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Following the AM I F amplifier, the AM detector
recovers the audio modulation and provides this
signal to the SELECTOR Switch.
The AM tuner and I F amplifier incorporates an
automatic gain control circuit which maintains
a constant level of all stations in the AM band.
An advanced AM tuner integrated circuit has
been utilized for the AM tuner portion of the
Model 4300.
PHONO AMPLIFIERS
These amplifiers permit phono signals of up to
100 millivolts to be handled without overloading.
The RIAA equalization network provides precise
equalization and sets the phono preamplifier
voltage gain to 40 dB (at 1,oooHz).
SELECTOR SWITCH
The SELECTOR Switch selects the program
source for listening or recording. The Model
4300 has four sets on input jacks: PHONO, CD·
4/AUX, TAPE MONITOR 1 and TAPE MONI-
TOR 2. Any discrete 4-channel program source
can be connected to the CD-4/AUX jacks. The
input sensitivity for each set of input jacks is 1.8
millivolts at PHONO, and 180 millivolts at CD-
4/AUX, TAPE MONITOR 1 and TAPE MONI-
TOR 2. The SELECTOR Switch outputs are
fed through the DOLBY Switch and TAPE
MONITOR OUT jacks to the MODE Switch.
MONITOR SWITCH
When the MONITOR Switch is in the SOURCE
position, the SELECTOR Switch outputs are fed
through
~~e
DOLBY Switch to the MODE Switch.
When the MONITOR Switch is in TAPE 1 or
TAPE 2 positions, the input signals from the
TAPE MONITOR (1 or 2) jacks are fed to the
DOLBY Switch.
TONE CONTROL
After volume level control, each channel program
source is fed into the tone control network. The
network uses two-stage, direct-coupled NPN and
PNP configuration at the input stage for the high-
impedance termination of the volume control
output, and low driving impedance to the R-C
feed back type tone control network. In the
tone control network, each signal adjusted for
bass and treble is amplified in two-stage, direct-
coupled NPN and PNP configuration and is
delivered through a HIGH FILTER Switch to the
main amplifier section. The driving impedance
to the balance high filter section is satisfactorily
reduced by NFB.
POWER AMPLIFIER
Your power amplifiers are incorporated for driv-
ing left-front, left-rear, right-front and right-rear
speakers. Each of these amplifiers includes pre-
amplifier, driver, electronic protective and output
circuits. These amplifiers consists of four totally
direct-coupled and differential amplifiers to pro-
vide superior dynamic characteristics, frequency
response and satisfactory D.C. stability. The
output stages employ eight high current, high
voltage, silicon output transistors, having superior
linearity
and
sufficient collector dissipation
margin,
arranged
in a quasi-complimentary
Darlington format.
DRIVER STAGE
This stage incorporates a pair of push-pull,
complimentary-symmetry transistors (PI\lP, NPN).
The electronic protective circuit comprised of
three transistors and four diodes for each channel,
senses the peak output current and limits the
current to the driver transistors at a safe, pre-
determined value. This limiting current protects
the driver and output transistors under over-drive
and short circuit conditions and effectively pre-
vents the driver and output transistors from
exceeding safe operating conditions.
GENERAL
REQUIREMENTS
Power Requirements ..... 120V AC 50 to 60Hz
Power Consumption
- at rated power output, all channels·
650W
- idling (no signal)
"
60W
Dimensions - Panel Width·· .. ·19·19/64 inches
- Panel Height . . . .
5-3/4 inches
- Depth
15-3/16 inches
Weight - Unit alone·
51.6 Ibs
- Packed for shipment
62.7 Ibs
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