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For parts or repair. Please look at all photos before purchasing, only what is included in the pictures is included in the sale. Will ship same day purchased in a professionally packaged box. (L)S84R
At US$92, this sits well below the US$143 25th percentile and looks like a strong bargain versus the US$205 median used asking price. For a classic Dynaco preamp, that is the kind of number that makes sense to move quickly on if the unit is complete and not obviously hacked.
The PAT-4 is a well-known vintage solid-state preamp with an appealingly straightforward, DIY-friendly lineage and plenty of parts support in the hobby. A clean, original example at this price is attractive for anyone who wants an affordable way into classic hi-fi, but it’s still worth confirming basic function, switch noise, and whether any restoration has been done, since age is the main variable here.
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.
See all Dynaco listings on RADAR.
