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Altec 9444B & 9444B/SA Anniversary Series Power Amplifier

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Altec 9444B Amp page 3

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Output Topology: True complementary symmetry with grounded collectors. (Better heat transfer because no mica insulators are used.

Output Type:
Dual mode: Each channel unbalanced.
Bridge mode: Balanced.

Output Devices:
Total number: 16 devices.
Pdmax rating: 250 watts.
Vceo: 250 volts DC.
Ic: 16 amps DC.
Tjmax: 200°C.

Controls and Switches:
Front Panel: Power switch.
Rear Panel: Two input level controls (9444B) or two precision stepped attenuators (9444B/SA), Mode switch.

Stepped Attenuator Step Sizes: (9444B/SA ONLY) Maximum counter-clockwise position: OFF Maximum clockwise position: 0 dB attenuation. Attenuation per step from max. CW position:
Step No. Attenuation.
1-20: 1 dB (20 dB attenuation at step 20)
21-25: 2 dB (30 dB attenuation at step 25)
26: 3 dB (33 dB attenuation at step 26)
27-29: 4 dB (45 dB attenuation at step 29)
30: 5 dB (50 dB attenuation at step 30)

Front Panel Indicators: Power LED, Clip LED (x2), Protect LED (x2). Connections:
Input: 6 terminal barrier strip.
Female XLR (x2).
Octal accessory socket (x2), powered
with +/-15 volts DC at 25 ma.
Output: 4 terminal barrier strip
Power: 8 ft, 3-wire, 16 GA power cord with
NEMA 5-15 plug.

Fuse Type: LittelfuseType 3AB 10A/250V Slo-Blo 326-series ceramic cartridge body, or equivalent (for 120 Vac use).

Power Requirements: 120 Vac, 50/60 Hz, 1000 watts. (Configurable to 220/240 Vac). 100 Vac, 50/60 Hz model available.

Operating ac Voltage
Range: Nominal 120 Vac for full power output. Will operate from line voltages as low as 90 Vac with reduced power output.

Operating Temperature
Range: Up to 60°C (140°F) ambient.

Power Consumption/Heat Produced:
(Both channels operating in dual mode with 1 kHz sinewave
input signal at stated output power into 4Q loads)
Idle: 72 watts/0.245 kBTU/hour. 1/8th max midband power: 720 watts/2.100 kBTU/hour. 1/3rd max midband power: 1,068 watts/2.702 kBTU/hour.
Rated output power: 1,464 watts/2.938 kBTU/hour.
Max midband power: 1,680 watts/2.873 kBTU/hour.

Dimensions (Rear of rack ears to max depth): Height: 5.25 inches (13.3 cm).
Width: 19 inches (48.3 cm).
Depth: (Behind 13 inches (33 cm). mounting surface.)

Net Weight: 34 Ibs.(15.5 kg). Shipping Weight: 42 Ibs.(19.1 kg). Color: Black.

Enclosure: Rack mount chassis, 16 GA steel, 3/16 inch 5052 aluminum alloy front panel.

Standard Accessories: 4-"U" jumper plugs for octal sockets. (2 per socket, installed) 1 - Operating Instructions and Service Manual. 1 - 5 A/250 V fuse. (For 220/240 Vac use.)

Optional Plug-in 15581A 24 dB/octave
Input Accessories: Linkwitz-Riley Crossover. 15594A-xxx 18 dB/octave Low- Pass Filters. 15595A-xxx 18 d B/octave High- Pass Filters. 14712A Power Limiter. 15599A Bass Boost Module. 15015A Input Bridging Trans(orrner. 15515A Input Bridging Transformer with Pad.

Optional Output 15524A 300 watt 70 volt
Accessories: Output Transformer.
15525A 600 watt 70 volt Output Transformer.
15567A 300 watt Autoformer.

Design and
Performance Approvals: Meets the requirements, of UL Standard 813 and CSA C22.2 Standard #1.


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