SERVICE
MANUAL
40.22
I. GEN ERAL
The Solid State
Stereo
Amplifier,
Type T5A6, is
a
fully
traosistorized,
dual chanoel, low dis-
tortioo, hiSh fidelity
aoplifier
with a power out-
put
of
32
watts
pet
channel,
A special feature
of this
aoplifier is the speaker
overload
pro-
tection
circuit. This circuit
continually
donitors
the output curretrt.
If the
output curreot in-
creases
to a
level that may damage the ampli-
fier, the speaker
overload
proteccion circuit cuts
off
the input
to the amplifier.
The anplifier
also
contaios circuits
for treble,
bass
aod record
scratch coDpensation. These
conttols
eoable
the ouqrut to
be varied to fit
the custooers
need.
2.
CIRCUIT DESCRIPTION
For
putposes of discussion,
the audio signal
will be
traced ooly through the
right chaonel.
Refer
to
the
Scheoatic Diagrao,
Page
I
a.
Preamplifier
The preamplifier
circuit consists of
four
transistor
stages,
Q5101, Q5f02, Q5103aod
Q5104.
Transistors
Q5101
and
Q5102
are
patt
of a preanplifier with
an equalizatiod
net-
work that provides
RIAA
recold
cooPeosa-
tioo. Audio
signals from
the pickup
cattridge
are
coupled to the base of
Q5101
where they
are amplified and coupled to the base of
Q5102.
Part of
the
output of
Q5102
is
fed
back to
the eo.itter of
Q5101.
A
low frequeocy
coupliog network R5102
and
L5101
is coooected ftoo the collector of
a sioilar
circuit
in
the left chaooel.
Un-
desirable low frequency sigoals are then
coupled together
in an out of
phase
condition
effectively
caocelliog thero
out,
The
reoaining
output froo
Q5102
is capaci-
tively
coupled to the base of voltage
aopli-
SOLID
STATE STEREO
AMPLIFIER,
Type TSA5
Figure
l.
Solid
State Stereo
Aoplifier,
Type
T5A6.
t
I
i,Q
u:hi
uq
!'$
@*
."Ff,
flil0l.
ilEt:
OFfl
,,ffi,]
To Next Page
Loading...