Kenwood KA 8004 (1973-1976)

At 13.5kg, it arrives like a statement—solid, serious, and wired for war against sonic slop.

Overview

The Kenwood KA 8004 isn’t a showpiece with brushed chrome or glowing VU meters, but it never needed to be. This integrated amplifier, built between 1973 and 1976, was engineered for performance, not pageantry. Owners report it as a no-nonsense workhorse from Kenwood’s early high-fidelity push, a time when Japanese manufacturers were rapidly closing the gap with Western audio giants. It’s not flashy, but its presence commands respect.

The specs suggest a clean, extended performance: frequency response stretches from 10Hz to 100kHz, far beyond the audible range, and total harmonic distortion is rated at just 0.08%. Signal-to-noise ratio comes in at 90dB for the MM phono input and 74dB for line-level sources, which is respectable though not class-leading. Input sensitivity is 2.5mV for MM and 150mV for line, with outputs of 150mV (line) and 1V (pre out), making it compatible with a wide range of source and power amplifier pairings.

Power output remains a point of contention. While some sources claim 55 watts per channel into 8Ω, the HiFi Engine specification sheet—among the most complete available—lists 70 watts per channel (stereo) into 8Ω. Given the lack of manufacturer documentation confirming either figure, collectors treat the 70W figure as the most complete documented spec, though its real-world output may vary depending on condition and load. The amplifier is designed to drive loads between 4Ω and 16Ω, offering flexibility with a range of speakers. Whether it delivers on its promise depends heavily on maintenance—these units spent decades on shelves, and time takes its toll.

Specifications

Historical Context

It shared design language and era with other models in the KA series, including the KA-8006 and KA-6004, though its exact position in the lineup is not explicitly documented. It was designed to pair with the Kenwood KT-8005 tuner, suggesting it was part of a coordinated system approach. While the KA series would later produce more celebrated models like the KA-9100, the KA 8004 represented an early step in that evolution—a serious amplifier built for accuracy rather than warmth.

Collectibility & Value

Market value for the Kenwood KA 8004 varies wildly, reflecting its condition and functionality. One unit was listed on Reverb for $689, originally priced by the seller at $999, while another was reportedly acquired for just $10 on Reddit—proof that condition is everything. Units sold "for parts or repair only" underscore the risks of buying untested. Common issues include failing plastic toggle switches—dubbed "those pesky plastic toggles" by one Audiokarma user—and power switches that stick or fail. Oxidation on internal controls and aging capacitors are expected, and recapping is frequently mentioned as a necessary restoration step. According to user reports, cleaning the internal controls can resolve many common issues, making it a relatively accessible project for the DIY-inclined. However, one Audiokarma thread warns of units that, even after restoration, can still "sound AWFUL," suggesting that full recovery isn’t guaranteed.

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Related Models

• Kenwood KA 990EX (1980-1981)
• Kenwood KA 400 (1970-1972)
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• Akai AM-2850 (1975)
• Akai AP-206 (1975)
• Nakamichi BX-1 (1985)
• Acoustic Research research-ar-17 (1978)
• Acoustic Research AR-19 (1994)