Harman Kardon 730 User manual

harman/kardon 730
twin powered receiver
owner's manual

INTRODUCTION
-
Your investment in a component high fidelity system indicates you have a more than
average interest in music. The fact that your investment includes a Harman/Kardon receiver
shows us your appreciation of uncompromised reproduction of the music you enjoy.
Throughout the design and manufacture of this receiver, we have made every effort to
assure it will meet all of your expectations. We are confident the 730 will do this if it is properly
connected and its controls and features are clearly understood. This manual will serve as a
guide to the connection of the 730 and the expert use of all its controls.
We understand your desire to have the 730 operating in the shortest possible time, so this
manual has been organized to make the installation procedure rapid, simple, and accurate.
We believe a comprehensive understanding of the various controls and features of the 730
can best be obtained when you can hear their effects as we describe them, so this manual is
organized in that way.
Read each section of this manual completely before you begin to make the connections or
control adjustments that section describes. You will make the right connections or
adjustments the first time you attempt them and thus shorten the process of installation.
Warning: To prevent fire or shock hazard, do not expose this receiver to rain or moisture.

CONNECTING THE 730
E3efow procc,ecJ111Q wrth the connection
ul tric, 730 there 1s one other 1tern that you
sliould take care of Since you Iiave 1ust
purchased the unit you should still have
tlie bill of sale. Make sure 111s clc,arly
markccJ show111g the cJate of purchase
Now look on the mar panel of the 730 and
1ocate the serial nwntJcr Record this
rwmtJcr or1 the tJ1II of sale and tlien put rt
away 111 a safE, place for future refere11ce
T111s number wrll be 1mporta11t 11 your u111t
requires warranty service It may also
prov-ca useful 1cJc11t1f1cat1or11f your urnt
becomes sub1ect to theft
On tlie rear par1el ol trie 730 yo,, will
f111cJ m1mero11s receptacles. a:I clearly ancJ
specifically marked w1t11 1de11tify111g
legends. Each ol tl1ese will tJe dealt w1t11 111
t11rn For the moment. leave the power
cord of tl1e 730 unconnected. Place tl1e
730 on a shelf or table. or or1 t11e tloor near
wliere 1t will finally be placed wtien you ve
completed tile connections. You st1oulcJ
leave enougl1 working space armmcJ 1t so
you can make your corinect1or1s easily
and comfortably
Although tile 730 1s a solid state
device. its powerful amplifiers arid even
dial scale illum1nat1on lamps will generate
l1eat. The 730 1s designed to operate
eff1c1ently over a wide range of ambient
temperatures. but the l1eat 1t generates
must be allowed to escape to prevent
internal temperatures from r1s1ng too l11gh.
Adequate vent1lat1or1 must be provided. If
the 730 will operate on an open shelf, no
special precaut1or1s 11eed be taken. If a
shelf will exist atJove tlie 730. allow at least
1" to 2" of free space above the receiver. If
the 730 will operate 1n a 3 or 5-sided
(bottom, back. top and sides) closed
space. at least 2" to 4" of free space
sliould be allowed above 1t and to e1tl1er
side. In custom-mounted cabinet
installations. adequate air flow can be
obtained by dr1ll1ng a large cutout, or.
several small lioles. 1n tlie surrounding
cabinetry. both above and below the
receiver (not 1n the 730 housing I 11) Open
back custom installations require no
special attention. Finally. free air flow
t11rougl1 the bottom of tlie receiver must be
allowed Never operate the 730 on a rug
or cushion that could prevent air from
entering the bottom of the receiver.
