It seems we need to start compiling experiences with Class D powered amp heads going into Protect Mode or experiencing brownouts on the gig. Ground Rules 1. ABSOLUTELY NO CLASS D BASHING FROM AB OR TUBE USERS. You’ve been asked NOT to do it. If you comment along those lines, I will report to the mods. 2. Experiences on the gig at normal gig volumes. 3. Please list the head, estimate of dB level you were at, approximate stage temperature, and how often it happened. 4. Also, which heads have given you no problems of this sort. My experiences so far are that this is extremely infrequent, and only seems to happen with the Class D micro heads. I’ve never had the behavior with a Class D power amp; so, seems to be the Class D micro modules. It is so infrequent, it’s tempting to ignore it. Yet, when it happens, it can be like the floor suddenly fell out from under you. That’s not acceptable. Here are my experiences. Shuttle 6.0, normal 75F stage temp, probably 105 -110 dB’s, happened twice. I just stopped using that head for higher volume gigs. IIRC, the protect mode was intentionally set low in this head. Demeter VTBP-201 with internal 250ASX2, 105F outside gig, probably 110 dB. Only happened that once. Gigged that head regularly for another two years + with no problems whatsoever. Still use it. Just have lingering lack of confidence. Heads with zero issues: GB Shuttle 9.0, tons of gigs GB Shuttle 12.0, numerous gigs Bergantino B|Amp, numerous gigs. The Class D micros offer a lot of promise for players happy with the voicings; but, this kind of behavior in the middle of a tune is unacceptable. So, please share your experiences +/-. Only way I can see whether we are looking at design issues or something fundamental to the modules being used. Apologies to the fine amp makers, who are working hard to improve things for us.