I recently got my hands on a real nice amp, a Hammarlund HXL-One from a SK sellout. (Its layout is somewhat a basically simplified version of a Heathkit SB200.) The problem was that it was in a terrible state when I got it. The big fat bleeder was broken, the HV diodes gone in smoke, a cable to the neutralization varicap had almost welded it self to a nearby edge and the psu caps was long gone dry and some of the resistors over the caps was way of. Since the former owner never mentioned what had happened and is not around anymore I had to suspect a lightning strike thru the mains where there also was a black welding spot on the casing near the incoming chokes. All in all I had some fixing to do. Ok, a lot of hours later and all faults fixed (I hope) I fired it up and lo and behold it worked without fires! But the output was not very good, at all. Here is where my question for help comes in. With 1900 volts it topped 400w with 100w input at 80m and then dropped to ~175w out at best on 10m. This with a Heathkit 1kW Cantenna attached to it. (No Bird meter to measure with unfortunately, just two regular cross needle meters, one for max 1kW and another for max 3kW. Booth shows reliable at 200w as far I know.) I have measured every component, cleaned all contacts and switches and checked the gear that goes in or out to this one but no luck. Made a neutralization that pushed about 10w more out of it but that was it. Soft tubes? Check! Bought a used but tested and good pair of Cetron and did the whole soft start / burn in procedure. Now I get 400w 80m thru 10m even though 10m really makes the tubes go red in a jiffy at 10 and 15m. Why can't I get the 572b's to max out on 6-700w with 100w in? They has been tested in another amp before and gave 700w out. As of what I have read for the Hammarlunds cousins a pair of 572b's should at least do 500w out, that with about 65~85w in, I did 100w. Noticed: The plate voltage drops from 1900 volts to 1600volts at load. I guess this might be one thing? (Though I have read about those that get's out 600w at that.) At 15 and 10m it is easy to run over the 550mA max grid current specified but not on 80 to 20m. My future plan is to run this amp on 4-450w out when needed, otherwise I like go "barefoot" but I want this amp to run well and not have to brute force it cherry red to get those watts out of it. Any ideas or usage tips are welcome!