Ok now I REALLY have a Project!! A long time very good friend donated a once working 4CX250 amp with PS right around Christmas!! What a WONDERFUL GIFT!!! Here are the initial pix and the Matching Power Supply I was just TICKLED and loaded it in the back of the SUPERFLEX, I got the amp in the house and upstairs, but the PS would remain there until SUE AF6LJ came over and unloaded it. This is ridiculously heavy! making a SB-220 look like a FEATHER!!! As we can see, it is a PLUMBERS DELIGHT from the 1972 ARRL VHF Manual. the blower mounts on the side plate which is a problem for mounting in a cabinet So once Sue got the PS out of the SUV, we cut the wires and removed the transformer so that the 2 could be moved upstairs to work on. Previously, the Test room was shared with the radio shack, but that proved to be usless as all the junk was piled up blocking the test equipment. Now it is all upstairs neat and ready to work with. So after visually inspecting all this, here is what I have found: 1) Built by an unknown person sometime maybe in the 70s or 80s. IT worked until the screen supply burned up and a repair was made that was unsuccesful 2) Power Supply is a full wave bridge with 6 MONSTER 2100uf at 400VDC caps!! 3) I have a WHOLE BOX FULL of 4CX250Bs, but this uses 4CX250Fs which are 26V Fillaments!! 4) Of course now it has become a CAT RANCH ELECTRONICS project and QRZed knows all too well what that means!!