Altec 783 pre amplifier

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ALTEC ®

1783 LINE OUTPUT
MODULE

DESCRIPTION

Output Module. The ALTEC LANSING 1783 line output
module provides the drive capability necessary to inter-
face with other professional equipment. The electron»
ically balanced output stage provides a low source
impedance to drive subsequent stages. If transformer

SPECIFICATIONS

1783 LINE OUTPUT MODULE

Output Type: Electronically balanced
Output Source

Impedance: <50!)

Nominal Output

level/load

Impedance: + 8 dBm/6000

(Ref.1 kHz, 0 dBm = 0.775 Vrms across 600 0 load,

output level control at maximum, 100 mVrms input)

Maximum Output

Level: +24 dBm

Frequency Response (Ref. 1 kHz, +8 dBm output)
Without 1786

"-1 dB 20 H2725 kHz

1'3 dB 10 HZSO kHZ
Without 1786

$1 dB 30 HZ - 20 kHz

:3 dB 15 H2740 kHZ

Total Harmonic Distortion (Tl-ID): (Ref. 1 kHz, +8
dBm output, output level control at maximum, 30 kHz
low pass filter)

Without 1786

20 Hz - 20 kHz <0.05%
Without 1786

20 HZ » 20 kHz <0.l%

Signal-to-Noise Ratio: >88 dBm
(Below +8 dBm output, output level control at
maximum, A-weighted)

isolation is necessary, the modules circuit board
accommodates the optional Pcimount 1786 output
isolation transformer. The continuously variable out,
put level control is local to the module permitting
independent adjustment of each line output.

1 - Output level control
Weight (Net): 2.2 oz (63 gr)
Power Requirements: :18 VDC at 20 MA.
(Supplied by mainframe)
Included Accessories: 2 - mounting screws

(for protentiometer bracket)
Optional Accessories: 1786 Output Isolation
Transformer

1786 OUTPUT ISOLATION TRANSFORMER

Impedance Ratio: 6000:6000
(Primary: Secondary)
Frequency Response: (Ref, 1 kHz, +18 dBm output)

Control:

i1 dB 20 HZ-ZO Hz

13 dB 10HZ-40 HZ
Total Harmonic Distortion (THD): (Ref. 1 kHz, +18
dBm output)

20 HZ - 20 HZ <0.5%

50 H2720 HZ (0.1%
Insertion Loss: <1 dB

(Ref. 1 kHz, +18 dBm output)

ALTEC LANSING continually strives to improve their
products and performance. Therefore specifications
are subject to change without notice.

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CONNECTORS FOR USE WITH 1783

4E

40

ARCHITECT'S AND ENGINEERS SPECIFICATIONS

The line output module shall have a low source im»
pedence, continuous variable gain, and the capability
for adding a 1786 output isolation transformer. In
addition, the module shall be fully compatible with
the 1700-series mixer/preamplifier and mixer/power
amplifier mainframes, and accept any one of the 1790-
series input connectors.

The line output module shall meet the following per,

4F

4H

formance criteria. Gain: 26 dB, continuously variable.
Frequency response: 50 Hz to 20 kHz, :1 dB. Output
source impedance: Total Harmonic Disrtortion (THD): <.DS%, (<1% with
1786], Ref. 1 kHz, +8 dBm output, 30 kHz low pass
filter.

The line output module shall be the ALTEC LANSING
Model 1783.

©1939 ALTEC LASING CORPORATION

P.0. BOX 26105, OKLAHOMA CITY, OK 73126-0105, U.S.A. j

PRINTED IN USA. 1189-3.5M

A L-2567
42-07-027704