{"product_id":"yamaha-a-420","title":"Yamaha A-420","description":"\u003cp\u003eYamaha A-420 Natural Sound Stereo Amplifier — Made in Japan 1986 — Fully Serviced \u0026amp; Tested — Black Panel\u003c\/p\u003e\n\u003cp\u003eAnother 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.\u003c\/p\u003e\n\u003cp\u003eService performed:\u003cbr\u003e• Caustic glue removed from board and cap areas (a known failure point on Yamaha gear of this era)\u003cbr\u003e• Volume\/balance\/tone pots cleaned, lubricated, and tightened\u003cbr\u003e• Light coat of DeoxIT applied to the boards for contact cleaning and corrosion protection\u003cbr\u003e• Full functional test across all channels\u003c\/p\u003e\n\u003cp\u003eSpecs:\u003cbr\u003e• 50 watts RMS per channel into 8Ω, 20Hz–20kHz, 0.015% THD\u003cbr\u003e• Dynamic Power (IHF): 85W\/115W\/120W into 8Ω\/4Ω\/2Ω\u003cbr\u003e• Low-Noise FET Input, switchable MM\/MC Phono Equalizer with built-in subsonic filter\u003cbr\u003e• Continuously Variable Loudness Control\u003cbr\u003e• Inputs: Phono, Tuner, CD, Video\/Aux, Tape (Rec Out\/PB)\u003c\/p\u003e\n\u003cp\u003eWhat you're getting:\u003cbr\u003e• Black panel — no yellowing, no fading\u003cbr\u003e• Tested and listening-room ready\u003cbr\u003e• 30-Day Warranty Included\u003c\/p\u003e\n\u003cp\u003eBlack Panel Audio is a Las Vegas–based restoration shop specializing exclusively in black-panel-era Japanese hi-fi. Curated. Not an online yard sale.\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":43821505445949,"sku":null,"price":295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/browser-download-20261008T141007.660656417Z-2.jpg?v=1792036261","url":"https:\/\/blackpanelaudio.com\/products\/yamaha-a-420","provider":"Black Panel Audio","version":"1.0","type":"link"}