EH-16 second power supply strangeness

[Jaroslav Lukesh]

> 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.

Try to test rectifier diode bridge, but I still think that it should be a
filter cond. Or burned ceramic cap (if they present at PS).
Have no more ideas.

Jerry LSH