Sansui 661 Brochure

Page 1

Strum»

661 FM/AM STEREO RECEIVER. 54 WATTS RMS When Sansur
announced the price of this revolutionary new FM/AM stereo
receiver. many high-fidelity experts were greatly surprised. just
as you were. The name Sansw has long meant innovation and
excellence in sophisticated audio electronics, But it has also
meant, usally. that any high-fidelity equrpment bearing the Sansui
name also carried an expensive price tag

But now thanks to a startling innovation called CBM [Circuit
Board Module) developed spectfically by Sansui for its finest pro-
fessional studio equipment, you can forget about price and con-
centrate on the outstanding Sansur quality and performance of
the all-new 661

This is a budget-priced stereo receiver that delivers expensrve
tonal quality and performance. Its power amplifier l5 of a very
advanced all-stage direct-coupled OCL design provrdrng RMS
continuous power 01 27 fully useable watts per channel ltotal
music power 110 watts) with a surprisrngly wrde power bandwrdlh
of 15 to 40.000Hz with very low overall distortion Its MOS FET-
equrpped tuner and highly versatile preamplifier and control sec-
tions with two stereo tape record/monitor circuits. stereo AUX
inputs and much more would normally mean afar higher price tag
Check out the details of these and other features of the Sansur
661-your best bargain in Sansui stereo excellence

Page 2

Sansuis 661 I'M/AM receiver is engineered
for excellence and priced for economy

IMPROVED PERFORMANCE AND REDUCED COSTS WITH SANSUI'S
CBM

Sansui's CBM ICITCUII Board Module) technique greatly Increases
electronic capability and dependability reduces Wiring and size and
srgnilicantly lowers the expense of quality-controlled mass-production ol
highly sophisticated electronic Circuns In turn. this means that the
construction and cha55is assembly of the 661 can be performed in less
time and at greater savtngs to you The 661 Incorporates Iour CBM units
one each tor its tuner. preamplitier. power amplllier and power supply
sections Many ordinary receivers With conSiderably higher prices require
up to a dozen complicated and potentially troublesome CII'CUII boards to
achieve the same results

FM FRONTEND WITH FET AND LINEAR VARIABLE CAPACITOR

A dual-gate low-neise MOS FET (metal oxtde semiconductor PET)
and a trequency-Iinear variable capacnor are used in the RF amplitier
stage at the FM tuner in the 661 These combined with its 3-transistor
converter stage composed of a local oscHIator and butter CirCUit,
each regulated by a separate constant- voltage power supply, provtde
excellent distortion characteristics, superior Signal-to-n0ise ratio and
very high FM sensttiwty

FM lF AMPLIFIER WITH TWO BI~FIESONATOR CERAMIC FILTERS

The 661 s IC-equippeo FM IF amplilier prowdes high station selectiVity
and reception of both local and distant FM Signals With exceptional
clarity The super-Wide selectwtty bandwmth i1 tMHz peak to peak) and
the sharp cum" ceramic Illters in its Circuns have vastly improved the
dynamic range of the FM section

NEWLYDEVELOPED |C>EOUIPPED FM MULTIPLEX DEMODULATOR
The 661 s new FM multiplex demodulator Ieatures a high-denSity IC for
improved stability. Stereo separation is better than 35dB and Total
Harmonic Distortion in stereo FM reception is less than 0 7% An FM
deemphasm swtlch msrde the chassis allows the 661 to be eaSily
convened tor ideal reception at FM Signals anywhere in the world

Sunnu'

riinu

AM TUNER SECTION

The enhanced selectiwty and senSitIVity ot the AM tuner in the 661
results train the use at newly-developed, highly selective coils and
a bi'resonator ceramic lilter in its IF amplifier stage The luners deSign
also eliminates the annoying whine and boom of AM reception

STABILIZED FM/AM TUNER POWER SUPPLY WITH RIPPLE FILTERS

Both the FM and the AM sections oI the 661 benetit trom the
elimination ol ripples and Iluctuations in power supply thanks to a new
stabilized supply technique This results in a greatly improved signal-to-
nOise ralio as well

SMOOTHVTUNE MECHANISM AND LINEAR TUNING SCALE

An attractive easy-toread black-out dial panel ol glare-tree smoked
glass is prowded on the 661 Its tuning scale is FM linear. calibrated
in equal sectlons ot 250kHz each tor easy and Iast reading. An over5izedi
brightly/lighted Signal-strength meter laCIIltates both AM and FM tuning
The smooth-tune dial mechanism in the 661 has been engineered to
incorporate an extra-large Ilywheeli speCial tensmn mechanism, and
dial string ol no-stretch/no-shrink polyester lor stability under all
temperature and humidity conditions

DIRECT COUPLED LOW-NOISE PHONO EOUALIZER

Carelullyselected low-neise silicon transistors are used in the phone
equalizer amplilier ot the 661 to provide excellent stgnal-to-norse ratio,
minimum distortion and wide dynarmc ranger IIs phono overload capacity.
an important lactor in any phone equalizer lor it determines the ability oi
the unit to respond properly to all Signals no matter how strong or weak.
is as high as 150mV RMS (420mV p-p). allowmg a Wide dynamic range
and reducmg Total Harmonic Distortion to less than 0 5%

MORE PRECISE CONTROL OF TONE

The bass and treble tone controls in the 661 are of the CR type in
a caretullyengineered destgn to minimize distortion and provtde more
preCise control of tone coloration

mimic nnxc ro-