Where is the AC fuse located on the SLI-80

In amps with one fuse it should be located close to the incoming power and before the power transformer. So look for the IEC, follow the wires...

The pdf manual I found didn't say anything about removing a bottom cover. Sometimes the fuse is incorporated into the IEC. Look real close at the IEC (from the outside) there's a version with a tiny slot, small flat blade screwdriver just fits, pull it out.

Its one or the other. Should be able to find it. It is a tube amp, after all.

Look for a pop out panel on the IEC connector (they are usually located on the back/outside).

DeKay

Oh my.... good call. I would have never found it. At my age I needed a magnifying glass to see the darn thing.  THANK YOU very much.

If I may ask another question: Is it a good move to get a UPS to "protect" the amp from spikes and brown-outs? We live in Florida with lots and lots of lightning activity.

Regards,
Richard

If you get hit by lightning, good luck with the UPS.