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The Dynaco PAS is a classic vacuum tube stereo preamplifier designed by David Hafler, widely known as one of the most popular and affordable entry points into vintage tube audio. This one has just been serviced. All pots and switches have been cleaned and lubricated, Tube sockets re-soldered, Fully tested, Looks and sounds Wonderful. Core Specifications • Tube Complement: 4 x 12AX7 (ECC83) for phono and line stages, plus 1 x 12X4 tube rectifier • Frequency Response: 10 Hz to 40 kHz • Total Harmonic Distortion (THD): 0.05% • Gain: 60 dB (Moving Magnet / Phono), 20 dB (Line) • Signal-to-Noise Ratio (SNR): 74 dB (MM) • Dimensions: 13.5 x 4.25 x 8 inches (343 x 108 x 203 mm) • Weight: 11 lbs (4.99 kg)
Compared with buying another vintage tube preamp at this money, this is a fair, sensible price rather than a bargain. At US$599, it sits above the US$448 median for 68 comparable listings, but well below the US$905 75th percentile; the “serviced” status helps justify the premium if the work was thorough and documented.
The PAS is a genuine classic: a full-function tube preamp with a useful MM phono stage, flexible inputs, and the warm, organic midrange that makes vintage Dynaco gear so appealing. It is also a famously modifiable platform, so a properly restored example can be very enjoyable without needing immediate intervention. Ask what “serviced” includes—especially power-supply parts, selenium rectifier replacement, controls, sockets, hum, and phono performance—but don’t treat age alone as a reason to walk away. At US$599, clean operation and credible service records make this a worthwhile enthusiast buy.
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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