Harman Kardon TA12 Owners Manual - Page 8

characteristics

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EZ81 (V1) B+ 330V RECTIFIER 3 8 100 mfd 40 mfd 20 mfd EL84 (V5) OUTPUT PRIMARYOUTPUT TRANSFORMER EL84 (V6) OUTPUT a + 310V ECC-83 (V2) PREAMPLIFIER B + 250V h. • 0 04 14 4.• VOLUME CONTROL 10 mfd B +250V TR BLE CONTROL 6AU6 (V3) VOLTAGE AMPLIFIER BASS CONTROL 6C4 (V4) PHASE INVERTER V6 ECC85 V1 ECCB5 T2 V2 6BA6 T3 OSC INJECTION TEST POINT FEEDBACK V3 6AU6 These photographs show the printed circuit boards used in the Harman-Kardon Solo II and indicate to some degree the corn-, plexity of design and painstak-' ing care required in the plan- ning of such a unit. FM frequencies, by their very nature, require careful placement of parts and leads. In conventional point to point wir- ing, misplacement of a wire, even a slight amount from its correct position will adversely affect operation. The amplifier has been de- signed to use printed circuits in those areas where each component and each connecting lead must be carefully positioned in order to afford best possible operation. This design form results, we feel, in providing the best possible characteristics and reflects the highest state of the art in the construction of fine high fidelity equipment. T4 V4 6AU6 LIMITER TEST POINT • fi () ) '0 11.4A4 0 x'71 4 :• • O- 77%4.' ..:•-• + TEST POINT T7 V7 6BE6 ELECTROLYTIC CAPACITOR T6 AM OUTPUT T5 V5 6AL5 DISCR. TEST POINT

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100
mfd
40
mfd
20
mfd
EZ81
(V1)
B+
330V
RECTIFIER
3
8
VOLUME
CONTROL
10
mfd
B
+250V
EL84
(V5)
OUTPUT
04
TR
BLE
CONTROL
PRIMARY
-
OUTPUT
TRANSFORMER
EL84
(V6)
OUTPUT
h
.
•
14
0
a
+
310V
B
+
250V
4.•
ECC-83
(V2)
PREAMPLIFIER
6AU6
(V3)
6C4
(V4)
VOLTAGE
BASS
PHASE
AMPLIFIER
CONTROL
INVERTER
V6
V1
ECC85
ECCB5
OSC
INJECTION
TEST
POINT
T7
4
:•
•
T2
V2
6BA6
'0
1
1.
4
A4
•
fi
()
)
0
+
TEST
POINT
V7
ELECTROLYTIC
6BE6
CAPACITOR
T6
T3
O
-
FEEDBACK
V3
6AU6
x'7
1
77%4'
.
..:•-•
AM
OUTPUT
T5
These
photographs
show
the
printed
circuit
boards
used
in
the
Harman-Kardon
Solo
II
and
indicate
to
some
degree
the
corn-,
plexity
of
design
and
painstak-'
ing
care
required
in
the
plan-
ning
of
such
a
unit.
FM
frequencies,
by
their
very
nature,
require
careful
place-
ment
of
parts
and
leads.
In
conventional
point
to
point
wir-
ing,
misplacement
of
a
wire,
even
a
slight
amount
from
its
correct
position
will
adversely
affect
operation.
The
amplifier
has
been
de-
signed
to
use
printed
circuits
in
those
areas
where
each
com-
ponent
and
each
connecting
lead
must
be
carefully
positioned
in
order
to
afford
best
possible
op-
eration.
This
design
form
results,
we
feel,
in
providing
the
best
pos-
sible
characteristics
and
reflects
the
highest
state
of
the
art
in
the
construction
of
fi
ne
high
fi
delity
equipment.
T4
V4
6AU6
V5
6AL5
LIMITER
TEST
POINT
DISCR.
TEST
POINT