I'm confused... I have built a few 5F6A's as well as some others. I currently have my own and the one I'm working on. I just finished the new one, but it immediately blew one or two of my speakers. I had it plugged into my old 5F6A cabinet (Two WGS Vet 10's(20watt) and two Weber CTC10's(25watt)) to test it out after completion. Light bulb limiter went well, voltages look great. Sounded good so I turned it up, as you do. Speakers blow. Not sure which one(or more) yet... . This cabinet sounds great with other 5F6A chassis or heads... so I'm not sure what happened. So I plugged the chassis into a hot rod deluxe cabinet (same output power as a 5F6A). I turned it up slowly. And before you can even get to any type of overdrive, it starts pushing the speaker too hard ... so I stopped. Any ideas?