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Specifications:
Tuning range: FM, MW
Power output: 80 watts per channel into 8Ω (stereo)
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.006%
Damping factor: 45
Input sensitivity: 0.25mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 69dB (MC), 87dB (MM), 95dB (line)
Output: 150mV (line)
Speaker load impedance: 4Ω to 16Ω
Video Connections: composite
Dimensions: 430 x 105 x 345mm
Weight: 8.6kg
Repair:
8 replacement capacitors
4 replacement transistors
2 replacement resistors
soldered circuit
#10
A classic, no-frills power amp like this is all about value versus condition. At US$299, it’s a touch above the commonly seen used range for a serviced or dealer-offered Stereo 120/120A, which often lands around US$239 to US$299, so I’d call this fair-to-slightly-ambitious rather than a bargain.
The upside is real: these Dynacos are respected for simple, muscular 60-watt-per-channel sound and easy pairing with a separate preamp. If the included cables/accessories are genuinely useful and the amp is clean, tested, and quiet, that adds some value. The main thing to verify is basic health—no hum, no crackling, no overheating history, and no evidence of prior repairs done poorly.
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.
