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9446A Anniversary Series Power Amplifier

• THERMALLY-EQUALIZED DESIGN MINIMIZES THERMAL GRADIENTS ACROSS HEATSINK
• IMMUNE TO THE EFFECTS OF REACTIVE OVERLOADING
• NO "SOFT KNEE" DISTORTION PROBLEMS

DESCRIPTION

The 9446A Anniversary Series power amplifier. Each channel delivers 400 watts of continuous average power into 80 or 600 watts into 40 over the full audio frequency range. In the bridge mode, the amplifier can deliver more than 1200 watts at typically less than 0.01% DID.

Thirty-two metal output transistors are utilized for a total device power dissipation of 8,000 watts. A dual speed fan is incorporated as an added reliability measure for the most thermally stressing situations. The massive heatsink assembly was specially engineered to minimize thermal gradients. As a result, the amplifier runs cooler enabling it to operate under more adverse environmental conditions without failure.

Each channel is independently protected against:
• Over-temperature • Radio frequency interference
• Shorted output terminals

The load is protected from
• Startup/shutdown transients • Subsonic signals
• DC faults

The 9446A has electronically balanced inputs and powered octal accessory sockets for plug-in transformers and electronic modules. The level controls are mounted on the rear panel to reduce the risk of "accidental" changes as well as the bridge switch. Two 70 volt output balancing transformers, models 15524A (300 watt) and 15525A (600 watt), and a 300 watt autoformer, model 15567A, are also available_