Yamaha M-4 - FEATURES; Voltage Amplifying Stage Design; Driver and Power Amplifier Circuitry; Power Supply and Stability Features

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Thank you very much for purchasing the YAMAHA Stereo Power Amplifier M-4. CONTENTS
Developed by applying the best of YAMAHA’s superior electronic technology, the FEATURES 5
M-4 is a DC stereo power amplifier that achieves an extremely high level of perform- CAUTION: READ THIS BEFORE сања
ance.
OPERATING
YOUR
M-4
..............
3
The output stage, which uses pure ioniplementam OCL and parallel push-pull circuitry, CONNECTION DIAGRAM |............. 4
produces the rated output of 120W + 120W (General and European model) without any . .: | [CONNECTION AND OPERATION |........ 6
strain on the large-capacity power supply section. = | | | | | [FRONT PANEL AND CONTROLS J........ 7
Before first operating your M-4, please read this Owner's Manual carefully, in order SPECLEICATIONS ЕРЕ ee 8
to
fully
realize
the
potential
of
the
unit
and
to
keep
it
in
best
"ከ
ከ
ከክ
for
many
|
|
|
[BLOCK
DIAGRAM
)..................
9
years of trouble-free use... sss [CHARACTERISTICS DIAGRAM | ......... 9
0 |ЗСНЕМАТІСОІАСВАМ .|............... 10
но И 11
FEATURES
9 The voltage amplifying stage employs а cas © Two extremely large 15,000 uF capacitors,
cade-connected differential two-stage circuit
throughout.
The use of a Dual FET input and a new cas-
cade bootstrap circuit in the first stage and
a cascade-connection, current mirror and push-
pull output in the pre-drive stage ensures a
high degree of stability, low distortion and
improved high-frequency characteristics.
In the driver and the power amplifier a three-
stage emitter follower is paralleled with: pure
complementary OCL SEPP circuitry using
high-fT transistors. This accounts for wide
bandwidth, high output and low distortion.
two separate constant-voltage power supplies
for the voltage amplifying stage, and the use
of a pure copper plate earth line for ultra-
low impedance guarantee greatly reduced inter-
modulation distortion, improved separation
and absolutely stable operation.
Other Features
Except for the chemical capacitors in the
power supply section, mylar and styrol capac-
itors are employed throughout.
Layout of parts, wiring, earth line as well as
many other aspects have been given due con-
sideration.
The basic design ensures high reliability, while
the ultimate aim has been the improvement
of the overall audio characteristics,
Special Instructions for British-Standard Model
IMPORTANT |
THE WIRES IN THE MAINS LEAD ARE COLOUR-
ED IN ACCORDANCE WITH THE FOLLOWING
CODE:
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured mark-
ings identifying the terminals in your plug, proceed as
follows. The wire which is coloured BLUE must be
connected to the terminal which is marked with the
letter N or coloured BLACK. The wire which is colour-
ed BROWN must be connected to the terminal which
is marked with the letter L or coloured RED.