cbkidd1,
I'm sure that Clipperton is in better shape than it used to be, but still, don't expect a large increase in output power even with those modifications. The tubes are still 572's, that hasn't changed, and they are still the limiting factor. A much better solution for higher output power, especially for AM, and this particular amplifier, is to make a very large increase in the air movement and cooling. One aspect of using a larger than 'normal' transformer in any amplifier is that they typically decrease the amplifier's cooling capacity because of the transformer's larger size. Constricted space means less air movement, means less cooling. That extra cooling isn't really that hard to do, but the 'catch' is noise. There will be noise, not just from the fan, but from the air movement it's self. That's one of the 'gotcha's with any amplifier, not just the Clipperton, and not just for tube type amplifiers, but all of them!
Another 'gotcha' for any amplifier as old as the Clipperton is how power was calculated. It was rated by input power, not output power, huge difference, as in about 50% actual difference in output power.
Nothing wrong with rating things by input rather than output power, as long as the user/buyer is aware of it. Same road, just a difference view.
- 'Doc