SPEAKER SYSTEMS
Preparing for Connections:
Cl1oos1ng tlie r1gl1t wire for connecting
your speakers to the receiver will assure
the best performance. We recommend
use of 18 gauge. strancJed. two-conductor
wire. This type of wire 1s often called lamp,
or zip.· cord and 1s available at most high
fidelity stores or any electrical supply
store Wire of 18 gauge 1s thick enough to
allow lengtlis of up to 50 feet to tJe used
w1t11out affecting tl1e low frequency
performance of your system. For longer
runs. we suggest thicker 16 gauge wire If
t11e lengtl1 of wire you need 1s relatively
short. you may use t111nner 20 gauge wire
for your 1nstallat1on. althougl1 18 gauge
wire 1s preferred
Lamp cord 11s11ally provides a· code'
wl11ch 1s a means ol 1dent1fy1ng tlie
conductors. On some brancJs tr1e
1nsulat1on surrounding one of tlie
conductors lias a rib. sliarp corner (see
•a"). or 1ndentat1ons molded along its
lengt11 (see "b ') on otliers a t111n colored
t11read 1s molded 1ns1de tl1e insulator along
w1tl1 one conductor (see c ') In still otlier
tJrands. tlie two coriductors are different
colors (see· d") S11cl1 wire will be very
useful 1n "pl1as1ng· your s1Jeaker systems
Ci1t two lengtlis of wire ol
approximately eq11al size. Bot11 sl1ould be
long enougl1 to comiortably reac
1
1 tne
s(ieaker t11at will tJe at t11e greatest
distance from tlie 730 Separate tlie
conductors at eacl1 end of tiie wire
segments a distance ol about 2-3". t11en
carefully remove about one-l1alf 1nct1 of
1nsulat1on from eacl1 free end Twist me
strands of eacl1 cond11ctor so tr1ey are
smoot11 and tight without any loose
strands

Connecting Speakers to th e 730:
Fr nd the ro w of four connectors on the
back panel of the 730 marked SPEA KER
SYSTEM 1. Starting with either LEFT or
RIGHT pair of connecto rs ,push firmly 1n
on the plastic head of each connector,
revealing an opening. Insert one bare
conductor at th e end of ea ch of th e
le ngths of wire you've prepared in to each
connector. Release the co nnector. Ea ch
conductor should be locked firmly in
place in it s own connector. Ta ke the end
of this wire and connect the bare
conductors to the two ter mi nals of one of
your speakers. Now (t his is important)
no te to which connec or (red or bl ack) on
the 730, and to w hi ch speaker te rminal,
the coded side of the wire is connected
Connect the second speaker to the ot her
two connecto rs un de r SPE AK ER
SYSTEM 1, being sure the coded side of
I is wire is connected to both the 730 and
th e speaker in th e same way as he first
wire. The lef t cha nn el connec ti on should
be made to t11e speaker placed at th e left
side o your lis te ning area.The right
c ha nnel connection sh ou ld be made to
th e speaker placed at th e righ side of
your li stening a rea. Be certain [very
im po rta nt ] all th ese connections are tight
and that all th e strands of th e wires are
fir mly seated in th e co nn ectors of th e 730
an d under the terminalsof yo ur speaker
systems. Any loose st rands of wrre could
touch other termina ls and cause short
circ ui ts,which might cause the speaker
circuit brea ke r to op en .
II you have fo ll owed these directions,
your s eakers w rll be p ro perly "p hased."
We w il l describe how to check this by ear
when the other connections are
completed and your system is operating.
Note : Two equal lengths of wire are
suggested to prevent an y imbalance in
the sy stem, even if one speakerwill be
quite close to the 730. La ter, w en you put
the components in your system into their
final position s, you can neatly co il any
excess wire and place it in conspicuously.
If ,now or late r, you wish to connect a
second pair of speakers, you can use th e
SPEAKER SYSTEM 2 connectors of the
730, fo ll owing the procedure outlined
previousl y. The speaker in your system
sh ou ld ALL ha ve a rated impedance of 8
ohms or hi gher.·
A lth ough your 730 l 1as been designed
fo r use with spe kers with rated imp ed-
ances of 8 or 16 chms, the 730 can
acco mmodate ON Ep arr of 4-ohm
speakers more than adequately.You
should no t. however, use mo re than ONE
pair of 4-ohm speak er s. Dama e o the
730 co uld re sult from such us e.

