Hi all, long time lurker first time poster. I have a Ampeg Portaflex PF500 head conundrum I am hoping for insight on. I have been running a PF500 head either into a PF115HE 450W cab or into a SVT-410HLF. I have two PF500 heads, one screwed to the fliptop of the PF115HE, and the other was portable. I purchased both used around 2020, and both have worked great until out of the blue the fliptop mounted head crapped out during band practice last week. When turned on that head will give a brief...

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