FWIW the wording of the warranty is:
Quote:[The warranty] covers any defects materials or workmanship and
includes both parts and labor. Shipping is not covered. Damage to the amplifier from
improper use, incorrect fuse size, shorted tubes or the wrong tubes will not be
covered.
So the way I read it is if your amp fails because something goes wrong with your STR you aren't covered, just as you wouldn't be covered if something goes wrong with your conventional rectifier, or other tubes. If you are using the STR and the amp fails for an unrelated reason then you are covered. But, as a practical matter it is hard for me to imagine a rectifier related failure, STR or conventional, that does anything more than blow a fuse, or two. But JMO/FWIW and all that. I’m not using mine in a Decware amp.