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ST70 Series 3

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The Dynaco ST-70 Series 3 tube amplifier is 35 watts per channel and switchable between both 4 and 8 Ohm outputs, with Class-A push-pull stereo topography, that has long been characterized as a robust, reliable design of exceptional value.

The ST-70 Series 3 builds upon the proven design philosophies of the original David Hafler-designed Stereo 70, with contemporary design techniques resulting in exceptional performance improvements that meet the requirements of modern audiophiles.

Dynaco engineers have made extensive use of high-quality parts that were unavailable at the time of the original design including precision metal-film resistors, poly-composition capacitors, and miniaturized high-capacity power supply electrolytic capacitors. In addition, many of the newer parts are also built to tighter specifications than the originals.


Circuit Class AB Quad-triode design
Inputs RCA (left/right)
Outputs 5-way gold binding posts (left/right)
Power Output 35 watts/channel into 4 or 8 Ohms
Features User-adjustable bias, selectable high-pass filter
Tubes L34/6CA7 output tubes for classic Hafler Ultra-linear response
Impedance Selectable 4 Ohm and 8 Ohm speaker loads
Max Power Consumption 345 watts
Dimensions 17″ × 9.25″ × 7.5″ (431 × 235 × 190 mm)
Power 110V/230V
Warranty 3 year, transferable

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