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LABORATORY, INC.
2 CHAMBERS STREET, BINGHAMTON. N. Y,
Phone-Area Code 607-723-5491
2O-HP30-761 Printed
In
U.S.A.
BE012003
In Canada: Manufactured under license by:
McCurdy Radio
Industries, Ltd.,
22
Front
Street
West,
Toronto,
Canada
Input Selector: Selects any one eight pro-
gram sources including Tape, Tuner 1 and
Tuner 2, Auxiliary, Phono 1 and Phono 2,
Tape Head 1 and Tape Head 2. Each phono
input has two switch positions, one for
stereo the other paralles the stereo car-
trige for Monophonic records.
Mode Selector:
Reverse:
connects
left
channel
to
right
speaker,
right
channel
to
left
speaker,
corrects
for
left-right
reversal
of
program.
Stereo: (normal Stereo mode selector posi-
tion)
left
channel
to
left
speaker,
right
channel to right speaker.
Left:
left
channel
to left
speaker
no
pro-
gram to right speaker.
Right: right channel to right speaker, no
program to left speaker.
M
Left:
left
channel only
to
both
speakers.
M Right: right channel only to both speakers.
Record Compensator: Separate bass and
treble compensator switches including
"RIAA," "LP," "Tape-Head," flat position
for microphone and other positions for
monophonic records. (Turning "TREBLE"
control to "TAPE" gives flat response.
Turning "BASS" to "O" gives flat response.)
Tone Controls:
Treble: boost 13 db at 20,000 cycles atten-
uate 18 db at 20,000 cycles.
Bass: boost 16 db at 20 cycles, attenuate.
20 db at 20 cycles.
Balance Control: To balance for unequal pro-
gram source: Turning control to left re-
duces
right
channel
to No
Output
Turning
control to right reduces left channel to No
Output.
Phase
Control:
Reverses
phase
in the
left
channel to correct for speaker or program
phasing.
HF Cutoff Filter: Three positions providing
(1) no filter action for normal use, (2) 9 KC
cutoff, and (3) 6 KC cutoff to sucpress
record noise and hiss.
Loudness Control: Compensates for the Flet-
cher-Munson hearing characteristics as
program loudness is reduced.
Rumble Filter: Suppress low frequency dis-
turbences such as rumble.
Tape:
Front
panel
jacks,
push
button
switch
controlled to permit the addition of a port-
able
tape
recorder without
disrupting
the
equipment permanently installed.
Tape
Monitor:
To permit instantaneous
mon-
itoring
of
tape before
and
alter
recording.
Low Frequency Trim Controls: On the back
panel. Compensate for unequal response
at low frequencies due to position of speak-
ers or differences in speaker efficiency.
Provides 6 db boost at 50 cycles starting
from 500 cycles or 8 db cut at 20 cycles
starting from 200 cycles.
CONTROLS
Main Output: 2.5V with rated input
2 output jacks in parallel for each
channel
Tape Output: 0.25V with rated input
1 output jack for each channel
Left plus right output: 2.5 volts from source
impedance of 23.000 ohms
Voltage Amplification:
Low level inputs to Main Output:
1,000 to 1 (60db) at 1000 cycles
Low level inputs to Tape Output:
100 to 1 (40db) at 1000 cycles
High level inputs to Main Output:
10 to 1 (20db)
High level inputs to Tape Output:
1 to 1
(0db)
Tape Monitor input to Main Output:
10 to 1 (20db)
A.C. Aux. Outlets: 1 unswitched for tape
machine or turntable. colored Red; 4
switched, colored Black
Power Requirements: 117 volts 60 cycles
A.C. 35 watts
MECHANICAL SPECIFICATIONS
Size: 155/8" wide by 51/8" high. Overall
depth of chassis behind front panel is
1213/16"..
The
space
required
in
front
of
cabinet panel for the thickness of the
panel and knobs is 1¼".
Weight: Chassis only 18 pounds. In ship-
ping carton 28½ pounds.
ELECTRICAL SPECIFICATIONS
Frequency Response: ±0.5 db 20 to 20,000
cycles
Distortion: Less than 0.2% at rated output,
20 to 20,000 cycles
Hum and Noise: High level inputs: 85 db
below rated output
Low level inputs: less than 2 microvolts et
input terminals
Input Sensitivity and Input Impedance:
Auxiliary;
0,25 volts 470.000 ohms
Tape:
0.25 volts 470,000 ohms
Tuner 1:
0.25 volts 470,000 ohms
Tuner 2:
0,25 volts 470,000 ohms
Phono 1:
2 to 10 millivolts 47,000 ohms for low
output cartridge
10 to 70 millivolts 47,000 ohms for hi
output cartridge
0.1 volt 220 mmf in series with 47,000
ohms for Xtal or Ceramic
Phono 2:
Same as phono 1
Tape Head 1:
2 to 10 millivolts 47,000 ohms for low
output head
Tape Head 2;
Same as tape head 1
Tape Compare (Monitor):
0.25 volts, 115,000 ohms
