Altec 9444a service manual

Page 1

ALTC

9444A
POWER AMPLlFlER

ALTEC LANSIN

FCtNEfi AMPLIFIER

MODEL 9444A

DESCRIPTION

As the level of sophistication in power amplifier
designs increases, two things typically result;
increased cost and reduced reliability. The ALTEC
LANSING Model 9444A Anniversary Series
Power Amplifier utilizes the best proven concepts
derived from our 50 year history to provide an
ultra reliable amplifier with virtually unmatched
performance characteristics. It achieves this suc-
cess without increased complexity or cost making
it a real value.

Each channel delivers 200 watts of continuous
average power into 8 ohms or 300 watts into 4
ohms over the full audio frequency range. In the
bridge mode, the amplifier can deliver more than
600 watts at less than 0.10% THD.

Sixteen metal output transistors are utilized for a
total device power dissipation of 4,000 watts. A
dual speed fan is incorporated as an added relia-
bility measure for the most thermally stressing sit-
uations. The massive ll!» inch heatsink is
specially engineered to minimize thermal gradi-
ents meaning that all of the transistors now oper-
ate at approximately the same temperature. As a
result, the amplifier runs cooler than most
enabling it to operate under more adverse envi-
ronmental conditions without failure. in a typical
fixed installation, this means that the long term
reliability is substantially increased.

The 2.2 KVA equivalent universal power transv

former and the 22,000 microfarads of total mi
itance combine to provide the reserve powoi n
essary in todays installations anywhere i:
world.

Each channel is independently prott'.

against...

- Over temperature - Radio frequency

0 Excessive output interference
voltage - Shorted loads

- Excessive phase shift

The load is protected from startup/shutdowr;
sients, subsonic signals, low AC line voltagt
DC. When a problem is detected, an output
automatically disconnects the load from the » .
nel and illuminates the Protect LED locttli
the front panel.

The 9444A has electronically balanced inpti;
powered accessory sockets for plug-in
formers and electronic modules. The leViz
trols are rear mounted to avoid accitlt w
changes. True output balancing transit,
(models 15524A and 15525A) and an autui
(model 15567A) are also available.

The ALTEC LANSING Model 9444A Annn
Series Power Amplifier is the choice for «
professional installations which demaiu
highest quality at high power levels for cw
periods of time.

..i

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