This morning I went to the local flea market looking for a antenna to use on a project. Had I not been looking, there would have been 10 for sale,,, but alas there were none. However, I stumbled upon an Astron RS-20a that was missing the cord. Asked the seller how much and his first response was "what is it?",,, that was a good sign. After I told him it was a power supply he responded "what about $5?". I'm not gonna lie,,, I tried for $3 since I couldn't test it,, but he dug in at $5. So I got it home, dug out a cord and plugged it in and heard the hum,,,, VOM says 13.8V,,,,,, cool! I haven't load tested it yet, but you can't beat a 20 amp supply for $5.00!!