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Optimus Prime's Stereo Equipment Old School Audio - Old School Prices - Professionally Tested Product Description Up for sale is a Sony STR-K790 5.1 channel A/V receiver, fully tested and confirmed working. All channels power up cleanly, the AM/FM tuner locks onto stations without issue, and all inputs and outputs were verified functional. Remote is included. Please review all photos for details. Highlights At A Glance ✔ Fully tested and verified ✔ Good cosmetic condition with minor wear from use ✔ Free 30-day returns ✔ Fast, insured shipping Testing & Verification This Sony STR-K790 was bench tested through all six channels with speaker loads confirmed, and surround sound decoding for Dolby Digital and DTS was verified active. The AM/FM tuner was tested across multiple stations with solid signal lock, and all RCA inputs and outputs were checked for clean signal passing. Balance, volume, and tone controls were exercised through their full range with no issues found. Shipping & Returns Fast, insured shipping from Minnesota. Free 30-day returns. Item is carefully packaged for safe delivery.
At US$80, this sits a touch above the US$70 median but still inside the normal spread, so it reads as fair to slightly firm rather than a bargain. It’s also below the US$80 75th percentile, which means the ask is not out of line for the current used market.
What makes it worthwhile is the usual Sony strength in this category: these surround pieces tend to be straightforward, reliable, and easy to integrate if you’re matching an existing Sony setup or replacing a missing channel. At this price, the upside is in getting a complete, working unit with the right cables, remote, and no cosmetic drama; since condition is unknown, I’d confirm power-on, all speaker outputs, and that it’s not being sold as parts before committing.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Sony emerged from the ruins of post-World War II Japan, founded on May 7, 1946, by Masaru Ibuka and Akio Morita as Tokyo Tsushin Kogyo K.K. in Tokyo's Nihonbashi district. Starting with radio repairs and Japan's first magnetic tape recorder, the duo secured transistor licensing from Bell Labs, pioneering the TR-55 transistor radio in 1955. Renamed Sony Corporation in 1958—from the Latin "sonus" for sound—the brand symbolized Japan's ascent from cheap imitations to innovative leadership, fueled by Ibuka's engineering prowess and Morita's global marketing vision.
Sony's hi-fi legacy spans headphones, amplifiers, speakers, turntables, and DACs, alongside landmark formats like the Compact Disc in 1982 and Blu-ray. Iconic products include the Walkman for portable audio revolution and Trinitron televisions, blending consumer accessibility with cutting-edge tech. Today, offerings like the Signature Series headphones and ES amplifiers target discerning listeners seeking refined soundstaging and dynamic range.
Positioned as a mid-to-high-end powerhouse, Sony commands respect among knowledgeable buyers for blending mass-market reliability with premium performance, outpacing many pure audiophile brands in innovation and value. Far from vintage relic or niche boutique, it dominates with forward-thinking engineering, holding strong market share in headphones and streaming ecosystems.
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