It's lower for AM service than for SSB. A friend ran a 2uF filter in a 7000V power supply for a 4-1000A running SSB. It sounded hum-free. >What is an acceptable ripple voltage in an amplifier's >power supply? > >I've been told anywhere from 10 to 3 percent???? >73, >Bill > >===== >Bill Smith KO4NR - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end