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Input channels not working. Needs service. This was pulled from a working environment. Please look at all pictures before purchasing, only what is included in pictures is included in sale.Will ship same day purchased in a professionally packaged box. (D)S47R
At this price point, the obvious alternative is a non-modernized PAS-3 that often requires $300 in upgrades for decent sound, yet this Dynaco PAS 3 listed for US$400 is a strong bargain. According to our listings database, the median used price is US$437, with the 25th percentile at US$419; since US$400 sits below that threshold, it is a genuine deal for a well-loved preamplifier.
The PAS 3 remains a top choice for its warm, musical tone and robust build, often upgraded with new capacitors to enhance clarity. Its original-owner condition and potential for further modification offer meaningful upside, making this a prime buying opportunity rather than a risky purchase. With no material caveats at this price, it stands as an excellent entry into vintage Dynaco hi-fi.
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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