I ran a query with variations of the titled words, but came up with no previous threads. Consequently, I'm coming to the well of knowledge. I have an Acom 1500 amplifier, which uses the 4cx1000 ceramic tetrode. Is it possible to swap it out with the 4cx1500? Both seem to have some similar specs, and I'm having trouble finding a 4cx1000 tube that's not some burned-up thing or a Chinese piece of junk. I seem to run across more of the 4cx1500 tubes on the market. If it is possible to do a swap, do you have an idea of what else needs to be changed? I can't image that it would be a simple matter of just plug-n-play, although that would be nice. Plus, would there be additional benefits to running the 1500 over the 1000, other than availability? Any direction is appreciated!!!