With so many people expressing concerns about 811A tubes, melted plates, poor dissipation, etc., etc. I decided it would be a good idea to open up the AL-811H that I bought last summer and see how they looked after a year of casual use. I typically tune up at 600 watts CW using W8JI's recommended method, then reduce power and aim for 500-600 watts PEP on the meter. I don't see any benefit to pushing for 800 watts. My amplifier operation is 95% SSB, since I usually do CW operation at 50 - 100 watts. I have begun dipping my toe into the contest pool, scoring high enough in several state QSO parties to get a certificate. In our home Vermont QSO party, I worked over 500 contacts, nearly all done using this amp at 500+ watts over a period of many hours, and frequently calling CQ. When I opened the amp, the tubes looked as though they had come from the factory. I could not see any trace of melting, no welts, no black deposits, no indication of any damage. I didn't remove them from their sockets, so I couldn't see every part of the tube, but I would have expected some indications if they had suffered from use. The amp still puts out 600 W at tuneup, and 500-600 watts SSB PEP with about 40 - 50 watts drive depending on the band. IMHO, concerns about these tubes are overblown. They can perform very well and will be very cheap to replace when they fail.