If, you ever need to repair an Astron power supply or desire to build your own - here is a good article and some good references: David Metz's, WA0AUQ Article "What's inside your Astron" http://www.seits.org/features/pwrsup.htm Astron schematics and info http://www.repeater-builder.com/rbtip/astron-index.html Power Supply kits http://www.electronickits.com/kit/complete/powe/powe.htm Greg w9gb