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Flextone II effects loop hum

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I've owned (and gigged regularly with) an old Flextone II XL for years, and it still sounds great.

I recently bought a TC Flashback delay to insert in the effects loop, and it creates a bad 60hz hum. It sounds like a ground loop, but there is no way to get rid of it. The pedal is isolated from the AC mains, and I've tried ground lifts, different cables, etc. It even does it with just a patch cable plugged between the effects loop in/out jacks.

There is no hum or issues at all with the amp, other than when I plug something into the effects loop.

Is it possible that something has come loose on the effects loop connections in the amp, or was this always a problem? How can I fix this?

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