JLG

All sorted now. Was the fuse. Whoever put 2 different fuses in was obviously mistaken. Thanks for the advice. It's very much appreciated.

There are 2 fuses in mine: one T4AL 250v (which has blown) and one T8AL 250v The back panel says for 230v AC input it should be T4AL 250v, and for 15v AC input it should be T8AL 250v. I'm in the UK (just to clarify) on 230v AC so am I right in assuming it should be two T4AL 250v fuses? If not, what should it be? Again, thanks in advance. All this help and advice is very helpful.

Really? So can I swap them over? If so, why are there 2 different fuses?

I'm completely useless at the electronic side of stuff.

Hi all I was in rehearsal for 5 hours y'day and all was well. Took my gear home - Hartke HA3500 through a 115 Hartke cab - and switched it on this morning but there was no power. I checked the fuses (in the compartment above the kettle lead) and of the 2 fuses, the T4AL 250v fuse has blown (the other fuse is T8AL and is fine). Any idea what might have caused it? Is this any indication of another issue? I have replacements on order (I couldn't find a store nearby that stocked them). Thanks in advance.