On the topic of the Sencore's...
I have a Sencore CR70 in my rejuvenator collection as well, and correct me if I'm wrong (since I've never actually USED it), but Sencore uses a series of universal-style adapters, and not CR or CA style. In addition, there is a truly "Universal Adapter" (named as such) that was included/optional on the CR70. I just looked up a Sanyo EZ20 (B&K socket CR23) in the Sencore book and it lists the 510UTB22 tube as a #3 adapter, which most (if not all) of us should already have in our Sencore lids, as they were included at the factory, along with the other double-sided, double-numbered adapters.
Basically I'm saying if you own a Sencore, and it has the stock adapters in the lid, I don't believe you need any further adapters.