I expect Doge10 had supply chain issues for their components or possibly even infringed on some design patent from another company.
Who knows but Thomas is in Canada and seems keen on addressing customer concerns so for those of you who wish please support his start up business.
For me personally and for some feedback, I do not like lots of bells and whistles with tube gear. Keep it simple. That is why I do not buy PrimaLuna with the auto bias. I have seen a similar circuit go haywire in a tube guitar amp and bake the power tubes (Carol Ann Amps).
My flavor of the month is Icon Audio. Yes they have been around for a while and UK based. Really enjoying the 300B and Stereo 40 models. Highly resolving tube amps with simple reliable operation.