So it turns out that my vintage Powertap CPU is, in fact, not compatible with the current generation of USB cradles. Some wrangling with Saris later, I'm having a yellow CPU shipped which is, the customer service rep swears up and down, compatible with both my existing Powertap Classic hub, and the USB cradle I purchased.
The current CPU works just fine, now that I've figured out interval mode ... did my LTHR testing on it last week, 238W/242W for 2x20' intervals, which puts a rough estimate at 230W (woo, just north of 3.0 W/kg). Of course, this is mildly inaccurate, but close enough to train on for now.
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