2psyop,
Fair point for the Tempest...appr. 15 years back...we have had some serious hum issues with 2 different manufacturer in about half of the units out there back then, that is correct. That's also when I scrapped the regular Tempest and only offered the Extreme , which had the Symphonic Line boards with their proprietary caps and the massive myMetal transformers...problems solved.
AND, never ever did we have systemic problems with the amps.....that would be a lie...