Most MF/HF Amps are designed to work into a 50 ohm load... so you're looking at a 4kW device to give you the voltage you want.
40mA 450V at 1MHz is still 20W of anybody's money... easilly doable with a single 807 or 6146 valve... but the plate Transformer will set you back $100-$200.
Look on eBay for old Heathkit AM Ham HF Transmitters (from memory they all had American Indian native names I think). Nobody plays with AM anymore since they discovered SSB goes further. Those old 'Boat-Anchors' go for a song... and are a goldmine of parts you just can't buy anymore.
Oh... if you achieve it with a square-wave input, let me know... I want to set a stop watch to see how long it takes for the FCC (or NZ's equivallent) to break-down your door...
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