I have a US Navy "Plate and Filament Transformer" Manufactured by Hudson American Corporation. This monster weighs 14.5lbs, and is in a sealed steel casing. My output trans weighs 15.5lb as well. There are 16 unlabeled terminals, and I'm working to identify those. Suggestions on how to go about this efficiently? I've already taken resistance measurements between all terminals using a 16x16 table to record results It does however have the current and voltage labelings for the primary and secondary Primary : 110/115/120v AC Secondary 1:360-0-360 200MA DC Secondary 2: 6.6v 10A CT Secondary 3: 12.6V 3A Secondary 4: 5.25V 3A I'm set on using a solid state rectifier circuit so i don't need the 5.25V Line, or the 12.6V line. Could I somehow do something to get extra current on the HV line (S1 windings) with these unused secondaries? I want 4x 6550/kt88, so the extra plate current would be great to have around. 260ma plate idle to 520ma at 100% load (at 450V I think with screen and preamp tubes current draw) 6550 will handle plate voltage of 800v max Bias of 60-70% would be fantastic In order to squeeze more current out of the HT (HV) windings, I was told to wire the unused secondaries (12.6v and 5.25V) in series with the Primary, and use the 110V winding with my 120V mains. This increases the heat, but I've got fans (or an oil cooler, b/c I'm crazy) ready to combat this. How to I wire the unused lines with the primary? This is based around a choke input supply with a 12lb Stancor Swinging Choke. As far as the remaining PSU stages go, I was told to find a suitable "Swinging Choke" and couple it with a full wave bridge rectifier (rated atleast 1kv, .4a) and a pair of 100uf 450+VDC caps after the choke. I was also told to use 220k ohm 2+W resistors to divide the voltage between the series-wired filter caps as evenly as possibly I was told this would give me 650V and 300ma on the HT line with solid ripple reduction. Is this true? Now, I found a 12Lb 40's Stancor swinging choke, 3-17Henry, 120ohm DCR, 5000VDC and rated for 400ma for just $50, so I snagged that. I'm going to try and grab a few more electrolytic caps, as the ones i had were motor run caps, 40uf and 450VAC (600vDC), so i'll need more. My diodes are 12 1kv 1A 1n4007 diodes, and I'm wiring them three to a series for the bridge rectifier to be extra durable. Will all of this nonsense work?