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FEATURES

Power Amplifier for a Continuous Power Output

of 80

Watts

Per Channel

and

for Ultra-Stable

Sound Reproduction

@ The adoption of a single-stage differential amplifier with

low-noise

dua!

transistors,

pre-driver stage a current

mirror

load

and

SEPP

circuit provides a bumper

power output of 80 watts + 80 watts( continuous

power

output of 80 watts"

per channel,

min., at 8 ohms from 20 Hertz to 20,000

Hertz with no more than 0.05% total har-

monic

distortion)

which is extremely stable. These

features also guarantee

a stable operation at all times

from low outputs to high outputs.

@ The power amplifier is configured as a DC power ampli-

fier with the capacitors removed from the NFB circuit

for a flat gain response all the way from the lowest of

the low frequencies up to the audio frequencies. At the

same

time, the design is engineered for low distortion

with

the

incorporation

newly

developed

power

transistors.

@ The large-sized transformer

with

its superb regulation

employ two 18,000uF large-capacity electrolytic capaci-

tors in the power supply and permit high sound quality

even at lowest frequencies.

IC-Based FM Tuner with High Selectivity, High S/N

and Low Distortion

The FM front end incorporates a 1-stage RF circuit that

employs

a 4-gang

tuning

capacitor

and

a dual-gate

MOS

FET

for high gain and

low noise. This config-

uration

excels

in ridding

the

sound

of undesirable

interference

for

impressive

statistics:

1.7uV

(IHF)

sensitivity,

than

100dB

spurious response

ratio

and more than 90dB image response ratio.

The FM IF amplifier combines three dual-element phase-

linear

ceramic

filters

with

two

IC's

which

contain

quadrature detectors for a high selectivity (80dB) and a

low distortion (MONO:

0.1% at 1kHz).

The stereo demodulator employs an NFB-type PLL MPX

IC with a automatic pilot canceller which automatically

cancels

out

the

pilot signals

without

reducing

the

high-end

frequency.

This means

that the leak carrier

level is amply suppressed for a tip-top separation and flat

frequency response in the reproduction frequency band.

AM Tuner Includes Newly Developed !C

The

tuned

amplifier

circuit

incorporates

newly

developed

high-sensitivity,

low-distortion

IC and

2-gang variable

capacitor. These contribute to enhanced

imaging and

RF interference

rejection capabilities. Since

the

optimum

AGC

voltage

is supplied to each section,

stable reception can be obtained with low spurious inter-

ference and distortion even in high field strength areas.

Precise Record Equalization

e@ A balanced power supply is used in the equalizer ampli-

fier to obtain a maximum allowable input of 200mVrms

(1kHz).

Low

distortion

record

playback

can thus be

enjoyed

even

with high output phono

cartridges and

music sources containing large peak signals.

@ The equalizer elements which are designed to produce

the RIAA characteristics use high-precision parts to keep

the equalizer deviation between 20Hz — 20kHz down to

+0.2dB

for faithful sound

reproduction from records.

Other Features

TURNOVER

switches:

These switches yield variations in

the curves of the tone controls when they are operated in

conjunction with the other bass and treble tone controls.

One

is used

for the bass and the other for the treble,

thereby allowing plenty of variation in tone control adjust-

ment.

Highly

reliable protection

circuitry:

In order to protect

the speakers and the power transistors, this receiver features

a newly developed protection IC as well as a special muting

circuit that cuts out the noise produced

by the on/off

operation of the power switch. Needless to say, these are

very dependable and stable protection circuits. In addition,

there

is an inrush current suppressor circuit which

sup-

presses surges of current when the power is switched on.

FM 25us switch: The receiver's front panel is equipped

with a de-emphasis selector switch which is useful when the

receiver is tuned into an FM Dolby

station. This facilitates

operation when the receiver is set up for the reception of

an FM Dolby broadcast.

TAPE

DUPLICATE

switch: This switch allows you to use

two tape decks to edit or duplicate material recorded on

one tape to another. Duplication from an open-reel deck to

a cassette

deck,

for

example,

can

be performed

in a

one-touch operation.

Power

meters: Each

channel

has its own

power

meter

(0.01W — 160W display range) with a logarithmic com-

pression scale. These meters feature a fast response speed,

and they enable you to read out the power

values at an

8-ohm

impedance

across

a power

band

stretching from

0.01W up to the maximum output of the receiver.

6kHz (high) and 15Hz (low) filter switches: Featured are

a filter for GdB/octave

attenuation

at frequencies below

15Hz in order to eliminate ultra-low-range noise generated

by warps in the records, and also a 6kHz (6dB/oct attenu-

ation) filter that eliminates high-range noise such as that

produced by scratches on the records and hiss.

*Measured

pursuant to Federal Trade Commission's Trade

Regulation

rule on Power

Output Claims for Amplifiers.