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Mullard M8136 / CV4003 / 12AU7 NOS Valves/Tubes A matched pair of NOS (used ~2 hours) MULLARD M8136 / CV4003 / 12AU7 - box plate, wrinkle glass - regarded as one of the best 12au7 available Condition: As New / Mint Payment Method: Paypal, EFT, COD Region/State: (VIC) Victoria/Australia By Lushds 0 Comments Secure Ad AUD $350 Date: August 10, 20241 yr
It's a seller's market for NOS Mullard M8136 CV4003 12AU7 tubes right now, with demand outpacing supply for these vintage treasures. At AUD350 for unknown condition, this listing feels ambitious—recent comparable AUD sales cluster tightly around a median of AUD333 (25th percentile AUD326, 75th AUD341), putting it just above the top end of fair value. Without condition details, you're paying a premium for the Mullard badge.
Buyers, verify matched pairs if stereo use is planned, as Mullard 12AU7s often suffer microphonic hum from age-related filament wear—test under load. Probe for original boxing or military markings to confirm NOS authenticity, and insist on seller photos of getter rings (should be silvery, not greyed). Skip if no returns.
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.