TURNTABLES OR
AUTOMATIC CHANGERS
The 730 has provision for connecting
two re co rd playing unit s. All record
playing units pro vi de two or th ree cables
(aside from the power cord) for connec-
tion to th e 730. These are t he left and right
channel signal cables and the ground
connection. (Some turntables combine
t he ground connection wi th one of the
signal ca bles.) The two signal cables are
usually identified as "left channel" and
"rig ht channel" by a color code or tabs, or
the channel identifications are molded into
the insulators around the pin-type RCA
connectors. Determine which of the
cables is left and which rig ht and insert
them into th e two corresponding
receptacles on th e rear panel of th e 73 0
marked PHONO 1. Press them in as fa r as
they wi ll go so they a re seated snug ly .
If a separate ground wire 1s pro v· de d,
connect its lu g or s tr ipped end under the
knurled nu tmarked GND on the rear panel
of the 730. The phonograph sign al
connec ti ons are now co mp lete.
If a second re cord pl aying u ni t 1s lo be
u se d connect it to th e PHONO 2 inputs in
the sa me man ne r as th e fi rs t un it was
connected to PHONO 1.
Note: The 730 is designed to operate
with a hrgh quality Magnetic car rid ge. If
yo u purchased our 730 and t rn b ie
separately,be sure the turn able is
equipped ith cartri dge of this typ e.
lnser t e AC power cord of your
urntab le into the AC rec ep tac le marked
UNSWITCHED on the rear of t~ 1e 730.Th is
re ceptac le is " Ii e" so long as the 730
itself is connected to a live AC outl et ,
regardlessofwhether the 730 is itself
o erating. Yo ur turntab le or au tomaf c
changers o ul d be co nnec ed to his
receptacle.
FM ANTENNA CONNECTIONS
A "T"-shaped, folded dip ole antenna is
provided with the 730 for FM reception.
However, FM performance of the 730 will
be greatly enhanced if it is connected to
an outdoor antenna system. Many
apartment buildings in urban areas
provide a mas ter antenna system for
television reception which c an often be
used for FM purposes. In some suburban
and rural areas, cab le television systems
exist that ca n also beused for FM
reception. In fa c t, television antennas on
private houses are often good for FM
reception.
Two types ofwire, 300 ohm and 75
ohm, are used as lead- in for outdoor
an tenna systems. Eith er type can be
co nn ected to the 730.Find the three-
connector terminal strip on the rear panel
of the 730 marked ANTENNA
If your lead-in is 300 ohm, it wi ll be a
very flat wire with a conductor at each
ed ge . Carefully cut about 1 ½" of the
insulation material from the ce nter of the
lead- in without damaging either
conductor.Strip o ff about ¾" of insulation
from each co nductor an d co nnectone of
them to each of th e terminalson the three-
connector ANTENNA strip under the
bracket labeled 30 0!1 .(The term "ohm"
and the symbol • ff ' ha ve equivalent
meaning .)
If your lead-in is 75 ohm, you must
use a matching transformer. The lead-in
wire will be a single round wire with a
termination consisting of a me tal
connector with a short length of bare,
solid,copper-colored w ir e protruding
from it s center. This co nn ector is inlended
to be joined to a 75 !1 to 300 !1 matching
transformer These tr ansformers are
inexpensi ve and available at many
le levision or electronic parts s upp ly
stores Once they are j oi ned lo the lead-in
they provide two 300 ohm conductors hat
are connected to the 730 as described
above. If your 75 !1 lead-in has a bare en d,
the appropriate connec tor must be
attached to it so that you can use a
·matchi ng trans fo rmer.
