I picked this up awhile back and I'm just testing it. I'm only getting about 350 watts out with 80 watts drive on 80m,and progressively less as I go up in frequency. The plate voltage is right but I am not getting a very pronounced dip in plate current. I'm thinking tubes are bad, seems that everything out there is Chinese or used. Any tips? RF Parts only has Cetrons, I assume nos, but $200 each, I can order matched pairs of Shanguan tubes for about $120 or DX Engineering label for about 180 a pair.