Hello,
The UltraValve used the same transformers as the Dynaco 70. All the transformers were new construction based on the original Dyanco windings (not old stock transformers), with the power transformer being considerably beefier than the original Dynaco. When the general part shortage happened our transformer source was not able to source materials needed to manufacturer transformers at a reasonable cost. Some sources for new Dynaco transformers are again showing stock, but the prices are considerably higher than what we were paying. In addition, the custom Ultimate 70 stainless steel chassis would also be considerably higher cost. Finally, the tubes used in the amp have also seen a significant increase in cost. The result is that if we did bring the UtraValve back to the market the price would be much more expensive, likely close to, or more than, double the original cost.
We have looked at creating a new tube amplifier based on available non-Dynaco design transformers, but even that route will result in a tube amp that is significantly more expensive than what the UltraValve was. It's a shame that we had to discontinue the UltraValve. Being the person who built the UltraValves, it's one of my favorite AVA amps.
Larry
