NAKAMICHI 410 + NAKAMICHI 420

Second-hand, both of them have some scratches (see pictures). Without its original package.

NAKAMICHI 410 Preamplifier

The Nakamichi 410 is a preamplifier designed with innovative solutions to ensure a clean signal and distortion-free reproduction. At the heart of its circuit is an exclusive triple-transistor input stage, developed to reduce thermal noise and improve the signal-to-noise ratio by approximately 10 dB, a particularly significant advantage for MC cartridges.

The internal architecture features a common-emitter amplifier in the first two stages, while the output stage uses a class A push-pull circuit. Unlike traditional differential preamplifiers, the 410 employs a buffer amplifier to eliminate low-volume distortion, maintaining high sonic transparency across the entire dynamic range.

The attention to build quality is reflected in the use of high-end components, including metal film resistors, precision capacitors, 3mm tinned copper plates for connectors, and epoxy-based printed circuit boards. A toroidal transformer with an oriented core ensures stable power supply and reduces magnetic leakage to imperceptible levels.

The tone control, mounted on a separate board, only activates when switched on, preserving the signal purity in flat mode. The integrated subsonic filter protects reproduction from unwanted frequencies, while the phono input sensitivity selector allows for adjusting the gain to the cartridge level. With a fixed impedance of 100 kΩ, it also supports direct connection of MC cartridges.

The high-precision detent volume control offers 2 dB increments and ensures perfect channel balance even at low levels, while the automatic loudness function adapts the frequency response to the selected volume for a consistently balanced listening experience.

NAKAMICHI 420 Power Amplifier

The Nakamichi 420 is a power amplifier produced between 1977 and 1979, designed to be paired with the Nakamichi 410 preamplifier, creating a complete and cohesive amplification solution in both performance and design.

With a maximum output of 50 watts per channel at 8 ohms, the Nakamichi 420 delivers exceptional sound quality, maintaining total harmonic distortion below 0.02% and a signal-to-noise ratio of 110 dB. It features an RCA preamplifier input and terminals for connecting speaker cables directly, making it easy to drive a pair of speakers.

Its sober design and compact dimensions make the Nakamichi 420 a timeless-looking amplifier, perfect for pairing with the 410 preamplifier to create a high-quality, cohesive audio system.

Technical specifications NAKAMICHI 410:

• Frequency Response: 20Hz to 50kHz
• THD: 0.003%
• Input Sensitivity: 2mV (MM), 100mV (Line)
• S/N Ratio: 80dB (MM), 102dB (Line)
• Output: 100mV (Line), 1V (Pre Out), 5V (Pre Out Max)
• Semiconductors: 63 x Transistors, 12 x Diodes, 1 x Zener Diode
• Dimensions: 400 x 80 x 215mm
• Weight: 4kg

Technical specifications NAKAMICHI 420:

• Output Power: 50 watts per channel at 8Ω (Stereo)
• Frequency Response: 5Hz to 50kHz
• THD: 0.02%
• Damping Factor: 100
• Input Sensitivity: 1V
• S/N Ratio: 110dB
• Dimensions: 400 x 80 x 225mm
• Weight: 7kg