The Model supplies 250 watts (rms continuous output) at less than 0.5% total harmonic distortion from 20 to 20,000Hz. An input signal of only 500mV is required for full rated output.
The input impedances are: high-impedance (50,000 ohms) unbalanced; low impedance (500/600 ohms, balanced or unbalanced) with optional accessory transformer Model TL-600. Line bridging can be achieved with optional transformer Model TL-100. Residual hum and noise is at least 90dB below rated output and the output regulation is better than 2dB from no load to full load.
The model can drive a variety of load impedances. Outputs include 4 ohms, 8 ohms, 25VCT and 70.7 volts. The amplifier is capable of safely driving any recommended load continuously. The HTA-250A is thermally protected to prevent damage due to excessively high temperatures; however, the amplifier will deliver the full rated output continuously, even at +49°C (+120°F). Additional failure-preventive devices include overload limiting, short circuit protection, and a Slo-Blo fuse.
Electronic shutdown circuitry is automatically activated if an overload or short occurs and a front panel overload shutdown LED illuminates. Once the cause has been rectified, the unit automatically resets.The power on/off switch, located on the front panel, illuminates when power is on. The rear panel contains an input level control, input and output connections, the ac line fuse, and an auxiliary receptacle. A low-cut filter switch is located internally.
Capable of continuous operation at rated output power
Frequency response ±1dB, 20 - 20,000Hz at full rated output
Distortion less than 0.5% THD, 20 - 20,000Hz
Multiple output voltages/impedances available
Automatic overload protection