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6
methods reduces distortion in the preamp-
lifier to an extremely low value, and makes
the operation almost completely independent
of variations in transistor parameters.
THE HIGH LEVEL AMPLIFIER
The output stage, 07, is connected in the
common emitter configuration, with a ser-
ies fed output transformer, T2, in the col-
lector circuit.
Emitter resistor R29 provid-
es a large amount of degeneration, to reduce
1 PR 1
Tl
T 1 PR 1 1
N--il.1
B+(PI-4,_~
Tl OR, WH
Tl
G
large-signal distortion to a low value.
/
The low driving impedance required by
i ! .
stage of this type is obtained from the e-
mitter follower, 06. The stages are direct
coupled, with R2 5 and R26 establishing the
bias on both 06 and 07..
05 provides addi-
tional gain for the high level amplifier . .
The feedback network,
R2 8 and C 16,
is
used primarily for low frequency response
compensation.
CONTROL
P 1-1
AMP IN
CONTROL ARM
PI-2
CONTROL COM
PI-3
B+(PI-4)
B-(Pl-12)
T2 PR[ RED
T2 PRI BLUE
Fig. 6 - Printed Board Component Location, Viewed from Wiring Side.
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