Description

The Dynaco ST-70 Series 3 delivers the very soul of high fidelity. The ST-70 Series 3 tube amplifier is 35 watts-per-channel and switchable between both 4 and 8 Ohm outputs. It uses 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 Stereo 70 amplifier, with contemporary design techniques resulting in exceptional performance improvements that meet the requirements of modern audiophiles. The redesigned front end of the Series 3 amplifier replaces the obsolete 7199 pentode signal tubes from the original Stereo 70 with more commonly-used 12AU7 dual-triode tubes as part of a configuration that harkens back to the classic Williamson amplifier. This in itself has a long-storied history in the audiophile community. The output stage and EL34/6CA7 output tubes retain the same elements as the original Stereo 70 yet with the new design, the bias adjustment for the output tubes can be individually set using a front-panel recessed trimmer for each tube. After a warm up period (and with no input signal present), the bias is easily set by matching the brightness of the front-panel LEDs. Tremendous effort was applied to improving upon the original output transformers in an effort to increase damping and tighten up the low frequency response. A rear-panel switch allows the listener to select between 4 and 8-Ohm speaker loads. The feedback location is also configured by this switch, and the gain is adjusted accordingly.

Dynaco ST-70 Series 3 Tube Power Amplifier

Current Price

$1 500

Average

$1 500

Min Price

$1 500

Max Price

$1 500

Description

The Dynaco ST-70 Series 3 delivers the very soul of high fidelity. The ST-70 Series 3 tube amplifier is 35 watts-per-channel and switchable between both 4 and 8 Ohm outputs. It uses 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 Stereo 70 amplifier, with contemporary design techniques resulting in exceptional performance improvements that meet the requirements of modern audiophiles. The redesigned front end of the Series 3 amplifier replaces the obsolete 7199 pentode signal tubes from the original Stereo 70 with more commonly-used 12AU7 dual-triode tubes as part of a configuration that harkens back to the classic Williamson amplifier. This in itself has a long-storied history in the audiophile community. The output stage and EL34/6CA7 output tubes retain the same elements as the original Stereo 70 yet with the new design, the bias adjustment for the output tubes can be individually set using a front-panel recessed trimmer for each tube. After a warm up period (and with no input signal present), the bias is easily set by matching the brightness of the front-panel LEDs. Tremendous effort was applied to improving upon the original output transformers in an effort to increase damping and tighten up the low frequency response. A rear-panel switch allows the listener to select between 4 and 8-Ohm speaker loads. The feedback location is also configured by this switch, and the gain is adjusted accordingly.

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