Model 400 Series 2 power amplifier

A classic, one of the best solid state power amplifiers ever.

In very good condition. Recently serviced at Len Wallis Audio.

In 1978, the 400 Series Two was introduced. This model was new, inside and out. The owners manual gave a rated output of 210 watts per channel. More important were the improved specifications. The old-style VU meters were gone. In their place were two multi-LED output meters, shared with the 700 and D-500 Series Two amps. Output from each channel could now be controlled by a knob beneath each meter.  Rack handles were now standard. The 400 Series Two also featured redesigned heatsinks with more surface area, like those use on the 700. When Pioneer acquired Phase Linear in 1979, it sought to improve the specs on the amplifiers even further. In 1980, the 400 had lower THD and IMD of only 0.009%. The price of the 400 had risen throughout the late 1970s, and in 1980 it listed for $700. In 1981 it rose to over $800.

Description

The Phase Linear 400 is the most advanced amplifier that today's (late 70s) technology can produce.

A new generation of extremely fast, high energy silicon output transistors, and a host of new materials and techniques only dreamed of a short time ago has made possible an amplifier with performance characteristics that extend virtually beyond the limits of measurability.

At 20 cycles per second, damping exceeds one thousand.

Distortion is so low that it must be measured with only the finest laboratory equipment.

Continuous power levels can be delivered into 8 ohms from 20 cycles per second to beyond 20,000 cycles per second.

Specifications

• Power output: 210 watts per channel into 8Ω (stereo)

  Frequency response: 20Hz to 20kHz

  Total harmonic distortion: 0.25%

  Damping factor: 1000

  Input sensitivity: 1.7V

  Signal to noise ratio: 100dB

• Stereo amplifier with 210 watts per channel into 8 ohms.
  2 Multi-LED output meters. Power output 210 watts minimum RMS per channel into 8 ohms from 20 Hz to 20 kHz with no more than 0,09 total Harmonic Distortion.
  Continuous power 260 watts per channel into 8 ohms @ 1000Hz; 360 watts per channel into 4 ohms @ 1000 Hz.
  Typical total harmonic distortion 0,09% @ rated power output into 8 ohms @ 1000 Hz; 0,09 @ rated power output into 4 ohms @ 1000 Hz. Intermodulation disiortion (60 Hz : 7 kHz = 4 : 1) less than 0,09 @ rated power output into 4 ohms.
  Frequency response 12 Hz to 40 kHz, + 0 - 1 dB. Signal to noise ratio 110 dB (IHF "A-weighted). Residual noise 120 microvolts (IHF "A-weighted"). Daming factor 1000:1 @ 1000 Hz. Input impedance 33K ohms minimum. Imput sensivity 1,0 Volt RMS @ rated power output. Speaker impedance: Will accept 4 ohm or greater speaker load. Slew rate better than 18 Volts/microseconds. Rise time (small signal) less than 4,0 microseconds. Phase shift 0 degrees @ 20 Hz lagging 18 degrees @ 20 kHz. Power requirements 60 Hz, 120 Volts AC (USA and Canadian models) or 100 - 120 Volts/220 - 240 Volts AC, 50/60 Hz. Power comsumptions 1200 watts (10 Amps) maximum @ rated output.

• Net weight 
• 16 kg