ebay - HP DSP600, is a 12-13.2v 47A, switching power supply once used in hp servers. They sell for about $10. I am using several of them. My 6600 is powered by one since I got it last year. I use another to power 2 100W HF radios (generator) during Field Day. Another is on my packet station, 24/7 365. Another is running all my ham shack accessories. Another to charge R/C Plane batteries, etc.