Altec Lansing 9444-A (ca. 1980s)
Documentation on the Altec Lansing 9444A is thin, but a surviving copy of the operating and service manual covers the essentials. It was a rackmount dual-channel power amplifier from Altec's "Anniversary Series" - a line that also included the later 9444B. The manual describes it as the product of "the best proven concepts derived from our 50 year history," an ultra-reliable design that traded complexity for longevity.
Each channel delivers 200 watts continuous average into 8 ohms, or 300 watts into 4 ohms, across the full audio range. Bridged, the amp is rated for more than 600 watts at under 0.10% THD. Sixteen metal output transistors handle a total device dissipation of 4,000 watts. A dual-speed fan cools them, and a 3/16-inch heatsink is engineered to keep all the transistors at roughly the same temperature. Altec's reasoning was that the amp runs cooler and so survives adverse environments longer. A 2.2 KVA-equivalent universal power transformer and 22,000 µF of total capacitance provide the reserve for worldwide installations.
Protection is extensive. Each channel independently guards against over-temperature, excessive output voltage, RF interference, shorted loads, and excessive phase shift. The load is protected from startup/shutdown transients, subsonic signals, low AC line voltage, and DC. When a fault is detected, an output relay disconnects the load and lights a front-panel "Protect" LED. Inputs are electronically balanced, via barrier strip or XLR, and the amp has powered accessory sockets for plug-in transformers and electronic modules. Level controls are rear-mounted so nobody bumps them by accident. Optional true output balancing transformers (models 15524A and 15525A) and an autoformer (15567A) were offered for long cable runs and 70.7V distribution.
The manual is thorough on installation. It specifies 5½ inches of vertical rack space, warns against ambient temperatures above 60°C, and gives full guidance on speaker cable gauge, damping factor, and inline fuse selection. A schematic is included, along with DC offset and bias adjustment procedures that need only a millivolt-range DC voltmeter.
Beyond the manual, the record is sparse. No production years or original price have surfaced. A 2026 eBay asking price of $299 is the only market figure found. A diyAudio thread titled "Altec Lansing 9444A amp clipping problems" indicates at least one owner ran into clipping issues, though no further detail is recorded. One collector note claims the 9444A has larger capacitors than the 9444B, making it the better choice for low-frequency speakers. That is unverified. The same source rated it highly for passive studio monitors like NS-10s and home hi-fi use.
Known specifications, from the manual:
- Type: Dual-channel rackmount power amplifier, Anniversary Series
- Power: 200 W/ch into 8Ω; 300 W/ch into 4Ω; 600 W+ bridged at <0.10% THD
- Output devices: 16 metal transistors, 4,000 W total dissipation
- Cooling: dual-speed fan, 3/16" heatsink
- Power supply: 2.2 KVA-equivalent transformer, 22,000 µF total capacitance
- Inputs: electronically balanced, XLR and barrier strip
- Protection: over-temp, over-voltage, RFI, shorted load, phase shift, DC, subsonic, low AC; relay disconnect with front-panel LED
- Rack space: 5½ inches vertical (3 RU)
- Optional: 15524A / 15525A output transformers, 15567A autoformer
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