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Offered for sale is a vintage Dynaco PAS-3X stereo tube preamplifier, a classic piece of American high-fidelity audio history.This unit retains its original electronic components and has been carefully inspected, tested, and adjusted.Condition: Very GoodOriginal electronic components, with no replacements or modifications.All functions have been checked and tested.Vacuum tubes are in excellent operating condition.Excellent mechanical condition.Original silver front panel and black metal enclosure.The black top cover shows cosmetic wear and would benefit from repainting.Service documentation, including electronic schematics and parts lists, is available.The Dynaco PAS-3X is highly regarded among vintage audio enthusiasts for its classic tube sound and historical significance.An excellent opportunity for collectors and enthusiasts seeking an authentic vintage Dynaco preamplifier.Please examine all photographs carefully, as they form part of the description.
New, the PAS 3X is long discontinued; today’s used examples commonly cluster around US$450–US$600, with tested units often advertised near US$500. At US$473, this is a fair-to-good price rather than a clear bargain—especially if it is working, complete, and includes its original case.
The PAS 3X is the more desirable Dynaco PAS variant, offering classic tube-era warmth, useful tone controls, and a strong DIY/restoration following. It can be an enjoyable, characterful match for efficient vintage systems, and its relative rarity supports the price. The key qualifier is condition: these are old units, so confirm quiet operation, all inputs and controls, hum level, tube complement, and whether the power supply and aging capacitors have been serviced. A documented rebuild would make US$473 attractive; an untested example should sell for less.
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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