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Here's the perfect companion for the Dynaco Stereo 70 I'm selling separately. The PAS-3 has some useful controls not found on other amps: a stereo separation control, and separate bass and treble knobs for each channel. This can be a problem solver in rooms that require less-than-ideal speaker placement. I've owned this for almost 50 years. It's been very reliable. It's received regular maintenance, but it's needed no repairs. The tubes tested "Good" last winter.
The timing is not the issue here; this is a vintage preamp with a long-established reputation, so the real question is condition and servicing history, not model age. At US$475, it lands a bit above your US$456 75th percentile and above the US$437 median, so I’d call it ambitious, though not absurdly so for a desirable example.
What keeps it interesting is that the PAS 3 remains a classic tube linestage: simple, musical, and very tweakable, with a huge pool of parts, mods, and restoration knowledge behind it. If the unit is clean, original enough, and has been properly gone through, there’s real upside in a well-loved piece like this; if not, the age of the platform means caps, switches, and general service wear matter a lot more than the name on the faceplate.
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.
