I just bought a dummy load that is rated 200 Watts continuos. I want to be able to tune up my linear which would be 1Kw for about 20 seconds. From looking at other dummy load curves it would seem that even 10 minutes at a KW probably would be OK. I know I will never take more than a minute to get it tuned up. What can I expect for intermittent use at 1 kw?