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selectively to the desired source.
TAPE SIGNALS
With the exception of tape input, all high-level
inputs are fed directly to the selector switch. Tape
input is routed through the front panel dubbing IN
jack to a section of the TAPE MONITOR switch.
The dubbing IN jack is a three-conductor stereo
jack which has two built-in switches, one for each
channel. Normally, these switches are closed,
allowing the tape input signals from the TAPE IN
jack on the rear panel to be fed to the TAPE
MONITOR switch. When a plug is inserted in the
dubbing IN jack, the switches are opened,
disconnecting the TAPE IN jacks and allowing the
signal from the dubbing IN jack to reach the TAPE
MONITOR switch. Thus only one tape recorder at
a time can feed playback signals into the Model
2230.
TAPE MONITOR SWITCH
When the TAPE MONITOR pushswitch is in the
"out" position tape input signals from the TAPE
IN jacks on the rear panel or dubbing IN jack on
the front panel are fed to the selector switch. When
the TAPE MONITOR is depressed, the output of
the selector switch is disconnected from the
balance control and the tape input signals from the
TAPE IN or dubbing IN jacks feed the balance
control directly.
PHONO SIGNALS
Phono siqnals of up to 100 millivolts can be
handled without overloading. The RIAA equal-
ization network provides precise equalization and
sets the voltage gain of the phono preamplifier to
40dB (at 1,000Hzl.
MONO FUNCTIONS
When the MONO pushswitch is in the "in"
position, the two channels are connected together
through mixing resistors. In addition, the left and
right channel tape input signals are connected to-
gether through a similar resistor network. This
facility allows all inputs to be converted to the
monophonic mode.
CONTROL CI RCUITS
The control circuits portion of the Model 2230
consists of the balance, volume, bass, mid, treble,
Hi FIL TER;and LOW FILTER controls. All
controls affect the left and right channels
simultaneously.
With the controls set for flat response and volume
control at maximum, the over-all voltage gain from
any high-level input to the loudspeaker terminals is
approximately 38dB.
BALANCE CONTROL
The balance control is a wide-range control which
permits attenuation of each channel to cutoff. The
change of attenuation in each channel as the
control is turned away from center has been
designed to maintain total apparent loudness from
both channels. This feature makes it a true stereo
balance control.
VOLUME CONTROL
The volume control attenuates both channels
simultaneously Clnd maintains tracking to within
3dB at any point of attenuation to -SOdB from
maximum. Since the control is situated at the
input of the tone amplifier, there is no possibil ity
of overloading the amplifier stages under maximum
rated output conditions. Thus, distortion is kept to
a minimum. After attenuation by the balance and
volume ·controls, the signal is applied to the tone
amplifier.
TONE AMPLIFIER
The TONE AMPLIFIER's circuitry uses a con-
tinuously variable R-C feedback-type configura-
tion.
The signal from the TONE AMPLIFIER feeds the
hi/low filter circuit when the Hi FILTER or the
LOW FI LTER pushswitch is depressed.
Hi·LOW FILTERS
The Hi-Low filters provide 6 dB or fall off per oc-
tave.
GENERAL
I
Power Requirements '" 120 V AC 50 to 60 Hz
At rated output,
both channels operating 220 Watts
Idling Power (Volume Control at zero) 48 Watts
Dimensions
Panel Width 17
21164 Inches
Panel Height 5 25/64 Inches
Depth 14 Inches
Weight
Unit alone 28.6Ibs
Packed for shipment 38.6Ibs
13
16


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