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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-K750P 5.1 channel A/V receiver, fully tested and confirmed working. All channels output clean audio, the AM/FM tuner locks onto stations properly, and all inputs and outputs are functioning as expected. Unit is in good used condition with minor wear consistent with age and use. Remote not 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 All six channels were tested and confirmed to deliver clean, distortion-free audio output. The AM/FM tuner was verified to tune and lock onto stations across the full band. All input sources, speaker terminals, tone controls, and balance were exercised and performing correctly. Shipping & Returns Fast, insured shipping from Minnesota. Free 30-day returns. Item is carefully packaged for safe delivery.
This is a fair ask: at US$70, it lands right on the US$70 median and sits between the US$55 25th percentile and US$80 75th percentile, so it’s priced in line with the recent used market. It’s not a bargain, but it’s not ambitious either.
For a Sony 5.1-channel surround piece, the appeal is usually solid multi-channel performance and the easy system-matching that Sony gear tends to offer in home-theater setups. At this price, the buy makes sense if it’s complete and working, especially with the original remote, calibration mic, or matched speakers/cables if applicable; if any of those are missing, I’d want a little room below US$70 because replacement bits can erase the value quickly.
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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