They are still around; http://www.linearpower.com. Unfortunately the stopped making the 3.2HV...so all they are down to is the 2.2HV for the TO3 series. But, TIPS has some mods to beef up those 2.2HVs
Still excellent, excellent amps. Void of crossovers and such, just straight gain blocks (which IMO is the way more amps should be)