I have owned a Heathkit SB200 for about 13 or 14 years. The manual says it should do 1000 watts on CW. I have had a friend tell me that his SB200 performed as advertised. My wattmeter has never shown more than 650 watts. I notice Ameritron builds an amp with 4 572Bs....and they claim 1350 watts. Does anyone have an SB200 that really does a KW?