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Dynaco SCA-35 Integrated Amplifier (Valve) With much regret I’m selling my beloved Dynaco SCA-35. In excellent serviced condition, it’s a delightful unit, but I have too many amps. - A classic tube amp Dynaco called the “Stereo Control Amplifier”, a David Hafler design. - 17.5W per channel. 120V original US model. - It has the original legendary Dynaco z565 output transformers. - Serviced and lightly modified (reversible) by Trevor Lees in approx 1990, including: - Tone section bypassed (a common mod) - Hum pots bypassed. - Installed ceramic valve sockets for the power tubes. - Upgraded with W
A$800 is a strong deal for this one: it sits well below the A$888 25th percentile and under the A$925 median of the recent AUD comps, so the price has real buyer appeal rather than just looking “reasonable.”
What makes it worth chasing is the SCA35’s reputation as a compact, musical vintage valve integrated with an easygoing, engaging presentation that still has plenty of fans. In excellent condition, the upside is especially good if it’s been serviced properly and the essential bits are intact; at this level, I’d be looking hard for clean output, quiet operation, and evidence of recent maintenance, because age and service history matter more than cosmetics on these.
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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