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Tested on Dynaquick 500 for Mutual Conductance tested in parallel VOM 1)2150 Made in Great Britain code B1A/138-1022VOM 2)1900 Made In Great Britain 161/BOL 132-1022VOM3)2100 Made Zin Great Britain B1B -138-1022GE 1)1850 Great Britain HW 188-5 /B5A5GE2) 1920 Great Britain HW 188-5 163/B6C1Hammond Tube Made In Holland 64-37 tested @2150 Micromhos,No shorts or Gas Leaks present.
Condition is unknown, so at US$125 this sits above the usual used market for these tubes: versus the recent comps, it’s over the US$107 75th percentile and well above the US$47 median. That makes it feel ambitious rather than a bargain, unless the seller can substantiate exceptional test results, matched sections, or especially desirable branding/printing.
Mullard 12AX7s are prized for their smooth, open midrange and low-noise performance, which is why collectors and tube-rollers keep chasing them. The upside here is the mix of 1960s-era glass and assorted OEM markings, but with no condition details I’d want clear photos, test readings, and confirmation of the exact quantities/brands before paying this much.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Captain Stanley R. Mullard founded the Mullard Radio Valve Company in 1920 in the United Kingdom, initially to produce high-power transmitting valves for the British Admiralty. Drawing from his engineering background and passion for music, he expanded into audio components, creating vacuum tubes renowned for their reliability and superior sound quality. Acquired by Philips in the 1920s, the brand grew into a dominant force in valves and semiconductors, with production spanning facilities in Mitcham and Southampton.
Mullard focused primarily on vacuum tubes—or "valves"—that powered high-fidelity amplifiers and professional recording equipment, alongside early transistors and audio drivers. Historical products like the 1960s Mullard 510 valve amplifier exemplified their expertise in hi-fi amplification, while their hand-assembled valves became staples in studio and home systems. Though not a modern maker of speakers, turntables, DACs, or headphones, their components influenced entire audio chains.
Today, Mullard holds a revered position as a vintage high-end icon among audiophiles and collectors, celebrated for the "Mullard sound"—warm, detailed, and musical. Reissues and NOS tubes command premium prices in the boutique market, cementing its legacy over a century of craftsmanship amid technological shifts.
See all Mullard listings on RADAR.
