Nakamichi CA-7A

The Nakamichi CA-7A is a control amplifier, a full-function preamplifier, and it was the command center of Nakamichi's Series-7 component system. It was pitched alongside the PA-7 STASIS power amplifier, ST-7 tuner, OMS-7 CD player, and CR-7A cassette deck. All of them were designed for unified remote control operation. Audio (October 1988) ran a full-page advertisement calling the Series-7 components "the finest we make," aimed at "the perfectionist who desires remote accessibility and uncompromised performance."

The CA-7A is all-analog, finished in black, and weighs 20 lbs (7.2 kg). It has dedicated moving-coil and moving-magnet phono inputs. The MC stage is built around Toshiba JFETs graded to Idss BL (6.0-12 mA). A motorized volume control allows remote operation. The preamp can also control compatible Nakamichi cassette decks such as the CR-7A and CR-5A when connected via the system remote bus. There are seven line-level inputs, and power consumption is rated at 42 W.

Production years are not firmly documented. One owner reports buying the unit at Paris Audio in Torrance, CA around 1985-1986. A dealer listing suggests 1987-1989. No original price from a primary source has been confirmed, though an unsourced notation in a 1989 buyer's guide lists $2,499.

The documented issues are all in the phono stage. A dead MC input has been reported, and it prompted discussion about replacing the input JFETs with matched Idss units. One service example notes that the left-channel output jacks were professionally replaced. No other common failures or maintenance patterns have surfaced in the available record.