ขาย Power Amp NAKAMICHI 620 สวย เสียงดี หายาก ทำงานสมบูรณ์ Made in Japan
ขาย Power Amp NAKAMICHI 620 สวย เสียงดี หายาก ทำงานสมบูรณ์ Made in Japan
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Nakamichi 620
Stereo Power Amplifier (1977-79)
Description
Nakamichi's Complete Mirror design brings a level of performance to class B amplifiers that
was formerly associated only with class A amplifiers.
The 620 is closer to a pure class B amplifier than anything else that has gone before. The
first stage of the 620 is a differential amplifier with "current mirror" loading. The final section of
the amplifier is a four stage push-pull circuit.
All four stages are full complementary direct coupled, and each stage employs a unique
double NPN/PNP combination for the positive and negative halves. This design eliminates
the errors inherent in even the most carefully matched pairs of NPN/PNP output devices.
These errors, furthermore, are eliminated without the use of bias diodes, bias adjustments
and high idle currents.
The 620, in fact, idles at approximately 1/20 the current of conventional class B power
amplifiers of comparable output power.
This new approach takes full advantage of class B efficiency with the freedom from switching
and crossover distortions that was once thought possible only with class A amplifiers.
Specifications
Power output: 100 watts per channel into 8Ω (stereo)
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.005%
Damping factor: 100
Signal to noise ratio: 120dB
Semiconductors: 3 x ICs, 46 x transistors, 41 x diodes
Dimensions: 400 x 189 x 248mm
Weight: 12.5 kg.
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