Nakamichi Stasis PA-7 Power Amplifier @200W Threshold Licensed Made In Japan

Item: Nakamichi Stasis PA-7 Power Amplifier @200W

Condition: 8/10. Item is in excellent original working condition. In good physical condition as well. Rarely used.This monster can drive most speakers with ease.

This was Nakamichi top-of-the-line power amp. Nelson Pass circuitry.

Price: sold

Contact: 012-3816611

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High-end audio enthusiasts may experience a sense of deja vu when they see the Nakamichi PA-7 power amplifier or read Nakamichi's highly informative brochure on it. The word "Stasis" displayed prominently on the amplifier's front panel is a clue that it uses circuitry designed by Nelson Pass, who is responsible for the Stasis amplifiers manufactured in the U.S. by Threshold Corporation, and licensed to Nakamichi by Threshold (Stasis is a Threshold trademark). The Nakamichi Stasis PA-7 is rated to deliver 200 watts per channel into 8 ohms, or 330 watts into 4 ohms, from 20 to 20,000 Hz with no more than 0.1 percent total harmonic distortion.

In the words of its front-panel inscription, the Nakamichi PA-7 is an "Inherently Stable/Uniform Impedance Amplifier." A key difference from conventional amplifier circuitry is that the Stasis circuit design uses no overall ("global") negative feedback. Ordinary negative-feedback amplifiers require careful control of their phase-shift and frequency-response characteristics, as well as of the reactive component of the load impedance, in order to achieve unconditional stability. Some audiophiles have experienced amplifier oscillation, which can cause damage to the speakers, as a result of excessive load capacitance from certain speaker cables or other sources. Because the performance of the Nakamichi PA-7 is virtually independent of the load characteristics, signal dynamics, and spectral content, it is not subject to these undesirable side effects.

The PA-7's circuit topology uses a highly linear, low-current, Stasis voltage amplifier section, operating without global feedback, in parallel with a pair of high-current output stages. These output stages, which supply the large currents needed by a speaker load, are described as positive and negative Current-Mirror Bootstraps. Although the low-power Stasis section defines the output-voltage waveform, its current output is only enough to correct for residual distortions within the Current-Mirror Bootstrap stages. The output section of each channel employs sixteen high-power transistors: fourteen connected in two groups of seven to form the positive and negative Current-Mirror Bootstraps, the other two in the Stasis amplifier section. The output-current capability is rated at 14 amperes per channel continuous or 50 amperes peak.

The Nakamichi PA-7 is a massive amplifier, with heavy heat sinks along each side and contoured handles to assist in handling its 59-1/2 pound weight. Much of its interior volume is occupied by a 700-watt toroidal power transformer and a total of 132,000 microfarads of power-supply filter capacitance. The speaker outputs on the rear panel are multiway heavy-duty binding posts that accept dual bana-na-plug connectors. The input phono jacks are gold plated. Rubber "feet" on the back of the amplifier make it possible to rest it on its back without damage to it or the supporting surface.

The only front-panel control is a large, flat plate that operates the power switch. There are no level adjustments. A green light bar above the switch serves as a pilot light, and two tiny red LED indicators near the top of the panel flash to show the onset of clipping in the left and right channels. The PA-7 is 17-1/8 inches wide, 16-1/2 inches deep, and 7-7/8 inches high. It is finished entirely in black with gold markings.

• Frequency response: 20Hz to 20kHz
  Total harmonic distortion: 0.1%
  Damping factor: 60
  Input sensitivity: 2V
  Signal to noise ratio: 120dB
  Semiconductors: 16 x output transistors per channel
  Dimensions: 435 x 200 x 421mm
  Weight: 27kg / 60 lb 
  
  

Website:

https://www.tonepublications.com/old-school/nakamichi-pa-7-amplifier/

https://www.ebay.com/itm/Nakamichi-PA-7-Stasis-Threshold-Licensed-200W-ch-Stereo-Power-Amplifier/133221877552?hash=item1f04a48730:g:e0YAAOSwPGBduM3H

https://www.ebay.com/itm/NAKAMICHI-PA-7-AMPLIFIER-W-POWER-CORD/293201359725?hash=item444429b36d:g:8s0AAOSwnh5cCA1O

http://www.hifi-classic.net/review/nakamichi-stasis-pa-7-439.html

http://www.audioreview.com/product/amplification/amplifiers/nakamichi/pa-7.html


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