DYNACO FM-5 User Manual

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The
Dynaco
FM"5
is
lhe
culntination
of mr.rre
than
{i
years
of
Dynaco
design
research
r+,ith
the
ilvorved
goai
of
exemplary performance
under
a
rvide
range
of recxtption
conditions
at
rnodest
cost.
Its
compact
size
nonetlieless
provides
a
generolrs
la-vout
for casv
kit
cori:;tnrclion
ancl
outstanding
serviceability.
In
additjon.
an
t
xt:cpti,ural
cle-
gree
of flexibility
has
treen
desiqned
inr.o
this t_urrr:r
{or
future
contingerrcies.
-
The
availability
of an
auxiliary
high
level
input
tirrorrgh
the
tuner's
volume
control
enables
tape
pla-yback,
for
ex_
ample, with
just
a
power
ampiifier
and
speakers.
Alterna_
tively,
an
accessory
phono
preamtr)
module,
.l!I<x_lr:l
pPM-s,
will
be
offered
fr:r
the
I'M-5
so that
the
ALjX
1;csition
will
accomrnodate
a
magnei,ic
r:artridge
inJrut.
In
ih"
.lir-
tant
future,
if
a cxrmlratible
s.ysteltr
of
4.r:lr;lrrntrl
rnulti-
plexing
is
approved,
it
is
possible
th:rt
the
lrovror
suJrply
and
space
allocations
will
accornnlodatc
it.
:inrJ
thr,
rri,es_
sary a'-rdio
outputs
are
available.
The
primary
consideration
in
the
devekrirrletrt
of
cach
new
Dynaco
product
is
exceptional perf'orrnani;e.
T.he
lrM-5
delivers
this in
full
nrea|;ut"{r.
'I}rer
ticrilgn
consirtera_
tions
necessar-y
to
achieve
a
lrrr,lrriunr
t1u;rlit";
kil
lr,rrd
automatically
to
a distinctly
sulx.rioi"
firctor",
:r:;setribled
unit
as
well.
I'he determination
of the
best
IrM ltrrrer
design
for
maximum
listening
enjoyment
is
n<lt
onr.l which
c2lri
be
made
entirel.y
in
the laboratory,
nor
c:rn
it lxr
full-y
definerl
by
specifications.
Extensive
field
testing
is
a vilrl
nart of
tuner
design.
Reception
conclitions
vitr.y s()
gr.eutlr.
that
certain
characteristics
which
favor
recerrtrtrir
in
sj()rne
instances
nlay
prove
a
lrandir.ap
rrrrrler
rlifft,rent
eircurn_
stances,
Side by-side
listening
comlrarisons
of
the
FM_5
with
tuners
several
times
its
cost demonstratc
the
IrM_5's
ability
to reject
the
pc'rvasive
t-fi'ects
of iiiultipath
dis_
persion
on
strong
urban
signals,
as
well
as
to
clcarlv
receive
weak
or distant
signals
without
noise
or interfei_
ence.
A tuner
can, however,
onl-v
prccess
the
si6lurl
it.
receives
from its
antenna.
The
lrrogrer
anl.entra
is
ttrus
a
vital
adjunct
to
your
music
system.
A section
of
this
manual
gives
some
suggestions
in
this reganl,
but
cornpe_
tent Iocal
advice
which
takes
into
accourrt
ihe
part,ictilar
Iocation
of the
tuner
will
always
be
aclvantasr:ous.
Vanishingly
low
distortion
has
always
been
a hallrnark
of
any
product
bearing
the
Dynaco
name.
,fhe
I'M-5
establishes
new
standards,
not
only
for
tylrical
in-phase
stereo
measuremenls,
but for
signals
of
dissimilar pirase
characteristics
as
well.
Coupled
with
out,sLanding
phase
integrity
in
a solid
state
tuner,
this
yields
*:xen4,lary
results
with
any
of
the matrix-type
4-Dimensional
(some_
times
incorrectly
called
4-Charrnel)
broadcasl.ing,qysterns
now
proposed,
including
the
ingeniously
sinrptc
IIyNA_
QUAD'*
system
developed
by Dynaco.
Any
successful
high
performance
audio
kit
design
inust
concomitantly
deliver
unchanging
results
ovnr
extended
use.
This
also implies
assurance
that
the
standards
set
bv
the
factory
assembled
units
are
consistentiy,
rcproducibll
when
even
a novice
properly
assembles
the
kit.
The more
than
15
year
old
Dynaco