Where there is only one lead- in nd it
must supply sig na l or bo th a television
re ceiver an d th e 730, a signal splitter"' or
·· 2-set coupler" c an be use d. Consult your
high fi de l it y or tel e vi si on dealer for
in fo rmati on on such devices
If no outdoor antenna is available to
you, connect th e lugs of the dipole
antenna to the 300 !1 t er minals
Th e dipole antenna wr ll perform best if
its ar ms are car fully x ten ded in a
straight l rne horizon all y, and the en ti re
an te nna fi xed to aw II or ta cked to the
ba ck of a shell. Di poles are most sensitive
on the ax is perpendic ul ar to the pl an e of
th e two arms so an te nn a position is
importa nt for optimum r cep t1 o n.
AM ANTENNA CONNECTIONS
A ferrite loops ti ck AM antenna is
provided on th e rear of the 730, which writ
yield good reception in many areas. It ca n
be orien ed to improve reception of dista nt
stations. The third te rminal of the AN TE N-
NA s tr ip is connection for ··i on ir e"
AM anten na . AM reception over ex remely
long distances can be obtai ed with a
well-designed long wire ante, na. Ma ny
hi gh fideli ty dealers, especially those wh o
have experience with amateur and
sho rt wave radi o, c an help you wi th long
wire AM antenna sy st em
WARNING: DO NOT MISTAKE THE
FERRITE LOOPSTICK AM ANTENNA
FOR A HANDLE. IT S BRACKET
CANNOT SUPPORT THE WEIGHT OF
THE 730. THE 730 SHOULD NEVER BE
LIFTED, PULLED, OR PUSHED BY
GRIPPING THE AM ANTENNA.

CONNECTING TAPE
EQUIPMENT
The 730 provides facilities for both
re cording and play back of tape programs
to and from open-reel, cassette or ei ght-
track ca rtridge equipmen t. Using the
signal cabl es provided with yo ur tape
deck or recorder, connect the left and
right channel TAPE 1 receptacles (und er
the bracket labeled OUTPUTS) on the
rear pan el of the 730 to the corresponding
input receptacl es of your ta pe equipment.
The 730 provid es outputs f or two tape
recorders.
If you r open-reel or cassette equipment
offers tru e off-tape monitoring faci li tie s,
the left and right channel ou tput
receptacles of your tape equipment
sh ou ld be connected to the
corresponding tap monitor (TAPE MON-
1, TAPE MON-2) re ceptacles und er the
bracket labeled INPUTS. Most cassette
recorders and many open-reel un its do
not offer true ta pe monitor capabili ty .
However, the ou tputs of these machines
may s til l be con ne cted to the tape monit or
receptacles of th e 730. Tape equipment
cap able of playback o nl y, can be
connected to either tape monitor.
The remaining SWITCHED AC
OUTLET on the rear of the 730 can be
used to provide power for your t pe dec k
or recorder This outlet 1s · ·1i ve" only wh en
the 730 is operating If you wi sh, th e
power switch o your tape equipment m y
be left in th e " on " position -power to it
would th en be contro ll ed by the POWER
switch of the 730. If you use th is rn 1tl e t. be
su re the re corder's drive s ys t em 1s
disengaged before y ou switch the 730 off.
OTHER EQUIPMENT
Pr ovision is ma de at ti e rear of the 730
to connect a ny equipment designed to be
installed b et ween the preamplifier and
power amplifier. To use this feature simply
disconnect the patch cords from th e
MAIN AMP IN and PREAMP OUT Jac ks
and follow instructio ns su p pl ied with t he
accessory equipmen t.
NOTE: Wit h no accessor equipment,
patch co rds M US T be instal fe d to use the
receiver
Tw o pair of a ux iliary in pu ts (AUX 1,
AUX 2) al so are available at th e rear of the
730 to connect any h1g r1 level· output
eq ui pment. A special tu ner for long wav e,
marin e, aircraft, or c1t 1z n· s bands, e tc,
may be connecte d- or y ou m y choose
to connect a secon tape recorder or the
ou tp ut of t1 1e au dio section of telev is io n
re ceiver. An y number of choices is
available. Co su it your de aler f or
information as to wh at equi pm ent is
compa ti ble wi h the electric al
requirements of the AUX in puts of the 73 0.
