Dynaco ST-35 Tube Amplifier Rebuilt with EFB Power Supply & Boards

Fully restored Dynaco ST-35 tube amplifier rebuilt with Dave Gillespie's Enhanced Fixed Biased (EFB) Power Supply Circuit Boards and output boards. The amp is in very good cosmetic condition and comes with the original brown Dynaco tube cage. This amp also has the original and best sounding early Z565 output transformers. A truly exceptional amplifier, known as the the Baby Dynaco, the ST-35 is the rarest of Dynaco tube amps and is very difficult to find these days. Its loved by vintage audio enthusiasts because of the fantastic sound it produces -- 17 1/2 watts per channel of pure tube magic. The ST-35 became famous for its fantastic iron. The output transformers are the famous Z565. Many believe this iron was the very best that Dynaco ever produced, even better than the A 470 (454326) transformers in the Dynaco ST-70. Like the output transformers in the ST-70, the ST-35 output transformers are also ultralinear. This means part of the primary winding on the output transformers is taped to the EL84 output tubes. The output transformers have taps at 8 ohms and 16 ohms. Considering the ST-35’s small size, it is amazing the sound that this amp can produce. The power tubes included are a matched quad set of JJ EL-84 tubes. Also, please note that the tube cage cover does not attach to the amp with screws it just fits in place for easy removal and access to the tubes. Details of the Dave Gillespie Enhanced Fixed Bias Power Supply Boards: Dave Gillespie’s EFB bias modification from cathode bias to Enhanced Fixed Bias is the first “true” circuit modification to provide genuine, measurable improved performance results in the ST-35. There is a “sound” difference between Dynaco's stock cathode bias output, and Dave Gillespie’s EFB bias. The improvement is measurable on the bench as increased power output and reduced distortion. But, the effect on the final sound is obvious in improved bass as would be expected, but also the modification improves transient response and provides superior “musicality” overall. Benefits of EFB include: Increased output power (both channels driven) Lower distortion Lower bias current for extended tube life