Hello I picked up an linear amplifier minus power supply at a hamfest for under $100. The owner said he hasn't used it in 10 years and is downsizing. He had already powered it up the night before and it worked fine. My club members told me he had a good reputation for the boat anchors he sold. The linear amp has 4 (4-250) tubes for output. An Elmer at my radio club told me it would provide 3kw easily with a 3.5kv power supply. He also told me each tube will draw 10 amps from the filament supply. Since the tubes are in parallel, could I simply remove 2 tubes and run it at 1.6kv? Another option, can I replace the 4-250 tubes with 4-100's and run 1.6kv? Is there any way to test the 4 tubes I have? Please help this lost soul out.