If you have notused th e SWITCHED AC
OUTLET for a tape recorder. you can use
it fo r acc esso ry equipment
The co nn ections at the rear panel are
now complete Pla ce the 730 in its fi nal
position and insert its AC power plug in to
a convenient wall ou tle t.

OPERATING THE 730
p(; ,\~
-r )
1" )
,
(j l l
r,
POWER
Fa m1l 1ar 1ze yourse lf wi th lhe front pan el
conlrols There ar esix knobs and t en
pushbuttons controlling th e functions of
th e receiver. E· ch con rol p er forms a
dilfer en t fun ction. But instead of
discussing ea ch control separatel y, we
wi ll illustrate how lhey work together to
control th erep ro duc ti on of sound through
the 730. Fin d the VOLUME contr ol and
turn it down (counterclockwise). Push th e
POWER switch to turn the 73 0 on. The red
power in dica to r wi ll lighl.
Playing Records wi th the 730
Fou r basic con tr ols are used to play
back disc recordings through the 730
FUNCTION, VOLUME, BALANCE, and
SPKRS-1, Make the following
ad1ustmenls to these conlrols after
activating your turntable or record
changer
[ ] SPKRS -1 -On (push ·in'')
[2] FUNCTION -Phono 1position
[3] BALANCE Neutral posIt1on
(1 2 ocloc k)
(4] VOLUME -Adva c (clock wi se)
o comfortable
l ou ne ss level.
You should now hear sound from lhe
disc th rough your s stem To increase or
decrease he loudness of he playbac ,
the VOLUME contra ma be advanced
(clockwise) or turned down
(counterclockwise).The BALANCE
control ii turne counterclockwise 111 shift
the loudnes to the left spe er by
attenuating (reducing the oudness) th e
right speaker When turned 1n he o her
d1rec ion, it has t11e opposite effect. The
SPKRS-1 oushbutt on connects or dele ts
the speak rs co nnected to SPEAKER
SYSTEM 1 [ II you h e speakc s
connected to SPEAK ER SYSTEM 2, they
are contro ll ed by the SPKRS-2
pushbutlon on t1Ie front panel).
r
If you do not g et sound at Ih 1s po in t,
check th e on tr ol osit io r s given.Also, be
sure th a bo th ape monitor switches ar e in
the· out" position. Leave the vo lu me
control at th e 9 o· c 1oc k position while you
a re ad 1u s ti ng th e o he r con rols. If y ou still
g et no s ou nd,check the back pan el
c nnectio ns for PHONO, then c eek th e
turntable itsel f.
Note: Whenever you check
connections at the back panel, always
push the POWER switch off.
Now hat you're listening to sound y ou
can check the phasing ofyour speake rs.
While pl y in g as er o disc, depress the
MONO pus hb utton swilch and position
your se lf midway between the l ef t an d right
speak r systems. fa c in g them. Th e source
ofs ou n sl 1ou ld now appear to be co ming
from a po int d ir ec ly ahead of you,
cenler ed between the two speakers. If the
sound h as no cle ar cu tcentered image.
y ou did not connect he sp aker sys em s
correctly. Push the POWER switch off
Recheck your connections bolh at the rear
of th e 730 nd at lhe te rminals of bott1
spea ke rs . If you are using wo dissimilar
speakers. it is possible th t their 1n lernal
connections have oppo site polarily,
c a1Js1 11g hem to e out ol phase. Reverse
the connections made at the speak r or
he receiver (NOT B OTH ) for one channel
ONLY The system should now be in
p hasG .Push 1he MONO sw1 tcl1 to return it
I stereo (o t) positi on .
3 2
The phasing test can be done with any
program material, but disc recordings are
recommended. Stereo material is
suggested to make the effect more
obvious.
