Got this response from Pass today via email
If you are using an aftermarket fuse on the INT-60 I would choose 6A slow blow (time delay) for 120Vac service and 3A slow blow (time delay) for 240Vac service. Sorry, I don't know where you are or what market. Check the voltage requirement on the back of the amp vs you supplied line voltage
Check the fuse size. Very early INT-60's we built with the North American standard (UL rated )1/4" x 1-1/4" glass fuse. Latest production builds use the European (CE rated) fuse which is 5mm x 20mm in size.
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