The HM Strat has two TBX tone controls, if yours has them you will notice a detent at 5 on the tone. They are stacked pots, 0-5 operates like a regular 250k tone control, after the detent they go all the way to 1 meg I believe.
I recently had a problem with the one fitted to my Strat, but discovered that the wiring for a TBX is different to a regular Strat. I've noticed as well that the TBX system has been refined several times over the years, I have three different versions on my guitars, but they all do the same thing.