Experience the surprising warmth, punch, and reliability of classic Japanese solid-state hi-fi with the Kenwood (Trio) KA-6004 Integrated Amplifier. Produced in the mid-1970s, the KA-6004 represented Kenwood’s dedication to precision engineering, clean design, and musical sound. This unit has been fully serviced and restored, making it ready for modern listening while preserving its vintage charm.
This is a dual-voltage system so while it is a JDM unit, it will operate on 120-volt US power.
Features & Specifications
Era: Early to mid-1970s (Trio branding in Japan, Kenwood export model)
Design: Solid-state integrated amplifier with discrete transistor construction
Power Output: ~45 watts per channel into 8Ω
Frequency Response: 10 Hz – 70 kHz (±1 dB)
Total Harmonic Distortion (THD): ~0.1% at rated output
Inputs: Phono (MM), tuner, auxiliary, tape
Outputs: A/B speaker switching for two pairs of speakers
Controls: Bass, treble, balance, loudness, filters, tape monitor
Construction: Solid metal faceplate, aluminum knobs, and wood side panels for vintage appeal
Restoration & Service
Thoroughly cleaned and any suspect transistors/diodes/resistors replaced for reliability. Full capacitor replacement.
All switches, controls, and pots cleaned for smooth, noise-free operation
Bias and DC offset checked and set to spec
Tested on modern speakers and turntables – fully functional and ready to enjoy
Why the Kenwood / Trio KA-6004?
A classic mid-1970s Japanese integrated amplifier with a clean, musical sound
Built to last, with discrete solid-state circuitry and excellent component quality
Offers both vintage character and daily usability
Collectible piece from the golden age of Kenwood (Trio in Japan) hi-fi design
Condition
Cosmetic: Excellent vintage condition with minor wear consistent with age
Functional: Fully restored and performing to original factory standards
What’s Included
1x Fully restored Kenwood / Trio KA-6004 Integrated Amplifier
Power cord (original or period-correct replacement)