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The Dyanco PAS-3X stereo preamplifier is a versatile two channel control centre which permits either monophonic or stereophonic reproduction from any program source, with any modern amplifier. Tested and properly working SpecificationsFrequency response: 10Hz to 40kHzTotal harmonic distortion: 0.05%Gain: 60dB (MM), 20dB (line)Signal to noise ratio: 74dB (MM)Valve complement: 4 x 12AX7 (ECC-83), 1 x 12X4Local pick up / inspection / purchase available at Archer High Fidelity in Falls Church, VA. We are a vintage sales and service specialist covering the Washington DC metro area.All major credit cards accepted, as well as PayPal, check on clearing, and Venmo.Any other questions, please feel free to ask.
At US$480, this lands right on the median of the recent used market for this piece, so it reads as a fair, in-line asking price rather than a bargain or an overreach. With a 25th percentile of US$219 and a 75th percentile of US$920, this sits squarely in the normal range for a clean, sellable example.
The PAS-3 remains popular because it delivers that classic Dynaco tube-preamp character: open, lively, and easy to pair with a wide range of vintage or modern power amps. At a fair price, the real upside is getting a well-known, serviceable platform that many hobbyists like to keep and improve. I’d value clarity on service history, tube condition, and whether any original parts or a recent rebuild are included, but this is the kind of listing that can make sense for a buyer who wants the sound and the project.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Dynaco emerged in 1955 from Philadelphia, Pennsylvania, when hi-fi pioneer David Hafler partnered with engineer Ed Laurent to form the Dyna Company. Hafler brought expertise from his earlier Acrosound venture, which produced high-quality output transformers starting in 1950. The duo targeted the burgeoning hi-fi market with affordable, DIY-friendly kits, launching the Mk II 50-watt tube amplifier shortly after incorporation and relocating to a former chocolate factory for expanded operations.
The brand specialized in tube amplifiers that defined its legacy, including the iconic Stereo 70—over 350,000 units sold—alongside models like the Mk III. Dynaco expanded into FM tuners such as the FM-1, bookshelf speakers like the A-25, solid-state amps, and innovative systems like the Dynaquad for simulated four-channel sound. Late-1970s efforts included the Phase III speakers, though the company shifted toward kits and components emphasizing value and performance.
Dynaco holds a revered position as the era's top-selling tube amp maker, beloved by budget-conscious audiophiles for reliable, high-value hi-fi. Liquidated in 1980 after Hafler's sale to a toy firm, its vintage gear remains a collector's staple, with later revivals by Panor Corporation producing replicas for tube enthusiasts seeking that classic warmth and build-it-yourself appeal.
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