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Mullard GZ34 type f31, Blackburn I believe 1960 based on the date code, OO getter. It was bought tested like new but I,don't have a tester to test it, aold as is.I've used for a few hours to make sure it's working as it should.Pick up available at Ultimo NSW2007 office hours or Lindfield NSW2070 ...
The Mullard GZ34 is a legendary soft-start rectifier prized for its smooth, musical character and robust construction in high-end tube amplifiers. At A$475, this listing sits above the 75th percentile of A$436 and the median of A$396 from recent Australian comps, making the price ambitious rather than fair. While the Mullard brand commands respect, you are paying a noticeable premium over the typical market range of A$357 to A$436 without confirmed condition details to justify the stretch.
That premium is only worthwhile if the tube is verified as original, tested, and in pristine condition, as GZ34s can suffer from internal shorts or weak emission if mishandled over decades. Given the lack of condition data, this looks like a risky buy at this price point; a genuine deal would sit near A$360–A$390. Wait for a listing with clear testing results or a lower ask before committing, as the upside here doesn’t currently outweigh the cost risk.
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.
