Hi Gary,
It depends on what you plan on working on. If you are going to stick to antique radios (115 volt variety) then the 5 amp will be fine. If you plan on doing car radios, 6 volt and 12 volt, then you might need more than 5 amps. I have a 6-12 volt Eico power supply here and some of the solenoids in 6 volt car radios need a lot of current to engage. Just my 2 cents
Tony