If at average li s te ning levels, you he ar
an objectionable (i e , easily audible)
amount of hum, tr y dis co nnecting the
ground wi re from the tu rnta le to th e 730.
Some turntabiei ca rtr1d ge combinations
actual ly produce less hum t hrs way.
Anot er source of hum is inadequate
seat in g of the inpu signal cables in he
re ceptacles o the 730 Check a ll cable
seating carefu ll y.

RECEIVING FM BROADCASTS
Five ba sic c on trols are used to receive
FM broadcas ts through the 730
FUNC TI ON, VOLUME, BALANCE, an
FM MUTING. Make the following
ad1ustmen s to these controls a ter
actI ating the SPKRS-1 switch:
(1] FUNCTION -FM
[2] BALANCE - Neutral (12 o'clock )
[3] FM MUTING - Out
[4] Tuning -Use this control to
mo ve the dial po int r
to the ex re me end of
th e dial scale
[5] VOLUME -Advance until hiss
is au di ble
[6] MONO -Out
You should now hear mild hi ssing or
r shing sound -this is tmospheric noise
p1c ke up by the tuner section. Depress
the FM MUTING button and the noise
disappea rs: it h s be en mu ted. Tu rn the
tu ning knob 11 1 either direction un ii a
broadcast signal is r ece iv ed. Th e FM
M AX Q UI ET meter should have deflected
and should now be registe ri ng the relative
quality of th e FM signal you are receiving.
No te that the me er de fl ects to the lelt in
an increasi ng deg re e as signal quality
improves. Maximum o bta inable deflec tion
to the left represents th e best listening
point.· If the broadcast is in stereo, th e red
STE RE O beacon Is lit: the beacon does
not light when an FM sta ti on is
broadcast in g monoph on ica ll y. If you have
a srereo station tu ned press th e MONO
switch in .
*Co ventional signa l streng h or cen ter
channel me ters sim ly in dicate the
s ength of a signal and pas s band
ccur cy. Harman Kardon·s extraordinary
Ou1e t1n g meter actually in dic ates he
si gn al-to-noise ratio or the qua lity of the
received signa l.
Th e 730 is now receiving the stereo
broadcast monophonic all y. In add iti on .
th e red STEREO beacon light is di sab led
This feature is useful f or weak stereo
stations where reception is accompanied
by a large amount of nois . The program
can be received monophon ica ll y without
the noise. Very weak monop honic stations
may be re ceived if FM MUTING is
defeated, but tu ning fr om station to station
is no longer noise-free.
The upper dia l sca le of the 730 is
calibrated for FM broadcast station
frequencies fr om 88 to 108 MHz. Each FM
station in your area has an assigned
frequency that Ialls within these li mit s. You
can use the illuminated dial pointer and
scale of the 730 to find any station in your
area if you know the assigned fr eq uency.
Similarly, the lower di al sca le is calibrated
for AM siations In your area. which have
assigned frequencies ranging from about
550 kHz to 1600 kH z. Note that when an
AM station is being tuned in the FM MAX
QUIET meter deflec ti on is from left to
right. In other words th e best listening
point is when th e meter is as far to the right
as possible. For convenience, a third
"logging" scale with arbitrary numbers
from 0-100 is provi ded so you ca n simp lify
the ask of memorizing the vari ous
assigned frequency numbers of the FM
and AM stations in your area. Witr1:he
logg ing sca le ,a ll you need remember is
that your favorite FM station is at 80 on the
logging sca l e, sel ec t FM, tune to 80, and
listen.
The p reced ing exa mp les give you a
working fam il i ar ity with the rImary
controls of the 730.
