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Hey Andy have you got a picture of those supplies? I have some Heath 400v supplies but can't remember the model number. They have a hand wired chassis, 6L6's and OA2's plus a 6X4 and some other tubes, and a green power indicator light in the middle.
Probably the 6L6's are the best device suited to that job...unless there are some transistors (power mosfets maybe) that can pass 400 v at 150 ma. I don't know if these exist or not.
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