NakamichiPA-7usedNakamichi PA-7 Power AmplifierNakamichi PA-7. Very much a classic Nelson Pass designed power amplifier. Original double-box and packing in very clean condition. This one was used to drive current hungry Snell A-III loudspeak...790.00

Nakamichi PA-7 Power Amplifier

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fidelisav 

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8/10
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Ships fromNashua, NH, 03063
Ships toUnited States
Package dimensionsunspecified
Shipping carrierUPS
Shipping costSpecified after purchase
Original accessoriesBox
AverageResearch Pricing

Nakamichi PA-7.  Very much a classic Nelson Pass designed power amplifier.  Original double-box and packing in very clean condition.  This one was used to drive current hungry Snell A-III loudspeakers.  Uses no overall global feedback. 
From Tone Audio:
According to Pass, the original PA-7 (not the PA-7 series II) is “the one you want.”

The PA-7 delivers 200 watts per channel, uses no overall negative feedback (a Pass trademark), and boasts the Stasis section, which consists of a low-power voltage amplifier coupled to the current mirror bootstrap output stage to do all the heavy lifting required for high-power output.

Back in 1989, when Stereo Review featured the PA-7, writer Julian Hirsch measured the PA-7’s output at 253 watts into an 8-ohm load, 400 watts into a 4-ohm load, and 650 watts into two ohms. A quick look under the hood reveals why. A large 700 VA toroidal transformer and a bank of power supply capacitors totaling 132,000 µf proves the PA-7 means business. Such a setup made the PA-7 a perfect choice for demanding loudspeakers and, like the Threshold Stasis amplifiers, it ended up in many systems based around electrostatic speakers or Magnepans. I once used one to drive a pair of Magnepan Tympanis to excellent results.

From Audiophile Addicts:

......essentially a Threshold power amplifier but way better looking and less than half the price.

(Nakamichi was)  supposed to just license his STASIS technology, which combines the benefits of Class A amplification without the drawbacks (runs stupid hot = very low reliability) into a hybrid Class A/Class AB power amplifier with optical bias.  Well, they didn’t just license STASIS.  Rather, the first generation of the PA-7 is a direct copy of the equivalent Threshold amp.  A lawsuit ensues, then Nakamichi releases the PA-7II with an altered design providing 25 more WPC (watts per channel) and a higher price tag.  But everyone knew then and knows now that the original PA-7 was, “the one to get”.   

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