Yamaha M-2 - Page 2

Thank you very much for purchasing the YAMAHA Stereo Power Amplifier M-2 Developed CONTENTS
by applying the best of YAMAHA’s superior electronic technology, the M-2 is a DC stereo
power
amplifier
that
achieves
an
extremely
high
level
of
performance.
OR
>
The output stage, which uses pure complementary OCL and triple push-pull circuitry, Caution: Read. This Before Operating
produces
the
rated
output
of
240W
+
240W
without
any
strain
on
the
large-capacity
power
Your
M2...
RE
3
supply
section,
ee
ÍConnection
Diagram.
EO
4
Before
first
operating
your
M-2,
please
read
this
Owner's
Manual
carefully,
in
order
to
0011...
[Front
Panel
and
GT
`
6
realize
the
potential
of
the
unit
and
to
keep
it
in
best
condition
for
many
years
of
trouble-
^ ^
[Connection
and
Operation
.|...........
7
free
use.
Specifications
|...
.................
8
Block Diagram
s
er
rU
Or
Ci
EC EO
Eg
9
Schematic Diagram | ................. 10
Troubleshooting |.......... eren 11
€
The
voltage
amplifying
stage
employs
a
cascade-
€
Two
extremely
large
22,000
uF
capacitors,
two
connected
differential
two-stage
circuit
separate
constant-voltage
power
supplies
for
the
throughout.
The use of a Dual FET input and a cascode
bootstrap circuit in the first stage and a cas-
cade-connection, current mirror and push-pull
output in the pre-drive stage ensures a high
degree of stability, low distortion and im-
proved high-frequency characteristics.
In the driver and the power amplifier a three-
stage emitter follower is pure complementary
OCL SEPP circuitry using high-ft transistors.
This accounts for wide bandwidth, high output
and low distortion.
voltage amplifying stage, and the use of a pure
copper plate earth line for ultra-low impedance
guarantee greatly reduced intermodulation dis-
tortion, improved separation and absolutely
stable operation.
Other Features
Except for the chemical capacitors in the power
supply section, mylar and styrol capacitors 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.
IMPORTANT!
Please record the serial number of your
unit in the space below
Model Name M-2
Serial No.
The serial number is located on the rear
of the chassis.
Retain this Owner's Manual in a safe place
for future reference.