reputation
for
consistentlv
meet-
lng
conservative,
detailed
specifications
is
your
best
guar_
antee that,
the
FM-5
will
do
just
that.
The
two
fiberllass
etched
circuit
boards
and
the
front
end
assembly
twirictr
contain
all
of the active
circuitry)
have
been
cimpletely
tt:sted
and
aligned
as
a
nratched
set.
for
the
kit,
leaving
notlring
but
their
interconnec:tion
for
the
liuilcl'er.
Th;
excellent
specifications
of
ther
FM_5
art:
possible,
and
guaranteeable,
rrnit
to
unit,
lab
model
to
pioduction
kit,
because
of the
extraordinarv
unifornrity
which
etched
cirj
cuits
provide,
and
the
inherent
si,abilitv
of
the
circuit
confiElration.
The
capability
for
the
finest
perfornrrnce
is
of
little
value
if
it
cannot
be readil.y
utilized
in
norrnal
use"
'fhe
consummate
oJrerating
ease
of
the
IrM_jj
is
a
case
in
point.
You-
simply
Leke
your
h:rncl
off
the
tuning
knob
as
soon
ers
the
TtiNED
indicator
is
illuminated.
The
exclusive
nvnar.uun'-
circuit
automatically
fine_tules
thc
station.
A
stereo
broadcast
will
automatically
switch
the
tuner
to
stereo
reception,
and
light
the
STEREO
indiurtor
loo.
fhe
FM-i-l
actually
exceeds
its
own
IHI,. s;;ecifications
when
it
colnes
to
listenable
results.
The
IHIr
pror:erclure
for
determining
the
distortion
specification
of
a
tuner
allows
readjustrnent
of
the
s()urce
signal
for
the
lowest
measurable
distortion.
you
the
listener
cannot
rio
this.
In
the
past
-you
have
had
l.o
rely
on
the
uncertainty
of
"center
of
channel"
meter
s.ystell)s,
ot.
on
llre
even
less
;rrecise
signal
strength
maxima
inrlir:ations-
I'tre
certainty
.f the
rryNaruNe""
circuit
autom.tic:rlly
.lirninates
thesl
variables,
assuring
reception
with
the
lowr:st
possible
dis_
tortion.
The
oyNa,rul.tr,,"
logic
circuit
senses
ilr.
yr.""..rce
of
the rlesired
signal,
together
with
the
absence
of
noise,
befcrre
it
will
switch
on
the
audio.
Then
it
automatically
fine-tunes
to
the
exact
center
of
the
IrM
channel
(the
min_
imurn
distortion point)
in
either
mono
or stereo.
Such
pre_
cise
tuning
is
accomplished
faster
and
more
accurately
tiran
any
other
tuning
system.
A
clearly
audible
virtue
of this
design
is
the
total
elimi-
nation
of switching
transienls
in
tl.re
operation
of
the mut_
ing
function.
And
you
have
the
convenience
of interstation
muting
down
to
the
levels
of the
weakest
useable
signals_
in
the
vicinity
of
4 microvolts!
'Ihe
result
is
absolute
silence,
-<rr
the
station
in
correct
tune.
Only
the
tr'M_b
achieves
this
ultimate
goal
of
a tuner.
This rehned
muting
circuit
eliminates
the
possibility
of
damaging
speakers
oi
solid
state
amplifiers
as
a
result
of
the low'frequency
"thumps"
so
comnlon
in
the
past
with
raprd
dial
ma"ipu_
lation-.
Yet
so
sophisticated
is
it.s
operation
thut
selectivity
of
adjacent
channels
is
completely
unaffected.
In
urban
locations
where
the
FM-5's
extreme
sensitivitv
could
have
been
a handicap,
speciai
care
was
taken
in
thl
design
of
the
front
end
to
accommodate
extremely powerlul
signals
without
encroaching
on
adjacent
weakei
channels.
The IM-5's
suppression
of
spurious
responses (cross_
niodulation)
is notable
among
solid
state
tuners.
Generous
tolerance
of
overmodulation
(
an
al
l
-too-conrmon
trroadcast-
ing
fault)
yields
low
distortion
signals
in
instances
where
others
suffer.

DYNACO FM-5 Specifications

General

Brand	DYNACO
Model	FM-5
Category	Tuner
Language	English