3
Muting Adjustment
The MUTE ADJ co ntrol on t he rear
pane l controls the signal th eshol at
which muting ac tion ta kes pace when t e
FM MUTING pushbutton Is activated.The
contro l has be n set at our fa ctory to
accom mo date the maj or ity of FM
reception co ditions. If you wish to
read 1ust this control, depress the FM
MUTING pushbutton and tune away from
any statio n. Turn t he MUTING ADJ co ntrol
un til the interstation nois ( hi ss)
d is appea r s.

0TH ER CONTROLS
By far the most frequently used
con trols are FU NCTION, VOLUME, and
POWER; but each of 11 ,e controls we
h vent y et mentioned l1a s a s pe c if ic
purpos e. Listen to their effect as we
desc ri be them.
TREBLE Raises (c l ockwis e) or lowers
(coun er cloc k w1se ) high freq 11 enc y
conten in prog rn material on both
cha nnels s1multaneousl Neutral position
is 12 o'cloc k.
BASS Same effect as TREBLE control
exce I works on low lrequenc1es
CONTOUR Works in coniunction with
VOLUME con tr ol to increase bass energ,
at low volume et tings Progressi el y less
effect as volume level is ncreased .The
CONTOUR switch has no effect at
VOLUME con tr ol settings beyond 12
o clock.
TAPE MON -1 ,TAPE MON-2 A m1
orograrns from any hie h level· sour ce
(usually ape recorder) c onnec e lo
TAPE ON recept cles They DO NOT
I ect signal ap earing at he TA PE
OUTPUT r eceptacle Thus. he use of the
TAPE MON switches does n ot disturb the
r ecording proces ol whatever source the
FU NCTION s it ch is set (Note If the rear
pa e TAPE MO inputs are u noccup ied
and either TAPE MON switch is
depressed no sound will be l1e ar .
regardless of the osition of l he
FUNCTIO switch The ame will be true if
the qu1pr enl conne le to the TA PE
O inpu ts is off) TAPE MO also allows
for connectio n of sig al processing
devices .
MONO Ch ng es a ny program from
stere op honic to mono phonic f ormat Also
processes any s in gle c nnel source
conne cted to single i np ut r ece t cle
(such a elevisio soun d) through BOTH
chann els D,sa les red STEREO b co n
li ght
HI CUT A filter to redu ce high f requency
co ntent of any prog ram material. Tap
hiss. re cor scratches and other
p ro bl ems found in p rog ram mater i al can
be eflect 1v ely reduc ed wit 1h1s switch.
LO CUT A f il ter to reduce low irequency
con en of any progr- m material Rumble
from your turntable (if present) oi other l ow
fre uency pr ob lems can be ef fectively
red uced w1 lh1s switch
PHONES Receptacle f or h ead p ones for
private lstenrng Doe s NOT autom ti ca ll y
defea t spe ak er systems. He a dp hones
can be u sed whether your s pea kers are
on" or· o ff "
FUNCTION Selects prog rams for
playb ck through sys t em Same s,gnal
a pp ears at bot TA PE O UT recep t ac les.
CIRCUIT PROTECTION
Two circu it breakers an d an AC power
fu se ar pro id ed to protect the 730. The
circui breakers are labelled SPEAKER
PROTECTOR and p otect th e mplifier
circuitry from external short circuits or
ot er con d1t 1o ns that woulcl c use
exces sive cu rrent to be drawn through the
amp li fi ers. If o ne of yo ur s peake rs st ops
reprod ucin~ sound first ch eck the
connections for that speaker, corr ecllng
any short rnc uil condilion.(Wire s tr ands
touching t he wrong terminal are the usual
cause ) Then lo ca te the circuit b re aker for
that channel. Press the reset button firmly
and release 1mmed1ately. DO NOT hold
button in.
The AC fuse protects the entire
rece iver rom ex cessive urrent hro gh
l he AC ower line. Should this f use lo
THEREP LACEME NTFUSEMUSTBE
PR ECISELY THE SAME TYPE AS THAT
SP EC IFIED ON THE RE AR PANE L.
