Nakamichi 620 (1978)
The Nakamichi 620 was a tuner-preamplifier introduced in 1978. It was part of Nakamichi's first push into separate electronic components, the "Recording Director Series", which also included the 610 Control Preamplifier, the 600 Cassette Console, and the 630 FM tuner/preamplifier. Nakamichi's own advertising in Audio (March 1977, p.88) described the 620 as offering "no-compromise performance and flexibility that is clearly Nakamichi," and grouped it with the 600 and 610 as elegantly styled components with identical profiles.
Here is what the record shows about the unit itself. Frequency response is rated at 20Hz-20kHz ±0.5dB. The FM tuner section offers mono sensitivity of 1.5 µV and stereo sensitivity of 8 µV, with a signal-to-noise ratio of 75 dB in mono. The chassis measures 420 x 88 x 300 mm (WxHxD) and weighs 6.6 kg.
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