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With no newer models supplanting the Audion MkIII monoblocks, timing this listing is neutral—demand holds steady among tube amp collectors who prize AGD's single-ended triode purity. At USD6,199, the asking price sits squarely at the median for recent comparable used pairs (USD4,099–USD6,974 range), making it a fair deal without screaming bargain or overreach. These cult favorites rarely dip much lower unless cosmetically challenged.
Buyers, prioritize verifying the output transformers—early MkIIIs can suffer saturation from heavy use—and confirm all original chassis mods, fuses, and Eichmann binding posts are intact. Test for channel balance under load; tube life is finite, so fresh NOS replacements (like 300B or VT62) should be budgeted at USD500–800/pair.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
# AGD Productions
AGD Productions, Inc. is a Los Angeles-based high-end audio manufacturer founded by engineer and designer Alberto Guerra. Operating from Palos Verdes Estates, California, the company has established itself as a pioneer in GaN (Gallium Nitride) power semiconductor technology applied to Class-D amplification. While exact founding details are not definitively documented in available sources, AGD has built its reputation over recent years through innovative product development and handcrafted manufacturing in the USA.
The brand specializes exclusively in power amplifiers, positioning itself at the forefront of GaN-based amplifier design. AGD's product lineup includes the iconic GaNTube series, the Gran Vivace monoblocks, the Audion, the compact FORTE, and the SOLO integrated amplifier, alongside their recent all-in-one ALLEGRO system. Each component reflects the company's philosophy of merging technical precision with musical transparency and aesthetic refinement. The amplifiers range from approximately $1,500 to $27,400, reflecting their high-end positioning.
AGD Productions occupies a distinctly premium niche within the high-end audio market. The brand appeals to discerning audiophiles seeking cutting-edge amplification technology combined with meticulous engineering and design artistry. Their reputation rests on proprietary GaN power technology, dual-mono architecture, and ultra-low-noise power supplies—technical credentials that resonate strongly with serious collectors and music enthusiasts willing to invest substantially in amplification excellence.
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