

79P038

MODEL

80

MICROPHONES

The

most

common

trouble

with

the

crystal

micro-

phone

is

caused

by

letting

the

microphone

get

too

warm.

Temperatures

over

130

degrees

F.

cause

the

crystal

elements

to

soften

and

the

mi-

crophone

is

rendered

inoperative.

The

Webster-

Chicago Wire

Recorder

is

supplied

with

a

high

impedance

type

microphone.

Low

impedance

microphones (

35-50

ohm

and

200-250

ohm,

etc.)

may

be

substituted

by

using

a

match-

WRAP

THIS

CONNECTION

WITH

CELLULOSE

TAPE

10

INSULATE

FROM

GROUND

AND

OTHER

TERPIINAL

PIGTAIL

FROM

SI-IIELD

MUST

BE

GROUNDE_2I,---

-

TO

CORD

CLAMP

ing

transformer

between

the

microphone

and

the

input

socket.

Before

returning

any

microphones

to

the

factory

for

replacement,

check

the

connections

inside

the

plug

to

make

sure

that

they

are

not

shorted

or

broken

and

that

the

lead

to

terminal

No.

2

is

not

grounded.

If

terminal

No.

3

is

grounded,

the

wire

recorder

will

not

operate

in

playback

even

though

a

previously

recorded

spool

of

wire

is

on

the

machine.

PIGTAIL

FROM

SHIELD

SOLDERED

TO

GROUND

LUG -

NO

FRAYED

ENDS

Fig.

32 —

MICROPHONE

PLUG

CONNECTIONS

Do

not

remove

the

back

cover

from

the

micro-

phone

under

any

circumstances.

This

will

void

the

guarantee

and

Webster-

Chicago

will

not

credit

microphones

which

have

been

opened

for

any

reason.

If

the

microphone

proves

to

be

defective

after

the

plug

connections

have been

checked

and

found

to

be

correct,

return the

microphone

to

Webster-

Chicago

for

immediate

replacement.

24