Kenwood KA-5010 (1988–1990)

The Kenwood KA-5010 is a stereo integrated amplifier from the late 1980s. It sold in Japan for ¥45,400 and was built in Japan, which the back panel states. It's well specified for the period: 80W + 80W into 8Ω (20 Hz-20 kHz, 0.06% THD), with dynamic power rated at 210W into 2Ω, 170W into 4Ω, and 95W into 8Ω. The phono stage handles both MM and MC cartridges, a meaningful feature on a non-flagship integrated amp of this era. A source-direct circuit bypasses the tone controls, balance, and subsonic filter for a cleaner signal path.

Kenwood put real engineering into this one. The power supply uses a 420 VA transformer and dual 10,000 µF filter capacitors. The output stage uses discrete power transistors - original Sanken devices, per one dealer. The grounding scheme is unusual: a dedicated ground line routes power-supply noise to the speaker terminals, and all ground lines join only at that single point. Mechanical resonance is handled with large 60mm insulators that have foamed rubber on the contact surface, plus a "floating" PCB mounting for the power transistors and heat sink. The front panel is satin black alloy, with large controls for volume, input, and record-out selection. Seven inputs cover CD, tuner, aux, tape, and phono.

The record on this model is thin in places. One source gives the production year as "around 1988" and another gives "1990." No manufacturer announcement was found to settle it, so 1988-90 is the honest compromise. Power consumption is also disputed (240W vs 260W), and weight is listed as both 12kg and 11.7kg. The sources agree on the 80W/8Ω rating, the MM/MC phono stage, the source-direct feature, and the subsonic filter. HiFi-Review (hifi-review.com, accessed via the Archive's research) described the front panel as "hewn from a satin black alloy, punctuated with a series of large controls," which matches the surviving photographs of the unit.

Collector interest exists but is modest. A "junk" condition unit appeared on Yahoo Auctions Japan at ¥3,245. A serviced, near-mint example sold with a six-month warranty from a New Zealand dealer. Repair videos and forum threads exist, which suggests the usual age-related issues, but no systematic failure pattern is documented. The owner's manual (14 pages) is still available.

Known specs, where sources agree:

- Integrated amplifier, 2 channels, made in Japan

- 80W + 80W into 8Ω (20 Hz-20 kHz, THD 0.06%)

- 90W + 90W into 6Ω (THD 0.08%)

- Dynamic power: 210W (2Ω), 170W (4Ω), 95W (8Ω)

- Frequency response: 5 Hz–100 kHz (+0/–3 dB, line to speaker)

- Phono MM: 2.5 mV / 47 kΩ; Phono MC: 200 µV / 100 Ω

- Line inputs: 150 mV / 47 kΩ

- Damping factor: 160 (50 Hz)

- Dimensions: 440 × 148 × 398 mm