USING ANY OTHER FUSE WILL NOT
P RO TECT THE 730: SERIOUS DAMAGE
TO ITS CIRCUITRY C AN RESULT.
CLEANING THE DIAL GLASS
Dust or sm udges can be remove fr om
the dial glass wi th a diluted l1qu1d glass
cleaner and a soft cloth or dam pa per
towel. DO NO Tuse a strong solvent- ty pe
c leane r or a mmonia as these may re mov e
the lettering on th e fa ce panel or clo ud th e
dial gla ss

730 SPECIFICATIONS
SPECIFICATIONS
Power Output
Power Bandwidth
Frequency Response
System Rise Time
System Square Wave Tilt
Total Harmonic Distortion
Intermodulation Distortion
(40 watts-SMPTE)
Intermodulation Distortion
(1 watt-SMPTE)
System Hum and Noise
Damping Factor (1 kHz @ 1 watt)
Power Amplifier Input Sensitivity
Power Amplifier Input Impedance
Power Amplifier S/N (40 watts)
Power AmP.lifler
Square Wave Rise Time
Preamp InputSensitivity
a. Aux
b. Tape Mon.
c.Phono
Preamp Input Impedance
a.Aux
b. Tape Mon.
c. Phono
Preamp Input S/N
a. Aux
b. Tape Mon.
c.Phono
Preamp HarmonicDistortion
Crosstalk
a.Aux
b. Tape Mon.
c.Phono
40 Watts Min. RMS per
channel both channels
driven into 8 ohms
from 20Hz to 20kHz,
with< 0.1%THO.
From 10Hz to 40kHz at
< 0 11 THO 111to 8 ohrris.
oat, cha1nels cJriven
simultaneously at
20 waits per cnannel
4Hz-130kHz±0 5 dB
1 5µ,sec
<5%
<0 1% from 250 milli-
watts to 40 wat:s RMS,
both channels driven
sirnu.taneously into
8 ohrns. 20Hz to 20kHz.
<0.12%
<0.15%
Better than 60 dB oelow
rateo output (unweighted)
>30
<1.2V
..
33 kilohms
>90dB
< 1.5µ,sec
<150mV
< 150 r'1V
<2.5 mV
30 kilohr1s
30 kilohms
47 kilohris
-77 dB
-77 dB
-72 dB
<0.15%
-47 dB
-47dB
-37dB
Preamp Output Impedance
Phono Overload
RIAA Equalization
Tone Control Action
a.50Hz
b.10kHz
Contour Effect (50Hz)
High Cut Filter(10kHz)
Low Cut Filter (50Hz)
FM Sensitivity
a. lHF
b. -50 dB (mono)
c. -50 dB (stereo)
Ultimate S/N
Capture Ratio
Image Rejection
Spurious Response Rejection
IF Rejection
AM Rejection
Alternate Channel Selectivity
MultiplexSeparation (1 kHz)
FM Harmonic Distortion (1 kHz)
a. Mono
b. Stereo
Pilot Suppression
De-Emphasis
Mute Level
MuteSuppression
Stereo IndicatorThreshold
a.
11
0ff"
b. Hon"
Audio Output
AM Sensitivity
AM Signal for 1 watt Output
AM Selectivity
Alternate Channel Selectivity
Image Rejection
IF Rejection
600ohrns
>95 mV
±' 0d8
±12 dB
± '2 dB
+ 10oB
-10dB
-6dB
1 9µ,V
3 5µ,V
35µ,V
70 dB
2 dB
-80 d:l
-80dB
-90dB
-60 ~JB
80dB
40 d:l
03%
04%
-55 ,iB
75µ.sec
Variaole
6508
0.5V
>250µ.V rn
<150µ,V r·,
35 dB
55dB
-75dB
-60dB
HulTl --40 dB
Dimensions 17"W x 14½"0 x 51/2"H
(43.2 cm W x 36.8 cm D
x 14.0cm. H)
Weight 28.6 pou1ds (13.7 kg.)