This is a used tube-type regulated supply for powering over 250 types of small klystron tubes. Puts out -250 to -400 beam volts and 0 to -900 reflector volts. Also has internal and external modulation. Unit has been repaired and checked ( all bad and leaky paper caps replaced with mylar ) and is complete with the exception of a missing handle. Shipping wt 24 lbs. Email me if you need pics or info. I can also include a schematic. Email or call 334 347-5281.