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These are new old stock MIL spec 12AX7 equivelents made in USA. The 5751 has slightly less gain than a regular 12AX7 for lower noise and improved stability. Available only while stock lasts as we have limited stock of these USA made quality tubes.
A$51 for a used Philips 12AX7 is fair to slightly strong rather than a steal, because current used 12AX7 pricing in Australia for branded tubes commonly sits around A$30 to A$80, with Philips-branded examples often showing up around A$50 to A$80 and premium NOS pieces much higher. At this level, you’re paying sensible money for a known-name valve without drifting into collector pricing.
What makes it worthwhile is the Philips house sound: generally solid gain, good balance, and a reputation for dependable, low-drama performance in preamp positions. If the tube tests strong, is quiet, and the seller can confirm low microphonics, it’s a perfectly reasonable buy for anyone wanting a musical, trusted 12AX7 rather than gambling on an anonymous budget tube.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Founded in Eindhoven, Netherlands, in 1891 by Gerard Philips, an engineer, and his father Frederik, a banker, Philips began as a modest light bulb manufacturer, quickly evolving into a global electronics powerhouse through relentless innovation. The brothers' early focus on quality incandescent lamps laid the groundwork for expansion into radios, televisions, and audio milestones like the 1963 compact cassette and the 1982 Compact Disc co-developed with Sony. This heritage of pioneering formats that reshaped home entertainment cements Philips as a cornerstone of 20th-century audio history.
Philips has long excelled in consumer audio categories, from vintage turntables and cassette decks to amplifiers, speakers, and complete hi-fi systems, often blending cutting-edge tech with practical design. Iconic products like the first CD player (CD-100) and early wireless Streamium systems highlight their prowess in optical media, portable recording, and integrated sound solutions, while forays into headphones and even acquiring Marantz underscored a broad portfolio.
Today, Philips occupies a solid mid-tier position in the hi-fi market, prized by savvy buyers for reliable, value-driven performance rather than ultra-high-end exotica. No longer a full-spectrum electronics giant—having pivoted to health tech—its licensed audio branding delivers competent, innovation-rooted gear that's accessible yet evocative of golden-era nostalgia, appealing to both modern enthusiasts and vintage collectors.
See all Philips listings on RADAR.
