Altec 1407a 1415a service manual

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HIGH QUALITY, LOW COST

GENERAL PURPOSE MONAURAL POWER AMPLIFIERS

1407A and 141 5A Power Amplifiers

,. - MASTER LEVEL CONTROL AND CONFIGURATION SWITCHES ARE REAR MOUNTED
° TWO AUXILIARY UNBALANCED OUTPUTS ARE PROVIDED
' FULLY PROTECTED FROM SHORT CIRCUITED LOADS

CIUbS The Altec Lansing 1407A and 1415A power amplifiers are high quality low cost monaural power
0 Convention Centers amplifiers for general purpose applications and those involving the use of ALTEC LANSINCS 1700

. Hotel Paging Systems series mixer products.

' .
HOUSES Of Worship Both amplifier models are identical in size and features and differ only in their output power ratings.

. Meetlng'HaIls The "WA is a 75 watt amplifier while the 1415A produces 150 watts of continuous average output
' Monltonng power. Included are many built-in features that far exceed what is normally found in amplifiers
Installations of this type. This fact undeniably eases any design chore. For example, the amplifiers include a

I
l APPLICATIONS DESCRIPTION

15 k0 input bridging transformer, a 300 Hz high pass filter (switchable), a 15 dB input pad (switchable),
and a choice of four input connector types; a 5-lug screw terminal, female XLR, male XLR, and a
, phono connector. The male XLR is also usable as a convenient patch output point for routing the
I input signal to another amplifier.

- Touring Sound

Two auxiliary unbalanced outputs are also provided. One is before (prefader), and the other after
(post-fader), the MASTER output level control. These outputs greatly simplify many complex system
designs. In addition to a 40 direct output (80 in 1407A), a built-in output transformer provides
a plurality of true balanced outputs including 89 (49 in 1407A), 25 volts, and 70.7 volts.

The amplifiers are fully protected from short circuited loads, over temperature, and excessive load
reactance, and the loads from turn-on/turn-off transients, subsonic signals, and DC. When a problem
is detected the output relay automatically disconnects the load and illuminates the front panel
PROTECT indicator. In addition, a from panel clipping indicator warns of excessive output levels,
The MASTER level control and configuration switches are rear mounted for extra protection against
accidental" changes made by non-qualified personnel.

The Altec Lansing 1407A and 1415A power amplifiers are the choice in professional designs where
quality, reliability, flexibility, and cost are of prime concern.