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Dynakit Stereo 70 Vacuum Tube Power AmplifierCondition:un-testedPickup Preferred in our Audio Department or shipping can be arranged158 W Clinton StDover, NJ 078017 days a week from 11AM - 6PMOur in-house Technician is available M-F during store hours._______________________________________________________________________________Description:Up for sale is a classic Dynakit Stereo 70 (ST-70) tube power amplifier, one of the most iconic hi-fi amps ever made. Known for its warm, detailed sound and excellent tube-driven performance, this unit is a favorite among audiophiles and vintage audio enthusiasts.Key Features:Stereo tube power amplifierUses EL34 output tubesApprox. 35 watts per channelLegendary Dynaco sound signatureGreat platform for restoration or daily listeningWeight & Dimensions:Weight: ~32 lbs (14.5 kg)Dimensions: 13” W x 9.5” D x 8.5” H
Dynaco’s mono tube amps have a strong reputation for musical, easy-to-enjoy sound and a big following among restorers. At US$1,100, this asking price is well above the recent comparable median of US$599 and also above the 75th percentile of US$762, so it reads ambitious rather than a bargain.
That doesn’t make it a bad amp—these can be very rewarding if properly restored, and good examples often attract steady interest from collectors and DIYers. But at this level, condition matters a lot: you want clear evidence of a competent rebuild, stable operation, and any original parts or cosmetic extras that justify the premium. If it’s unserviced, I’d want a lower number.
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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