The AVA enhanced pure vacuum tube amplifier for your original Dyna ST-70 chassis.
Over the years, we have received may requests asking for service and upgrade help with the long-out-of-production Dynaco ST-70 vacuum tube power amplifier. The Ultimate 70 is a AVA circuit set for the Dyna ST-70 chassis that goes far beyond the original Dynaco design.
The audio circuit has been carefully engineered for the widest controlled bandwidth and stability under all conditions. We think you will love the Ultimate 70 as it is just simply lovely sounding. It takes every last bit of grain away from your records and CDs, but takes nothing else away at all. The highs just float. Transparency, detail, definition, range, and dynamics are wonderful. It's got a mid range to die for and bass extension and control you would not believe possible at this power and price. The sound stage is huge, the depth is pure reality, and the emotion of the music is all there, like you have never heard before.
Rebuild kit plans
If you would like to build the Ultimate 70 rebuild kit but are not sure of what is involved, we will provide the construction plans free of charge via a PDF file upon request. The plan includes parts lists, wiring layouts, step-by-step instructions, and all of the general advice and wiring guidelines. You can learn what tools and skills are required, the complexity of the project, and the thoroughness of our guidance.