Nakamichi CA-7 (1980s)

The Nakamichi CA-7 is a control amplifier - Nakamichi's term for a preamplifier - from the company's 1980s era. It was the control center of Nakamichi's high-end Series-7 lineup, which the company marketed to "the perfectionist who desires remote accessibility and uncompromised performance." Audio (October 1988, p.2) ran Nakamichi's advertising for the Series-7 system. The system paired the CA-7 with the PA-7 power amplifier, ST-7 tuner, and related components, and the ad called them "the finest we make."

Documentation on the CA-7 itself is thin. What the record shows is a full-function preamplifier with balanced inputs and outputs, which was unusual for the era, plus conventional phono, tuner, and tape connections. The front panel has a balance control. The unit measures 475 x 90 x 300mm and weighs 6kg. Those figures show up consistently across the databases that list it.

The listed specifications get murky. Most sources agree on a frequency response out to 100kHz and total harmonic distortion of 0.003%. The Japanese fan site Audio Heritage lists different figures: 5Hz-100kHz response and 0.001% distortion. Three sources corroborate the dimensions and weight. The response and distortion figures conflict between sources, and they remain unresolved.

The Vintage Audio Museum archive gives a single listing price of $1,400, with no year attached. Exact production years, phono cartridge loading options, and any design or circuit details are not documented in the available record.

Known specs

Inputs: Phono, Aux 1, Aux 2, Tuner, Tape 1, Tape 2, Balanced
Outputs: Tape 1, Tape 2, Balanced, Pre Out
Frequency response: 10Hz–100kHz (per HiFi Engine / Audio Database); 5Hz–100kHz per Audio Heritage — conflicting
THD: 0.003% (per HiFi Engine / Audio Database); 0.001% per Audio Heritage — conflicting
Dimensions: 475 x 90 x 300mm (W×H×D)
Weight: 6kg