Kenwood KA 8004 (1973-1976)

At 13.5kg, it is a heavy, serious amplifier built to keep the sound clean.

Overview

The Kenwood KA 8004 has no brushed chrome and no glowing VU meters. This integrated amplifier was built between 1973 and 1976 and engineered for performance, not looks. Owners report it as a no-nonsense workhorse from Kenwood's early high-fidelity push, when Japanese manufacturers were rapidly closing the gap with Western audio giants. It isn't flashy, but it commands respect.

The specs suggest a clean, extended performance. Frequency response runs from 10Hz to 100kHz, far beyond the audible range, and total harmonic distortion is rated at just 0.08%. Signal-to-noise ratio is 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). That makes it compatible with a wide range of source and power amplifier pairings.

Power output is a point of contention. 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. No manufacturer documentation confirms either figure, so collectors treat the 70W figure as the most complete documented spec, though real-world output may vary with condition and load. The amplifier is designed to drive loads between 4Ω and 16Ω, which gives some flexibility with speakers. Whether it delivers depends heavily on maintenance. These units spent decades on shelves, and time takes its toll.

Specifications

Manufacturer	Kenwood
Model	KA 8004
Product Type	Stereo Integrated Amplifier
Year of Production	1973-1976
Power Output	70 watts per channel into 8Ω (stereo)
Frequency Response	10Hz to 100kHz
Total Harmonic Distortion	0.08%
Signal to Noise Ratio	90dB (MM), 74dB (line)
Input Sensitivity	2.5mV (MM), 150mV (line)
Output	150mV (line), 1V (Pre out)
Speaker Load Impedance	4Ω to 16Ω
Semiconductors	54 x transistors, 19 x diodes, 2 x IC
Dimensions (W x H x D)	440 x 150 x 370mm
Weight	13.5kg

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, which suggests a coordinated system approach. The KA series would later produce more celebrated models like the KA-9100. The KA 8004 was 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 with condition and function. 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. Units sold "for parts or repair only" show the risk 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, which makes it a relatively accessible project for the DIY-inclined. However, one Audiokarma thread warns of units that, even after restoration, can still "sound AWFUL."

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