Yamaha A-420 Black

Yamaha A-420 Natural Sound Stereo Amplifier — Made in Japan 1986 — Fully Serviced & Tested — Black Panel Another one back from the bench. This Yamaha A-420 was manufactured in Japan in January 1986 (per the factory QC stamp on the rear panel) and has been through Black Panel Audio's full inspection and service process. Service performed: • Caustic glue removed from board and cap areas (a known failure point on Yamaha gear of this era) • Volume/balance/tone pots cleaned, lubricated, and tightened • Light coat of DeoxIT applied to the boards for contact cleaning and corrosion protection • Full functional test across all channels Specs: • 50 watts RMS per channel into 8Ω, 20Hz–20kHz, 0.015% THD • Dynamic Power (IHF): 85W/115W/120W into 8Ω/4Ω/2Ω • Low-Noise FET Input, switchable MM/MC Phono Equalizer with built-in subsonic filter • Continuously Variable Loudness Control • Inputs: Phono, Tuner, CD, Video/Aux, Tape (Rec Out/PB) What you're getting: • Black panel — no yellowing, no fading • Tested and listening-room ready • 30-Day Warranty Included Black Panel Audio is a Las Vegas–based restoration shop specializing exclusively in black-panel-era Japanese hi-fi. Curated. Not an online yard sale.