Nakamichi PA-7A II Power Amplifier – 225W/Channel High-End Amp | Nelson Pass Design | Vintage Audiophile
Nakamichi PA-7A II Power Amplifier – 225W/Ch | Nelson Pass Design | High-End Vintage Audio
Experience legendary audio performance with the Nakamichi PA-7A II, a true audiophile-grade power amplifier designed by the renowned Nelson Pass. Delivering a muscular 225 watts per channel into 8 ohms, this amp embodies the best of high-current, wide-bandwidth solid-state design. Whether you're building a reference 2-channel setup or collecting iconic gear, the PA-7A II is a standout.
Key Features:
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225W x 2 @ 8Ω / 330W x 2 @ 4Ω – Effortlessly drives even the most demanding speakers
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Stasis Circuit Topology – Based on Threshold’s legendary designs by Nelson Pass
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Massive Toroidal Transformer – Clean, stable power delivery with dual-mono layout
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Balanced Musicality – Powerful yet smooth, detailed without harshness
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Premium Build Quality – Heavy-duty chassis and audiophile-grade components throughout
Condition:
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Fully tested and working perfectly
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Clean sound with no distortion or channel imbalance
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Excellent cosmetic condition with minor wear consistent with age
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We have not done any recapping
- This unit only had one previous owner
Why Choose the Nakamichi PA-7A II?
This amp represents the pinnacle of Japanese and American collaboration in high-end audio. It’s highly sought after by collectors and revered by audiophiles for its dynamic headroom, clean power, and musical presentation.
Add this iconic piece to your system and rediscover what your speakers are truly capable of.
What’s in The Box?
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Nakamichi PA-7A II Power Amplifier
- Power cord
Nakamichi PA-7A II Specifications
Power Output:
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225 watts per channel @ 8 ohms (both channels driven)
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330 watts per channel @ 4 ohms
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High-current design, stable into low-impedance loads
Circuit Design:
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Nelson Pass–designed Stasis topology (licensed from Threshold)
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Class AB operation with high bias for low distortion
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Dual-mono configuration for improved stereo separation
Frequency Response:
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1 Hz – 100 kHz (+0, –1 dB)
Total Harmonic Distortion (THD):
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Less than 0.003% @ rated output
Signal-to-Noise Ratio:
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Greater than 120 dB (A-weighted)
Damping Factor:
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Greater than 150 @ 8 ohms
Input Sensitivity:
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1V for full output
Input Impedance:
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50 kΩ (RCA unbalanced)
Output Impedance:
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< 0.05 ohms
Power Supply:
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Massive toroidal transformer
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High-capacity filter capacitors for stable current delivery
Connections:
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RCA unbalanced inputs (2)
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High-quality binding post speaker terminals (L/R)
Protection Circuits:
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Thermal protection
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Speaker protection relay
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Short circuit and DC offset protection
Physical:
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Dimensions: 17.3" (W) x 6.6" (H) x 15.8" (D)
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Weight: Approx. 57 lbs (26 kg)
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Chassis: All-metal, rugged construction with rear-mounted heat sinks
Made in Japan – Built to exceptional quality standards during Nakamichi’s golden era
