Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Instrukcja Użytkownika Pobierz pdf (Strona 61)

CAR STEREO

IN YOUR

HOME*

By

Greg Swain

Adapt that orphaned

car

radio -cassette

player

for in -home use

THOSE OLD

VACUUM -"lUBE SE

:S SURE IIAD A PRETTY

good sound -much

better than

what

you'd get

from

transistor

radios.

When was

the

last time that you

heard

that sort of statement? But don't

dismiss it as mere nostalgia.

Those old tube

sets really did have the edge

over the familiar

"cranny"

(transistor radio), at least in terms

of sound quality.

The masons are

not hard to find. Compared

to

modem

transistor radios, those old

vacuum -tube sets boasted greater

power

output, better bandwidth (i.e., they

reproduced

a

wider range of audio frequencies),

better AGC,

and lower

overall noise levels.

They also usually had a

decent loud-

speaker to reproduce the

sound.

Take a look in the back

of one of those old tube

radios and

you'll invariably

notice a big speaker,

often 6 or 8- inches

in

diameter.

What's more, because the

chassis

was quite large,

the cabinet

was

also

quite substantial and

could provide a

fair

amount of baffling for the

speaker.

The signal -handling capabilities

of

vacuum

tube

sets

was

better

too. They could

comfortably handle

very-high input

signals -the stuff that

makes the audio

output of

many of

today's solid -state

stereo systems

sound like someone's

fry-

ing an egg -without

overload or cross

-modulation,

and had

much better automatic

-gain control

(AGC) circuits

to cope

with

the

wide range

of signal -strength

variations.

These days, bandwidths

are much

narrower, the

baffling is

woeful,

and the

miniature

speakers used sound dreadful.

Add

to that the overload and

distortion problems

inherent in lower

-

power, audio -output

stages and it's

not hard to see

why

modern table radios don't

measure up to

the

vacuum -tube

sets of yesteryear.

The fact is, you can no longer buy a decent

table -type

radio. All you can get

is boom -box style

radio /cassette play-

ers,

which

can be quite expensive;

or cheaper

clock/radios,

which can sound really

brutal. But there is an

alternative:

adapt

a car radio to run

off

the

117 -volt mains

for in -home

use.

Car Radio Conversion

This is

such

a

ripper of an

idea

that you'll

wonder

why

it

hasn't been done before. (It

has -you've

simply slept past the

first go-

round.) As

will

be

shown,

converting

a

car radio to

run off the

mains is quick and easy

to do. What's

more, you

can spend as much

or as little as you like.

What

are the advantages

of car

radio conversions?

First,

car radios offer

much better station -pulling

power and

sound

quality than

virtually any currently

available domestic

AM/

FM

radio, regardless

of price. Because they

are designed

for

mobile use, car radios

have much

better sensitivity

selec-

tivity, and

better bandwidth.

Second,

car radios incorporate

desirable extra

features

not

usually

found on

domestic radios. Many

have pushbutton

station

selection,

which is

a great

convenience

feature,

while

upmarket

models

feature synthesized tuning,

digital

frequen-

cy- display and

memory storage

of favorite

stations.

'This story

first

appeared

in

Silicon

Chip,

Nov. 1987;

reprinted with

permission.

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