Silvertone battery radio + battery eliminator

[radiotvnut]

There is one thing that's a little annoying with this Electro power supply. When connected to this Silvertone radio, there is a little 120 cycle hum and I can hear some slight oscillation when I tune off a station.

I have a Perma-Power eliminator and the problem is not there when I use that one.

On the electro unit, I've tried bridging electrolytic caps as well as clipping in a .01 uf cap across the various outputs and nothing helps. The only thing I have not done is remove the .047 uf "across the line" cap. Like I said earlier, the filament supply uses a transformer and is isolated. The B+ supply is rectified directly from the AC line.

On the perma-power unit, both filament and B+ supplies are derived from a power transformer and are isolated from the power line. There is also no AC line cap in this unit.