My 2 meter Amplifier is an M2 1K2 SSPA.

The Amp Requires 50V at 40A to make a KW output. The typical solution is to use an HP Server power supply which can be picked up on EBAY for $30.

The HP server power supplies work well, but have high fan noise, and are pretty bad EMI generators. You must take extra measures to reduce the EMI emissions. On EME, even one or two dB of extra noise is not acceptable. The best solution would be to mount everything in a metal cabinet. I have a nice wood shop, so I built a wooden roll-around box and lined it with radiant barrier material. This worked great, but xyl complained that it was ugly.

I was browsing EBAY and ran across a seller who has a bunch of Kepco/TDK RKW 15-22K power supplies. I bought six of them for $37 each.

The RKW 15-22K is adjustable from 10 to 18V and delivers 22A. These power supplies are designed to be run in parallel with provisions for master/slave and current balance. So with a pair you have 44A. If you put three pairs of these in series you have 53V at 44A. Viola!!!

These Kepco RKW power supplies are extremely well made and meet the very strict EU emissions requirements. No noise emissions from the new power supplies for the SSPA.