OT: EH-16 second power supply strangeness

[Grant Richter]

My Electro-Harmonix 16 second delay (which I use with the spacerock band)
recently quit working. The symptoms were it put out white noise at low line
voltage.

So I went through and replaced all the electrolytic capacitors.
That fixed it mostly, but in the process, I put it on a Variac
and tried different line voltage levels.

Low and behold, there was a slight 60Hz intermodulation tone,
at any input voltage below about 130 VAC. I realized in retrospect
that the thing had NEVER been clean, some 60 Hz always bled
through.

Has anyone else got one out there that can confirm this?
Perhaps the transformer has gone bad, but I have never
heard of a transformer "fading", they usually just go dead.

Thanks

Grant