David Hafler released the Dynaco ST-35 two-channel power tube amplifier nearly 50 years ago as a lower cost alternative to the popular ST-70. Ignored for years by many tube enthusiasts, due to modest power output, it’s become a hot item since the start of the new millennium, with new releases of complete amplifiers, clone boards, transformers, tubes and other parts. This complete revision of an original illustrates various techniques to bring this diminutive classic to it’s full potential.
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